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1008


Journal of Paleontology 91(5):1001–1024


1941 Pseudodiadema diatretum; Cooke, p. 8. 1959 Echinopsis diatreta; Cooke, p. 14, pl. 2, figs. 8–11. 2000 ?Echinopsis diatreta; Smith and Jeffery, p. 128.


Type.—ANSP 1471, reported lost, from the Vincentown Formation, Gloucester, Camden County, New Jersey.


Description.—Small, tumid. Apical disk pentagonal. Ambulacra quadrigeminate at ambitus, phymosomatoid compounding, otherwise trigeminate. Single large perforate, crenulate tubercle per interambulacral plate. Peristome weakly notched, about one third of total diameter, no phyllodes.


Additional material.—No material attributable to this species was located.


Occurrence.—Vincentown Formation, Gloucester, Camden County, New Jersey (exact locality unknown).


Remarks.—Description is based on the original published description. Even though a number of otherwise small, indetermi- nate regular urchins have been collected from Paleocene deposits in the eastern United States, they cannot be attributed to this species.


Genus Micropsidia Pomel, 1869


Micropsidia salis (Cooke, 1941) Figures 5.1–5.3, 6


1941 Thylechinus (Gagaria) salis Cooke, p. 13, pl. 2, fig. 12–14. 1959 Gagaria salis; Cooke, p. 17, pl. 3, figs. 7–9. 1977 Gagaria sp. Toulmin, p. 178, pl. 9, fig. 8, 9. 1997 Gagaria? salis; Carter, p. 51. 2000 Micropsidia salis; Jagt, p. 245, pl. 9, figs. 12, 13, 15. 2000 Micropsidia salis; Smith and Jeffery, p. 126, text-fig. 51e–g.


Type.—USNM166497, from the Salt Mountain Limestone, Salt Mountain, Clarke County, Alabama.


Description.—Small, subhemispherical. Apical disk small, hemicyclic, one ocular (I) insert. Ambulacra trigeminate, lower plate dominant (echinoid style), narrow, about half as wide as interambulacra at ambitus. Single, relatively small imperforate, crenulate tubercle per interambulacral plate, each with four to six secondary tubercles adapically; one primary tubercle per compound ambulacral plate.


Additional material.—MMNS 5304.1, MMNS 5304.2, and MMNS5304.3, fromthe Clayton Formation (McBrydeMember), ResourceManagement Services Palmyra tract, Lowndes County, Alabama.


Occurrence.—Salt Mountain Limestone, Salt Mountain, Clarke County, Alabama (UTM Zone 16, E 417,423 m,N3,478,716 m, NAD83). Clayton Formation (McBryde Member), Resource Management Services Palmyra tract, west of State Highway 263, entrance 2 miles north of Butler-Lowndes County line, Lowndes County, Alabama (UTM Zone 16, E 525,183 m, N 3,539,105 m, NAD83).


Remarks.—Description is based on the original published descrip- tion. Cooke (1941, 1959) reported ocular I to be insert, confirmed by observation here, as shown by the drawing in Figure 6.


Order Phymosomatoida Mortensen, 1904 Family Phymosomatidae Pomel, 1883 Genus Gauthieria Lambert, 1888


Gauthieria speciosa (Clark, 1891) Figure 5.4–5.7


1891 Cyphosoma speciosum Clark, p. 76. 1893 Coptosoma speciosum; Clark, p. 52, pl. 18, figs. 1a–h. 1907 Pseudodiadema speciosum;Weller, p. 286, pl. 9, figs 7–14. 1915 Coptosoma speciosum; Clark in Clark and Twitchell, p. 61, pl. 19, figs. 3a–h.


1935 Gauthieria? speciosa; Mortensen, p. 474. 1941 Microsoma speciosa; Cooke, p. 12, pl. 3, figs. 1–4. 1959 Gauthieria speciosa; Cooke, p. 23, pl. 5, figs. 1–7. 2000 Gauthieria speciosa; Smith and Jeffery, p. 95.


Type.—ANSP 1468, from the Vincentown Formation, Timber Creek, New Jersey.


Description.—Small, circular, relatively flat, very slight invagi- nation of oral surface. Apical disk large, pronged posteriorly, details of apical disc unknown. Ambulacra about half as wide as interambulacra, pore pairs linear for most part, a little arcuate above the ambitus; quadrigeminate, phymosomatoid com- pounding, becoming trigeminate near apical disc. Peristome about a third of test diameter, circular, weakly notched. Primary tubercles imperforate, crenulate.


Additional material.—MMNS4434, from the Clayton Formation, below Ft. Gaines Dam, Ft. Gaines, Clay County, Georgia.


Occurrence.—Vincentown Formation, TimberCreek,Gloucester County, New Jersey (exact locality unknown). Rancocas Creek, Vincentown, Burlington County, New Jersey (UTM Zone 18, E 520,995 m,N4,421,446m,NAD83); Clayton Formation, banks of Chattahoochee River below Ft. Gaines Dam, Ft. Gaines, Clay County, Georgia (UTM Zone 16, E 684,113m, N 3,500,292m, NAD83).


Remarks.—Description is based on the original published description. The Georgia specimen differs from the New Jersey


Figure 5. Micropsidia salis (Cooke, 1941) from the Clayton Formation, Palmyra tract, Lowndes County, AL: (1) MMNS 5304.3, aboral; (2) MMNS 5304.3, detail of ambulacrum; (3) MMNS 5304.2, aboral. Gauthieria speciosa (Clark, 1891) from the Clayton Formation, Ft. Gaines, Clay County, GA; (4) MMNS 4434, aboral; (5) MMNS 4434, oral; (6) MMNS 4434, profile; (7) MMNS 4434, detail of ambulacrum. Arbaciella? sp. from the Clayton Formation, Starkville, Oktibbeha County, MS: (8) MMNS 7814, aboral; (9) MMNS 7814, oral; (10) MMNS 7814, detail of tags on peristome margin Scale bars are (1, 3, 8, 9) 5mm; (2, 7) 2mm; (4–6) 10mm; (10) 1mm.


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