Figure 2. Bored boulders with Spirolites radwanskii n. igen. n. isp. (1, 3, 4) INGUJ214P/SZG1; (2, 5, 6) INGUJ214P/SZG2. (1, 2) Views of the upper surfaces of the boulders; (3) holotype of S. radwanskii n. isp.; (4–6) paratypes. S=Spirolites radwanskii n. igen. n. isp., Gc=Gastrochaenolites cf. G. cluniformis, Go=Gastrochaenolites ?orbicularis, Gt=Gastrochaenolites torpedo.
Description.—Flask-shaped structure, circular in transverse section, with a distinct chamber and a neck. The chamber is up to 8mm wide. The whole trace is 27mm long.
Remarks.—Gastrochaenolites lapidicus is produced by the bivalves Lithophaga, Hiatella (Kelly and Bromley, 1984), Rocellaria (Gastrochaena) dubia Pennant, 1777 (Bromley and