Bergeron’s slab (Fig. 1) as syntypes and illustrated nearly all of them photographically. They selected one cranidium (Figs. 1.5, 2.5, 2.6) as the lectotype of A. chauveaui and regarded all other specimens except for a small cranidium (Figs. 1.7, 2.9) on the slab (Figs. 1.1–1.4, 1.6, 1.8, 2.4, 2.7, 2.8, 2.11, 2.12) as para- lectotypes. The specimen selected by Lane et al. (1988) as the
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lectotype is not the specimen originally illustrated as a line drawing by Bergeron (1899, fig. 9; reproduced here as Fig. 2.1). Restudy of the material on Bergeron’s slab shows that
three species are present, each referable to a separate genus (Figs. 1, 2). The exoskeleton and only specimen illustrated by Bergeron (1899, fig. 9; Fig. 2.1) can be inferred to be the
