EDMONDIA. 81 



and more swollen behind, and has more definite, divaricating ribs, and a distinct 

 anterior dorsal constriction. 



Sanguinolites mimus is longer, more regularly and coarsely ribbed, and has a 

 definitely depressed posterior slope. 



8phenotus Hichii, n. sp., is longer and less regularly oval, has a more 

 depressed back, a post-umbonal keel, and a depressed posterior slope. 



2. Edmondia ? Athen.^]:, n. sp. Plate IX, fig. 3. 



Description. — Shell very small, transversely oval, moderately convex. Umbo 

 small, low, proximate, situated at about the anterior third of the length. Anterior 

 margin apparently deeply convex. Inferior margin long, nearly straight. 

 Posterior margin deeply convex. Back transversely flattened. Surface with about 

 eight or ten strong, regular, elevated, rounded, concentric ridges, separated by 

 similar depressions. 



Size. — Height 5 mm., length 8 mm. 



Locality. — One specimen from Bradiford is in the Barnstaple Athenseum. 



BemarJcs. — The only specimen of this shell that I know is very poor, but it seems 

 to be distinguished from accompanying species by its transverse oval form, and its 

 very strong, sharpish, regular striee. On the same slab are several specimens of 

 Cypricardinia scalaris, but it does not seem possible that it could have afiinity 

 to that rather variable species. 



It approaches in shape, and agrees in ornament with, several of the numerous 

 Carboniferous species referred by de Koninck to this genus. 



It is so similar in general appearance to Sanguinolites Ungeri, F. A. Romer,^ 

 that for a long time I thought it belonged to that species ; but F. Eomer shows that 

 shell to be congeneric with his Venulites concentricits,^ and a Belgian specimen in the 

 Woodwardian Museum shows the latter species to be widely removed, and more 

 in the style of an Astarte. The shell given by Kayser * as Allorisma lingerie 

 F. A. Romer, sp., differs in having finer and much more numerous striations. 



1 1843, F. A. Eomer, ' Verst. Harzgeb.,' p. 26, pi. vi, figs. 26 a, b. 



2 1844, Ferd. Eomer, ' Ehein. Uebergangsgeb.,' p. 79, pi. ii, figs. 3 a — c. 



^ 1878, Kayser, ' Abhandl. Geol. Specialk. Preuss.,' Band ii, pt. 4, p. 118, pi. xx, fig. 7. 



