46 Cincinnati Society of Natural Histoiy. 



The type specimen is from Newton. 'I'he sharp and well de- 

 fined depression along the carina of the umbonial slope is so 

 striking and seems to be so characteristic for the horizon, Newton- 

 Wautubbee-Lisbon, that some might consider it more practical to 

 give to the form a new specific name. This, however, would not 

 show its close relation to Corb. Munliisoni. 



Ncccra {Ca/'dioiiiya) /iiul/ionia/a, n. sp. 

 Plate II. Figure 19. 



Posterior half of the surface, with six radiating ribs, the 

 stronger the more posteriorly they are. They alternate with 

 smaller radiating ribs, which do not cover the umbonial i)art. 

 Anterior half of the surface covered by numerous radiating ribs ; 

 its umbonial part is covered by strong concentric ribs, which ter 

 minate abruptly at the first radiating rib of the posterior half. 



Wautubbee. 



Only the figured damaged specimen has been found. 



Xylophaga (?) iiiississij^piensis, n. sp. 

 Plate II. Figure 24. 



Globular, widely gaping in front. Divided by a radiating 

 line into two parts. The posterior ])art is convex and covered l)y 

 indistinct, distant concentric lines. The anterior part is globu- 

 larly rounded and covered by sharp, elevated, somewhat waving 

 concentric ribs, smaller and crowded on the umbonial ]>art. Its 

 anterior margin is reflected. 



Newton. 



One single s])ecimen has l)een found. 



LeI'ADID/F.. 



Sc(xIpcUiini siilujiiadrafiim, n. sp. 

 Plate II. Figure 25. 



Carina only known. Its umbo at the apex, pointed. Tectum 

 and parietes flat. 



Wautubbee. 



Resembles very much ScalpcUuni (juadraiinii, l^ixon, sp. (C. 

 Darwin, Fossil Lepadida:\ j). 22, pi. I , fig. 3.), from the English 

 Eocene. 



