TRENTON LIMESTONE. 
183 
Genus C ARINAROPSIS. 
[Carinaria, and o-^ig ; from its resemblance to Carinaria.] 
Character. Symmetrical, subcortical, patelliform, subangulated or carinated on the dorsal 
line ; apex incurved or convolute ; aperture oval, narrowed posteriorly. 
There are two or three species of shells having the characters here given. They are 
usually associated in the rock with the Bellerophon bilohatus , and are rarely seen in any 
other situation. 
238. 1. C ARINAROPSIS GARIN AT A (n. sp.). 
Pn. XL. Figs. 1 a, b, c. 
Depressed conical; apex incurved ; aperture broadly expanded, with a narrow sinus in 
the posterior dorsal margin, from which a strong dorsal carina extends to the apex ; surface 
concentrically striated. 
This species is remarkable for the broadly expanded aperture and sudden contraction 
towards the apex, which is acutely pointed and incurved. 
Figs. 1 a, b. Lateral and dorsal views. 
Fig. 1 c. Lateral view of another specimen, showing a more elevated carina. 
Position and locality. In the dark compact limestone at Middleville and Trenton Falls, 
associated with the Bellerophon bilobatus. 
239. 2. CARINAROPSIS PATELLIFORMIS (n. sp.). 
Pl. XL. Figs. 2 a, b. 
Obliquely subconical, patelliform, the apex incurved and extended in a line with or 
beyond the margin, obtusely carinated upon the dorsal line ; aperture broadly oval, slightly 
narrowed posteriorly; surface marked by fine concentric sublamelliform striae. 
This species resembles in form the recent Capulus ; but the structure of the shell is quite 
different, being, in this respect, closely allied to the Bellerophon. There are one or two 
other species in the Hudson-river group, and a single more elevated one in the Trenton 
limestone, which has not been satisfactorily determined. 
Fig. 2 a. Dorsal view. Fig. 2 b. Lateral view of the same specimen. 
This one and the preceding species are arranged in this connection, both from similarity 
in the structure of the shell to Bellerophon , and from an analogy in the form of C. carinata. 
Position and locality. In the compact finegrained limestone, with the preceding species, 
at Middleville. 
