PLATE 41. 
Fig. 1. 247. 2. CyYRTOLITES TRENTONENSIS. (Pag. 189.) 
1 a. Lower surface of an imperfect specimen. 16. A portion of the surface strie enlarged. 
1 ¢, Section of the shell below the aperture ; the upper surface of the figure being the dorsal margin. 
Fig. 2. 250. 1. CyRTocERAS LAMELLOSUM. (Pag. 193.) 
2a, Lateral view of the fragment. 2b. Dorsal view of the same. 2. Magnified portion of the surface. 
Fig. 3. 248. 3. CyRToLITES FILOSUM. {Pag. 190.) 
3 a. Lateral view of the specimen imbedded in stone, the apex being concealed. 
3 b. View of the dorsal side of a small portion of the shell, showing the arched striz. 
Fig. 4, 5. 251. 2. CyrrocERAs ANNULATUM. (Pag. 194.) 
4a. A large fragment (a cast), retaining the annulations. 
4b. A smaller fragment, retaining the shell and transverse striz- 
4c. Section of the last, showing the siphuncle. 
4d. A portion of the surface magnified. 
5. A fragment of the same species. nearer the aperture. 
Fig. 6, 7, 257. 1. ONcocERAS CONSTRICTUM. (Pag. 197.) 
6 a, View of the ventral side of an imperfect specimen. e 
6 6. Lateral view of the same, showing the sudden contraction below the outer chamber : aperture imperfect. 
6 ¢. Section of the lower extremity, showing the small dorsal siphuncle. 
6d, A smaller specimen, of the same form as the last. 
6 e. A shorter and more ventricose specimen. (The transverse lines on the upper half of the figure, indicating 
septa, are incorrect.) 
6 f. The apicial extremity of the fossil. 
7 a,c. Dorsal and lateral views of a fragment, showing the direction of the septa. 
7b, d. Sections of different specimens, showing the position of the siphuncle, and the narrowing of the dorsal 
side of the shell. 
