PLATE 59. 



Fig. 1, 2, 3. Endoceras troteiforme. (Pag. 216.) 



1 a, b. Var. tenuitextum. The surface markings on two different specimens, somewhat enlarged beyond the 



natural size. 



2 a, b. Var. tenuistriatum. Tlie surface markings on two different specimens, both sliglitly magnified. 



3 a. Var. i'meolalmn. This presents only transverse striae ; but some specimens show minute longitudinal ones, 



passing into the preceding variety. 

 3. Var. I'meolatum. The surface is covered by fine spots or stigmata, as if some adhering softer substance had 

 been separated from it. The same is observed in 2 b, in a less degree. 



Fig. 4. 287. 1. CoNULARiA trentonensis. (Pag. 222.) 



4 a. A specimen (natural size), with the apex broken off. 

 '1 b. Another specimen, more abruptly acute. 



A c. Transverse section of 4 a, near the apex, showing the septum and siphunclc. 

 '1 d, e. Lateral and transverse view of a fragment, showing the convex septum. 

 4/". A portion of the surface enlarged. 



Fig. 5. 288. 2. Conularia geanhlata. (Pag. 223.) 



5 a. A specimen nearly entire, giving the general form of this species. 

 5 i. A portion of the surface enlarged. 



Fig. 6. 289. 3. Conularia papillata. (Pag. 223.) 



«. An imperfect specimen, of the natural size. C 6. A portion magnified. 



Fig. 7. 290. 4. Conularia gracile. (Pag- 224.) 



7 a. A specimen {natural size), the apex broken oft'. 1 b. A portion of the surface enlarged. 



