36 



PALAEONTOLOGY OF NEW YORK. 



Test and surface ornaments unknown. 



A large specimen, preserving nearly the entire length of the tube, meas- 

 ures 215 mm. on the periphery, and 80 mm. in diameter at the last septum. 



The specimens described are internal moulds preserved in a coarse lime- 

 stone, and the external characters are not shown. 



Distribution. In a limestone of the Clinton group, Piqua, Ohio. 



Cyrtoceras Jason. 



PLATE CXXIV, FIG. 7. 



Cyrtoceras Jason, Hall. Pal. N. Y., vol. v, pt. 2, p. 3S1. 1879. 



Cyrtoceras citum. 



PLATE CXXIV, FIGS. 1-3. 

 Cyrtoceras citum, Hall. Pal. N. Y„ vol. v. pt. 2, p. 372. 1S79. 



GYROCERAS, De Koninck. 1841. 

 Gyroceras Nereus. 



PLATE CXXIV, FIG. 4 

 Gyroceras Nereus, Hall. Pal. N. Y., vol. v, pt. 2. p. 373. 1S79. 



Gyroceras laciniosum. 



PLATE CXXIV, FIGS. 5, 6. 

 Gyroceras laciniosum, Hall. Pal. N. Y., vol. v, pt. 2, p. 376. 1S79. 



Gyroceras ? Stebos. 



PLATE CXXVI, FIG. 7. 



Gyroceras Stebos, Hall. Fifth Ann. Rept. State Geologist. Expl pi. (126) 11, fig. 7. 3SS6. 



Several specimens of this species have been obtained from the Waverly sand- 

 stones in Pennsylvania. The general form and appearance is that of a shell 

 belonging to the genus Gyroceras, although no traces of septa are preserved. 

 The ventral or peripheral side shows a longitudinal groove, which may be of 



