I'l.ATK l.X\ 111— Continued. 



CONOOARDIIIM DEXTICULATIJM. 



rage 413. 



Figs. 24, 25. Left side iind ventral views of an imperfect specimen, onlai'ged lo three diameters. Fig'. 25 



repi-ei*ents the dentieulations of the margins as too slender, and interlocliing more than in the 



specimen. 



Hamilton group. York, N. Y. 



CONOCAKUIL'JI CONOINNUM. 

 r:iKe 414. 

 V\g. 2C. Posterior view of a specimen. 



Hamilton group. P^ratVs falls, N. Y. 

 Pig. 27. Ventral view <rf another individual. 



CONOCAKDIUM LIKATUM. 

 Page 414. 

 Fig. 28. A rig-ht valve as obtained from a gutta-pei-cha impression of a natural mould, enlarged to three 

 diameters. 



Lower Chemung group. lOiaai. JS. Y. 

 Fig. 29. Anterior view of a specimen enlarged to thi-ce diameters. 



Lower Chemung gfroup. Jthaca, Xf- Y. . 



' ' ' K IKI; 



CONOCARDIOM TEGULUM. 

 Page 415. 

 Fig. 30. A fragment of an individual of this species. 

 Fig. 31. An enlargement of the surface of the preceding. 

 Niagara group. 



CONOCARDIUM INCEPTUM. 

 I'age 415. 

 Fig. 32. Ventral view of a specimen, enlarged to two diameters. 

 Lower Helderbei-g group. Albany Co., N. Y. 



CONOCARDIUM RELIQUUM. 

 Page 41S. 

 Fig. 33. A view of the posterior end of a specimen as obtained from a gutta-percha impression. 

 Chemung group. 



