14 Assembly 



" This genus abounds in the Silurian rocks, but I have not seen a species 

 '* from any more recent formation."* 



Mr. CoNBAD describes sixteen species under this genus, among which "were 

 included the C. bisulcata since described by De Verneuil as the tj^pe of the 

 Genus Grammtsia, under the name of G. hamiltonensis. 



The description corresponds in many respects with that of Paljearca, and 

 the illustration given by Mr. Conrad likewise resembles that genus. Should 

 an examination of the typical species prove the two identical, the later name 

 will give place to that of Cvprioardites. 



Cypricakdites ( Conrad ) .f 



* "When these remarks were written, the Hamilton and Chemung groups were 

 regarded by the New-York Geologists as Silurian, and as being the equivalent of 

 the Ludlow rocks of England. 



t This figure is copied from the original figure of Mr. Conrad, accompanying 

 his description of the genus in 1841. The plate upon which this occurs was 

 engraved to accompany the Annual Report of 1841 ; but, unfortunately, only a 

 fimall number were ever distributed, so far as known to the writer. The same 

 plate contains illustrations of the Genera Nuculites, Lyrodesma, Orthonota, 

 Cyrtoxites, Orthostoma, Dictyocrinus, Aspidolites and Dicranurus, as well as 

 of one species of Platyceras ; all genera proposed by Mr. Conrad. At the time 

 I proposed the Genus Paljearca in 1847, I had overlooked the description and 

 figure of Cypricardites ; and it is only since the printing of that part of Vol. iii, 

 Palseontology of New-York, that my attention has been directed to the subject of 

 the preceding note. 



