Rocks and Fossils of Phillipshurghf C. E, 317 



Some time previously to the 1st of July, 1859, the first 18 pages 

 of the palaeontological part were printed, and made up into a pam- 

 phlet. A copy was sent to the editors of Silliman's Journal and 

 was noticed by them in their July number, at p. 149. I saw this 

 notice and wrote to a friend in Albany to send me a copy. He 

 could not get one as only a few had been made up, apparently for 

 private distribution. The printer however gave him some loose 

 sheets as far as page 18, which had been corrected for proof and 

 thrown aside after the pamphlet was published. I received them 

 in the beginning of the month of August. I afterwards, in Sep- 

 tember, received the pamphlet. At that time, i.e. in September, 

 only 18 pages had been issued. The remainder, containing a des- 

 cription of Trvplesia, must have been published some time during 

 the Autumn of 1859. The note on page 62 could only have been 

 written after the meeting of the American Association, in Auo-ust 

 as it contains information that was then first made known. I feel 

 satisfied therefore that the genus Camerlla was published several 

 weeks before the genus Triplesia, and besides, as Prof. Hall did 

 not notice any of the internal characters, his description can have 

 no authority. 



In the Twelfth Annual Report the reader will find several other 

 genera thus dated. 



" Genus Nucleospira. (Hall 1857)" 

 " Genus Trematospira. (Hall 1857)" 

 " Genus Leptocoelia. (Hall 1856)" 

 " Genus Eatonia. (Hall 1856)" 



I think naturalists have a right to ask, in what works were the 

 descriptions of these genera published at the dates indicated ? And 

 if they were not published at the times stated, for what purpose 

 were these dates given ? The same questions may be put with re- 

 spect to the genera Rhynchospira, Tropidoleptus, and Beiisslceria 

 which were first described in the same work. 



The genus Camerella appears to belong to the family Rhyn- 

 OONELLID^, the species differing from the ordinary forms of Rhijn- 

 co7ieUa by having the surface, in general, either not ribbed at 

 all, or with only a few obscure plications not extending to the 

 beak. The interior differs in having the dental plates of the 

 ventral valve converging so as to form a small triangular or oval 

 chamber of variable dimensions as in Pentamerus. The species 

 known up to the present time are the following : 



