SECTION VI 



CEPHALOPODA OF THE EOCENE MARLS OF NEW JERSEY. 



In Mr. F. B. Meek's " Catalogue of Eocene Shells and Fish from Shark 

 River, "published in the 'appendix to the Ceological Report of New Jersey 

 for 1868, on p. 731, et seq., he enumerates three species of Cephalopods : 

 Aturia Vanuxemi and. two species of Cimomia, G. Burtini Nyst's sp. and C. 

 Lamarcki Deshayes sp., both originally published under the genus Nauti- 

 lus. Among all the fossils which I have examined from the Eocene layers 

 of New Jersey I have seen evidence of only two species of Cephalopoda, 

 namely, Aturia Vanuxemi and that herein described as Nautilus Cookana. 

 No specimen or fragment which I have seen would appear to correspond to 

 or possess the features of the genus Cimomia as given by Mr. Conrad, which 

 are as follows : "Nautiloid ; septa sinuous, doubly waved, or sigmoid, num- 

 erous; siphon small, central." Nautilus Burtini Galcotti is given as the 

 type. The two species above mentioned, N. Burtini and N Lamarcki, are 

 usually considered as synonyms of each other, but Deshayes assures us they 

 are very distinct. Mr. Meek appears to have identified or recognized both 

 forms, but upon what authority he does not say. The nautiloid forms 

 which I have seen have only the straight, or nearly straight, septal lines 

 crossing the cast, and certainly could not have given rise to the mistake 

 had they been examined. So it is possible Mr. Meek may have seen some 

 form that has never come under my observation. The specimens of the 

 following species, to which I have given a new name, certainly do not 

 possess any of the features of Mr. Conrad's genus, and I can find no descrip- 



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