10 ANNALS NEW YORK ACADEMY OF SCIENCES 



C. nodulosum at first obtainable, it seemed that the two species belonged 

 to the same phyletic series, but the absence of ribs on a somewliat younger 

 individual, received later, throws some doubt upon this supposed relation- 

 ship. The point can only be determined by a study of younger stages of 



^ C. nodulosum than are now available, and in case the latter shell proves 

 to be different in its development from C. tuherosum, it must represent 

 a very restricted group, for among species now referred to Ceritliium 

 the absence of ribs on individuals having a well developed shoulder is an 



^ extremely rare feature. In this case also, with C. nodulosum as geno- 

 type, the name Ceritliium. would be used in a very restricted sense, and a 

 new name would have to be given to the genus as understood by Columnae 

 and Bruguiere. 



For the purposes of this paper, Ceritliium tuherosum Columis".^; will 

 be used as a standard of comparison for other species of the genus. 



III. Genus Cerithium Columnge 



1616. Cerithium Fabii CoLUMNiE, De Aquatilibus, pp. S3, 57. 



1784. Clava Martyn, The Universal Concbologist, Loudon. 



1792. Cerithium Bruguiere. Hist. Nat. des Yers., Encyc. Metb., I, pt. 2, 467. 



1799. Cerithium Lamarck, Prodrome nouv. class., p. 73 (not seen). 



1801. Cerithium Lamarck, Syst. des aniniaux sans vert., p. 85. 



1898. Cerithium Kobelt, Syst. Concb.-Cabinet von Martini u. Chemnitz, Bd. I, 



Abth. 26, 2. 

 1906. Cerithium Cossmann, Essais de Paleoconch. Comp., VII, 65. 



Fig. \.— Cerithium tuherosum. Copy of Columnfe's original figure X 1. 



After the description of Buccinum maximum and mention of other 

 species of Buccinum, Columnge refers to this species as follows : 



Sed rariorem banc parui Buccini tuberosi candidi. ad Cerithia referendam, 

 oris margine supra tubulum elata, et incumbens non inuersa ut In alijs magnis 



