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 y()unger 

 individual, received later, throws some doul)t 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. tuberosum, it must represent 

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

 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 Cerithium. 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, Cerithium tuberosum Column^ will 

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



III. Genus Cerithium Columnae 



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



1784. Clava Martyn, The Universal Concbologist, London. 



17!)2. Cerithium Bruguiere, Hist. Nat. des Vers., Encyc. Meth., I, pt. 2, 467. 



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



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



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



Abth. 26, 2. 



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



Fig. 1. — Cerithium tuherosum. Copy of Columnge'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 i)arni Buccini tuberosi candidi, ad Cerithia referendam, 

 oris mai'gine supra tubulum elata, et incumbens non inuersa ut In alljs magnis 



