﻿I'M i I REVIEW OF FROG-SHELLS AND TRITONS I 19 



Operculum with apical nucleus. 



Varices lateral and continuous. 



Anal sinus subtubular, at the suture. 



Body with a continuous appressed rugose callus. 

 Shell heavy, nodulous. 



Anal sinus produced. Sect. Ranella (bufonia Gmelin). 

 Anal sinus short. Sect. Lampadopsis (rhodostoma 

 Beck). 

 Varices variable, usually lateral and continuous. 

 Shell thinner, granulous. 

 Anal sinus shallow, short. Sect. Colubrellina (condilus Gmelin). 

 Subgenus Aspa II. and A. Adams. 

 Shell with the spire depressed. 



Varices uniformly lateral, smooth. 



Anal sinus produced as a gutter on the body. 



Shell thin, smooth. Aspa (marginata Gmelin). 

 Subgenus Bufonaria Schumacher. 

 Shell with elevated spire and sculptured surface. 

 Varices not uniformly lateral. 



Anal sinus short, at the suture. 

 Surface sparsely tuberculous. 



Shell thin, body callus smooth, appressed. Sect. Crossata 

 (ventricosa Broderip). 

 Varices feeble, irregularly disposed. 



Body callus continuous, rugose, with raised margin. Sect. 

 Bufonaria (scrobilalor Linne). 

 Shell with elevated spire and prominent sculpture. 

 Varices irregular, sharp, elevated, crenate. 



Anal sinus shallow, its fasciole tabulating the whorls. 

 Sculpture reticulate, the spirals stronger, continuous. 

 Body callus thin, with elevated margin, smooth. 



Canal strongly recurved. Sect. Craspedotriton Dall, 

 now Type, Triton convolutus Broderip. 



The following synonymy will enable one to follow the fluctuating 

 nomenclature of the group, though not intended to be exhaustive. 



Genus BURSA Bolten 



Murex (sp.) Linne, Syst. Nat., ed. x, p. 748, 1758. 



Rana (Anonymous), aIus. Calonnianum, p. 33, 1797. M. scrobilalor 



and .1/. rana L. cited. Not Rana L. 1758. 

 Bursa Bolten, Mus. Bolt., p. 128, 1798; 1st sp. cited B. rana Bolten 



(= Ranella spinosa Lam.) ; Mus. Bolt., ed. 11, p. 91, 1819. 

 Gyrinenm Link, Beschr. Rostock Samml., p. 123, 1807. Includes species 



of Bursa and Murex gyrinus Gmelin + Ranella ranina Lam. 

 Biplcx (sp.) Perry, Conch., expl. pi. iv, v, 181 1. 

 Buffo Montfort, Conch. Syst., 11, p. 575, 1810; B. spadiccus aItf. 



= Murex crassa Dillwyn + Ranella granulate Lamarck. 

 Bufonaria Schumacher, Essai, p. 251, 1817; a Ranella spinosa Lam. 



(M. rana /3, L.) ; (3, M. scrobilator L. 



