202 On the Relations of Certain 



'* Forming my judgment from the soft parts and the lingual dentition, 

 I should separate AmphihuJima as a genus from Succinea. The genus 

 Amphibulima might then be divided into the following groups : — 



Amphibulima s. strict. Type A. patula. 

 Omalonyx D'Orb. " 0. iinrjuis. 



Brachyspira Pfr. " A. pardalina and tigrina." 



Without knowledge of the jaw of Amphibi(Uma, and we 

 scarcely think that the genus cau be elasmognathous, we are 

 unable to decide whether it belongs to 8uccinin(E or not, l)ut 

 have a strong impression that its proper position is in 

 Helicinm. 



The dentition of Amphibulima, as shown in our figure, 

 does not materially differ from the form usual in the Helicidce, 

 excepting in the marginal teeth, which are very long and 

 narrow. The cutting away of the plate, before referred to 

 as characteristic of Succinea, is entirely wanting in Amphib- 

 ulima. 



V. Martens- (Zool. Eecord, 1868, p. 491) observes that 

 "Mr. Guppy reestablishes Amphibulima Si^ o. genus distinct 

 from Succinea (Drap.) on account of its different lingual den- 

 tition, but without pointing out the difference." 



Succinea s. strict. — Theanitnal, lingual dentition and form 

 of jaw need no special notice in the present paper. We 

 would express, however, the opinion that those species only, 

 to whatever group or section they belong, which are elas- 

 mognathous, should be admitted in Succinince. 



There are several elasmognathous genera with animals of 

 varied forms on which we have no occasion here to remark. 



Brachyspira Pfr. — This group is based on the form of 

 shell, and it is worthy of notice that Albers (ed. 2) gives as 

 the type S. tigrina Lesueur, which is very near to, if not 

 identical with, as Guppy remarks, his A. pardalina. If the 

 animal of the latter be as described by Guppy, we cer- 

 tainly should not place the species in Brachyspira, which 

 belongs rather to Succinea than to Ainphibulinia. 



Tryon (Amer. Jour. Conch., II, 236-241, 1866) refers 



