202 On the delations of Oerlain 



" Forming my judgment from the soft parts and the lingual dentition, 

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

 AmphibuUma might then be divided into the following groups : — 



Amphibulima s. strict. Type ^4. patula. 

 Omalonyx D'Orb. " 0. ungvis. 



Brachyspira Pfr. " A. pardalina and tigrina." 



Without knowledge of the j;iw of AmjjJiihulima, and we 

 scarcely think that the genus can be elasmognathous, Ave are 

 unable to decide whether it belongs to Succininoe or not, but 

 have a strong impression that its proper position is in 

 Helicince. 



The dentition of AmphibuUma, as shown in our figure, 

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

 excepting in the marginal teeth, which are very long and 

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

 as characteristic of Saccinea, is entirely wanting in AmpJiib- 

 uIima. 



•V. Martens (Zool. Record, 1868, p. 491) observes that 

 "Mr. Guppy reestablishes Ajnphibiilima as a genus distinct 

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

 tition, but without pointing out the difference." 



Succinea s. strict. — The animal, 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 Avhatever group or section they belong, which are elas- 

 mognathous, should be admitted in Succinince. 



There are several elasmognathous ijcnera 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, Avhich is very near to, if not 

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

 animal of the latter be as described by Gup[)y, we cer- 

 tainly should not place the species in Brachyspira, which 

 belongs rather to Saccinea than to AmpJiibuIima. 



Tryon (Amer. Jour. Conch., 11, 236-241, 1866) refers 



