Genera of Terrestrial MoUusca, etc. 201 



ratis, ineequaUter bicuspidatis (dente medio tricuspidato) 

 instructa."* 



With respect to JT. Salleanus and Cordovanus, the authors 

 state, on the authority of Salle, that the animals are much 

 larger than their shells, as in X. Sumichrasti. 



Xanthonyx, as well as jSimpulqpsis, belongs to Helicinm 

 and not to Succinince. 



Succlnea. Drap. 



Amphibulima. — Albers (I. c, 309) gives as the type of 

 this section of Succinea, A. patula Brug., but without 

 any special description of animal or its dentition. 



Guppy (Ann. and Mag. Nat. Hist., June, 1868) mentions 

 the occurrence in Dominica of A. patula, and we were in- 

 debted to him for the lingual membrane (without jaw), of 

 which we published figure and description in Amer. Jour. 

 Conch. VII, 186 (1871), pi. xvii, fig. 1-2. Guppy does not 

 particularly notice the animal, and we assume in consequence 

 that, as in Succinea s. s., it is capable of retraction within 

 the shell ; indeed the form and character of the shell pre- 

 elude any other supposition. 



Guppy (?. c, June, 1868) describes another species, found 

 by him in Dominica, as Amphibulhna pardalina, the animal 

 of which he describes as follows : — 



"The animal resembles that of Omdlonyx unguis Fer. 

 (D'Orb. Voy. Amer. Mer. pi. xxii, fig. 1-7). The foot is 

 translucent, like a bit of ice dipped in milk, the internal 

 organs showing as a dark, variegated patch about the shell, 

 into which the body is incapable of retraction." 



Guppy adds (and apparently he was acquainted with the 

 dentition [not the jaw], of A. patula only) : 



*Fischer and Crosse (Etudes sur les Moll. Terr, et Fluv. du Mexique et du Guate- 

 mala, 19-2-199, pi. 9, figs. 14-17) give a more detailed description of Xanthonyx, and 

 remark on certain of its affinities witli the genus Binneya. The part of the work 

 referred to reached us after our manuscript was in the printer's hands. 



