PROCEEDINGS OF THE NATIONAL MUSEUM. 



431 



Distribution of genera of West Indian land and freshwater mollusks — ContiDued. 



t The species included in this genus, from Cuba and Haiti, were placed by Pfeiffer in Truncatella in 

 a section which he called Montana- (Mon. Pneuni. Viv. Sup. ii, p. 3), on account of their habitat in 

 th(- mountains, away from the sea. Crosse has placed them in the sub-genus Blandiella (J. de Couch, 

 XXX., p. 303) and states that, so far as is known, they differ from true Geomelanias only in the absence 

 of a prolonjiation of the anterior part of the aperture. Some of the latter have this development at 

 the base of the aperture, others at the rifrlit iiiari;iii, and a few are scarcely, if at all, produced. B. 

 flicosta, and lirata of Cuba an- in the National Museum collection, and some specimens of these show 

 this peculiarity to a sli^lit di'<irce, and I should pronounce them both to be Geomelanias on concholog- 

 ical evidence without llie sliiilitest hesitation. 



* I'lattj.stoina Klein. a|)]>lied l>y Fisclier and Crosse in a generic sense to this group of peculiar 

 Jamaican forms ty])iHe<l l)y Neocyclotux jomaicen.si)i Chemnitz (Miss. Sci. au Mex. 7th part, p. 149), has 

 been several times preot-i-upied. Klein was not a binoiiiial autlior. 



Tlie name, therefore, can not stand, and I would suljstitiite tliat of Pttichocochlis in place of it. The 

 group on conchological characters seems to be nearly related to Neocyclotug Fischer and Crosse, in 

 which, for the present, I think it had better remain as a subgenus. 



It will be seen from the above table that no less than 37 genera are 

 either peculiar to the (Ireater Antilles or have here their principal 

 developement. These are Thysanophora, Sagda, Zapliysema, Polymita, 

 Hemitrochus, Pleurodonte, Cej)oliSj Lifjuus, CyHndrella, Vendryesia, Mac- 

 roceramus, Pineria, Glandinella, 3£elanieUa, Cerion, Proserpina, Geome- 

 lania N'eocyelotus, Bolleia, Groeidopoma, Megalomastoma, Choanopoma, 

 Jamaicia, Gtenopoma, Gistula, Ghondropoma^ Diplopoma, Licina, Tudora, 

 Colobostylus, Bkcsospira, Xenopoma, AdamsieUa, Eutrocliatella, Alcadia, 

 Lucidella, and Stoastoma, and they are represented in this region by 



