OF THE DUTCH WEST-INDIAN ISLANDS. 187 
of the Leeward islands, north of Venezuela, between Punta 
Gallinas and Punta Peùas, from which a mollusc has been 
recorded, is the small group of islets Los Roques. Crosse 
(Journ. de Conch. XXI, p. 69; XXII, p. 69) mentions 
from Los Roques a single species Ravenia (nov. gen.) blandi 
(nov. spec.), only found there. According to Pilsbry (Man. 
of Conch. XIX, p. 29), this shell is closely related to the 
section Huspiraxis of the genus Spiraxis; only for the 
remoteness of the locality he will maintain Ravenia as a 
subgenus. The affinities of this mollusc are to be sought 
for, not in the South-American continent, but in Jamaica. 
The genus Spiraxis is recorded chiefly from that island; 
moreover from Cuba, Isle of Pines, Haiti, Mexico and 
Central-America. 
According to our present knowledge we can only state 
that the islands, north of Venezuela, possess a mollusc-fauna, 
peculiar to themselves, and that its nearest allies are living 
in the Greater Antilles and in Central-America. 
Leyden Museum, March 11, 1914. 
This paper was already printed, when the Museum came 
in the possession of a collection of shells, purchased from 
Messrs. Sowerby and Fulton, among which were speci- 
mens of 
*Cistula raveni Cr. from Curacao. 
*Tudora pupaeformis Sow. 
*Chondropoma julieni Pfr. ; from St. Martin. 
*Chondropoma igneum Rve. | 
The last named species, so far as I know, has not been 
recorded until now from St. Martin. Paetel (Catalog der 
Conch.-Samml., IT Abth., 1889, p. 477) gives as its habitat 
Haiti. 
The number of species known from St. Martin, thus 
becomes 49, the total number recorded from the Dutch 
West-Indian islands 74, of which the Leyden Museum 
possesses only 18 species. 
April 7, 1914. 
Notes from the Leyden Museum, Vol. XXXVI. 
