444 



WEST INDIAN MOLLUSKS— SIMPSON. 



VOL. XVII. 



of tlie more uortliern "Toap; all of them being found in the last-nnnied 

 island : * 



Lund MoUusks common to Ptierto Rico and other Greater AntiUean Islands. 



Species. 



Vaginula occidentalis, Guild 



Zouites guudlaclii, Pfr 



niiiuisrulua, Binn 



(llaiidina terebra-forinis, Shutt 



Thy sauopbora vortex, Pfr 



dioscoricola, C. B. 

 Adams. 



euclasta, Shutt 



rieurodoiitf niargiuata, Gniel 



Buhiuiihis uitululu8, Pfr 



liiiaociis, Fer 



exilis, Gmel 



I'seudobalca douiin.sueii.sis, Pfr 



CylindreHa pallida, Guild 



Opeas .subula, Pfr 



goodalli, Mill 



Subulma or tuna, Chan 



oitoiioidcs, C. B. Adauis . . 



Spiraxis paludmoido.s, d'( )rb 



Steiiogyra terebraster, Lam 



Pupa p'ellucida, Pfr 



bexodon, C. B. Adams. 



f 'erioii striatella, Fer 



microstoma, Pfr 



Succinea riisii, Pfr 



Heliciua phasianella, Sowb .. 



Cuba. 



Haiti. 



Jamai- 



Elsewhere. 



Guadelupe; Martiuiijun; St. Vincent. 



Florida. 



United States ; Mexico. 



Florida; Barbados. 

 Florida. 



Lesser Antilles; Florida. 

 Lessor Antilles. 

 Mainland ; Lesser Antilles. 

 Florida; Mexico; Lesser Antilles. 



Texas; Mexico; Florida; Lesser An- 

 tilles. 



Fresh-water moUusks common to Puerto Rico and other of the Greater Antilles. 



It will be seen that so far as species are concerned the relation- 

 ship between the land and fresh-water mollusks of Puerto Kico is much 

 closer with the Greater than with the Lesser Antilles. It is, however, 

 among the genera and minor groups that the break in the moUuscan 

 faunas of the two archipelagoes is most noticable. Among the Helices 

 the genus Pleurodonfe, t which includes all the sections of the old and 

 well known Carocolus, is distributed throughout the West Indies, 

 northern South America, and Central America. The section Carocohis, 

 consisting of lenticular toothless species, is confined to the Northern 

 Archipelago, and is found in Cuba, Haiti, and Puerto Kico. The section 



* Helix nemoralina is common to Haiti, St. Thomas, St. John, Tortola, and the 

 Virgin Ishuids, but is not found in Puerto Rico. 



+ 1 follow essentially Pilsbry's arrangement of the West Indian Helices, in ix., 

 series 2, pp. 54 and Si, and v., p. 5, Manual of Coucbology. 



