OF CONCIIOLOGY. 351 



the genus Bulimulus, the latter represented in the "West In- 

 dies generally, but the former only in the Guadeloupe sub- 

 province. Liguus, now with much reason separated from 

 Achatina, belongs to the West Indies, in which Achatina proper 

 is not represented. Tornatellina embraces LepAinaria, a 

 few species of which inhabit tropical America and the West 

 Indies. Pupa, in its wide signification, is not AVest Indian, 

 but the subgenus Strophia may be so termed. 



Tt is worthy of notice, that of the genera common to the 

 Continent and Islands, the largest species of each genus, speak- 

 ing generally, is found where the genus has the greater num- 

 ber of representatives, Cylindrella being the most striking ex- 

 ception ; and I believe that this will be found to be the case 

 with a majority, at least, of the well established subgenera. 



I stated (p. 137) that species of operculates and inoperculates 

 common to the Continent and Islands are, with few excep- 

 tions, of West Indian rather than American forms, — this, 

 however, is not entirely correct as regards the inoperculated 

 species. Of such species about one-half of the whole number 

 are found in North America (including Mexico), and the Cuba 

 subprovince, — they are of West Indian and Mexican forms, 

 and about one-fourth of them are distributed in the other in- 

 sular subprovinces. The remainder of such species inhabit 

 the Southern Continent and chiefly the Guadeloupe subpro- 

 vince, and are of West Indian and South American forms. 

 The species of Helix common principally to the French Islands 

 and French Guiana (with Liguus virgincus of Haiti), I am 

 disposed to consider West Indian. 



With respect to the occurrence of identical species in more 

 than one of the subprovinces, the greater number are in Cuba 

 and Jamaica, and Cuba and Porto Rico, — they are, at least, 

 numerous in Haiti and Jamaica, and Haiti and the Guadeloupe 

 subprovinces. 



The annexed Table, (illustrative and explanatory of the 

 foregoing remarks,) in which Pfeiffer's classification is used, 

 gives the names of the genera represented both on the Amer- 

 ican Continent and in the West Indies, with the number (ap- 

 proximate, rather than positively correct) of species in each 

 province or subprovince : — 



