1883. 153 Trans. N. V. Ac. Set. 



lected by Dr. JULIEN. The species whose specific names are printed 

 in italics, are peculiar to the islands named. 



Heh'x pentodon, Mke., has been included in lists of Curasao shells, but 

 it IS unquestionably a young Sirophia, and probably of S. uva, L. 

 Pfeiffkr suggests (Mon. VIII) that it may be the young of S. M tiler i, 

 Pfr., found in the Bahamas. 



It will readily be admitted, seeing the genera represented, that the 

 fauna of the islands under consideration, is, as remarked by Gibbons 

 with respect to Curasao, by no means of the character one might expect 

 from their geographical situation. 



Tudora and Cistula, of the operculates, are alone represented. Of 

 the former, nearly all the known species inhabit Jamaica, Cuba, and 

 Hayti. The genus has no representative in the Lesser Antilles. The 

 greater part of the species of Cistula are from Jamaica, Cuba, Hayti, 

 and Porto Rico, in each of the islands of Sombrero, St. Croix, Anti- 

 gua, and Trinidad there is one species. 



The occurrence, in Cura9ao and Buen Ayre, of Strophia and Ma- 

 croceramus, is peculiarly interesting. Both genera are unrepresented in 

 the Lesser Antilles. Nearly all the known species of Strophia inhabit 

 the Bahamas and Cuba. In Hayti and Porto Rico are two, the same 

 species — one in the Virgin Islands, one fossil, in St. Croix, and the im- 

 pression of one is found in the phosphatic lime rocks of Sombrero. 



Strophia is represented on the American continents, by one species 

 only, in Florida and several of the adjacent Keys — a species which 

 belongs to Cuba and the Bahamas. 



With regard to Macroceramus, a large majority of the known species 

 belong to Cuba and Hayti ; to Jamaica, Porto Rico, and the Virgin 

 Islands, 2; Bahamas and Turk Islands, 2; Anguilla, i. There are 

 four or five species in Florida, Mexico, and Central America. 



Of Cylindrella, about three-fourths of the known species are found 

 in Jamaica, Cuba, and Hayti. There are five or six species only in the 

 Lesser Antilles. 



I have thus conclusively shown that the land shell fauna of Aruba, 

 Curafao, and Buen Ayre has very marked alliance with the faunas, 

 especially of Jamaica, Cuba, and Hayii ; very little with that of the 

 Lesser Antilles, in which Tudora, Strophia, and Macroceramus are 

 wanting, and Cistula and Cylitidrella have trifling representation. 



The fauna of the three islands under special consideration has no 

 appreciable connection with the adjacent continent, save, perhaps, as 

 regards B. tnultiltneatus. 



Looking at the remarkable fauna of the the three islands, I may call 

 attention to the interesting result of the soundings taken across the 

 Caribbean Sea, in the winter of 1878-9. and reported to the Superin- 



