New Species of Corhula from Jamaica. 288 



26. Clausilia epistomium KUster Mon. p. 13. 1. 1. f. 5-8. 1847. 



Station. — On rotten wood, and among dead leaves and sticks 

 under stones, in moist shady places. 



Habitat. — Marmato, and Tacon. 



Several undetermined and new species of Helix^ Bulimus, 

 Achatina, and Succinea^ and of Ampullaria, and other freshwater 

 shells, were also collected. T. B. 



October, 1852. 



Descriptions of new Species of Coebula from Jamaica. £1/ 

 C. B. Adams. October, 1852. 



Mr. Eeeve's monograph of Corbula (1843.-4) describes 48 

 species, including Potamomya. Philippi tas since described 2 

 species in the Zeitschrift fiir Malak., and we have added (Catal. 

 Panama Shells) 1 Corbula proper, and 3 Potamomyae. Omitting 

 some of doubtful generic character, about 6 others had been 

 previously described. Of these 65 species, 6 are from unknown 

 habitats, 1 is from the Arctic regions, 2 from Europe, 2 from 

 West Africa, 21 from the Indian Ocean and the adjacent part 

 of the Pacific, mostly from the Philippine Is., 4 from New Zea- 

 land and New Holland, 15 from the Panama zoological pro- 

 vince, 1 from Chili, 1 from the United States, 2 from the West 

 Indies, and 2 (which are Potamomyae) from the Eio de la Plata. 

 The 2 Corbula3 proper from the Caribbean zoological province 

 are C. operculata Phil, from St. Thomas, and C. equivalvis Phil, 

 from Cuba. 



To these we now add 10 species. We have great pleasure i^ 

 commemorating with them the names of gentlemen who, bv 

 personal collections in the West Indies, have contribute(J valu- 

 able materials for the subject of the geographical distribution of 

 the Mollusca. 



In the following descriptions, the larger is called the right 

 valve, the shorter end being anterior, with the ligament a little 

 behind the beaks. This explanation appears necessary, on 



