122 On the Flora and Fauna of Santa Cruz. 



Thelidomus incerta, Fer. This occurs, also semi-fossil, in St. 

 Thomas; — its nearest ally is T. notahilis, Shuttl. of St. Jan and 

 Tortola, 



Plagioptycha Santacruzensis, Pfr. Allied closely to P. nemo- 

 ralina, Pet., of St. Thomas, St. Jan and Tortola. 



Bulimulus extincttis, Pfr. Xear to B. elongatus, Bolt., which 

 inhabits Porto Rico, the Virgin Islands, islands on the Anguilla 

 Bank, several of the northern Caribbees, Cnra9ao and Buen Ayre. 



B'ulwndus Rihei, Pfr. This can scarcely be compared with 

 any known West Indian form. 



Strophia rudis, Pfr. rar. latilahrU, Pfr. Allied to species 

 now living in Porto Rico and in seA'eral of the eastern Virgin 

 Islands. ' ■ 



Semi-fossil Species, extinct ix Saxta Cruz, but livixg 



elsewhere. 



Cliondropoma Tortolense, Pfr. A specimen from Santa Cruz, 

 in my cabinet, I referred to this species, which now inhabits Tor- 

 tola and several of the more eastern Virgin Islands. 



Caracolus caracolla, L. This species is found living in Porto 

 Rico and Vieque ; it is nearly allied to C. sarcocJieila, Morch, 

 C. insititia, Shuttl , and C. excellens, Pf., of liajti. 



In my Catalogue, Ann. N. Y. Lye, vii, 1861, I included 

 C. margineUa, Gmel., as occurring semi-fossil in Santa Cruz, but 

 erroneously, as I was assured by the late Mr. Robert Swift. 



Stwcinea ajjproxwums Shuttl. — I referred a sjDecimen in my 

 cabinet to this species, which occurs in Porto Rico, the Virgin 

 Islands, and several of the Caribbees. 



