OP CONCHOLOGY. 361 



Cylindrella has an extraordinary number of species in Cuba, 

 and of very varied forms, both externally, and internally as 

 regards the characters of the axis. The subgenera Urocoptis 

 (C. Ghiesbreghti, Pfr.,) and Holospira (C. Pilocerei, Pfr.) are ra- 

 ther continental, while Gongylostorna (C. elegans, Pfr.,) and 

 Trachelia (G. porrecta, Gould) may be especially referred to 

 Cuba. 



The occurrence in Cuba of both operculated and inopercu- 

 lated species with well developed spinous processes is curious, 

 — I allude to Choanopoma hystrix and echinus, Wright, to Me- 

 laniella acuticostata, Orb., and Cylindrella Elliotti, Poey. 



The family Proserpinacea belongs to Mexico, — the subgenus 

 Proserpina (P. depressa, Orb.) has insular representatives only 

 in Cuba, the Isle of Pines and Jamaica. 



Strictly South American forms are rare in the West Indies, 

 excepting in the Guadeloupe subprovince. In Cuba there are 

 a few species of Bulimulus, but of subgenera which are ra- 

 ther of Mexican and Central, than South American form, viz : 

 Liostracus Marielinus, Poey, lound also on the Florida Keys, 

 and L'plomerus sepulcralis, Poey, which, as well as Mesem- 

 hrinus Bahamensis, Pfr., inhabits New Providence. 



Orthalicus is most numerously represented in South America. 

 It has one species (0. vndatus, Brug.) in Cuba, found also in 

 Jamaica and in the Guadeloupe subprovince. 



In South America there are two species of Balea, and it is 

 remarkable that one (B. Canteroiana, Gund.) is found in Cuba, 

 the only West Indian species, referred, indeed, to the genus 

 Balea by Pfeiffer, with some doubt. 



There are several species in the Cuban subprovince, 

 which have most probably been introduced from Europe, — 

 Stenogyra decollata, L., found at Havana, also at Charleston, 

 S. Carolina, Helix ventrosa, Fer., and Gionella acicula, Mull., at 

 Bermuda, — the latter also inhabiting Florida, and lately dis- 

 covered at Princeton, N. J., by Mr. A. D. Brown. 



2. Jamaica. Many West Indian forms belong to, and, as is 

 the case with Cuba, are peculiar to this subprovince. The 

 most characteristic subgenera of Helix are : Gysticopsis (H. 

 tenerrima, (C. B. Ad.), Pleurodonta (H. lucerna, Mull., H. soror, 

 Fer., and H. sinuata, Mull.), and Leptoloma (H.fuscocincta, C. 

 B. Ad.) Goryda and T helidomus, more particularly Cuban, 

 are represented, the former by several species, of which H. 

 Gossei, Pfr., may be called the type, and the latter by H. cog- 

 nata, Fer., and H. aspera, Fer. 



The genus Sagda (S. Cookiana, Gmel.) is peculiar to Jamaica, 

 with the exception of the subgenus Odontosagda, which be- 

 longs to Haiti. 



