XIII. A LIST OF THE LAND AND FRESH-WATER SHELLS 

 OF THE ISLE OF PINES. 



By John B. Henderson. 



The Isle of Pines has been visited by most of the collectors of land- 

 shells interested in the Cuban fauna, and its list of known mollusks 

 has been fairly complete from early times. It is quite likely, however, 

 that careful search would bring to light some of the smaller species 

 common on the adjoining large island, but as yet unrecorded in the 

 census of the Isle of Pines. Among such are the Zonitidae, the Pupidae, 

 some of the smaller Stenogyridae, and several fresh-water species of 

 somewhat wide distribution. 



A large proportion of the species of the island are confined to the 

 two small ranges of limestone mountains in the extreme northern part, 

 known as the Sierra de Casas and the Sierra de Caballos. Of the 

 latter there is an extension in the form of an elevated peninsula with 

 steep sides, which projects into the sea, and is known as Punta del 

 Colombo. The other mountains of the island, such as the Canada 

 Range and the elevations back of Santa Fe, are of limestone crystal- 

 lized into a hard marble, and therefore offer but poor stations for 

 mollusks. The southern portion of the island, separated by a swamp 

 from the northern half, offers a good station for a restricted group of 

 land-snails, which flourish amid the conditions presented by a flat 

 porous limestone covered by scrubby forest-growths. But little has 

 been reported from this region, as it is inaccessible and of no interest 

 to travellers. It is most probable that its fauna will prove to be 

 quite the same as that encountered along the coastal strip in Cuba, 

 where conditions are very similar. The following list includes all 

 the species so far recorded from the island with the addition of a few 

 in my collection taken by myself or by Dr. Nicholas. 



I. Megalomastoma procer Poey. 



M. procer Poey, Memorias Hist. Nat. Cuba, Vol. I, 1854, p. 404, PI. 13, figs. 

 12-18. 



Habitat. — Casas and Caballos Mountains. 



Usually darker in color than the closely allied M. mafii Poey, which 

 occurs in the Organ Mountains of western Cuba. 



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