352 



LESSER ANTILLES 



fossil Caracolus which are now living in Porto Eico, together with 

 one Plagioptycha and one Thelidomus (sub-fossil). The gradual 

 disappearance of some of the characteristic greater Antillean 

 forms, and the appearance of S. American forms in the Lesser 

 Antilles, is shown by the following table : — 



(d) In Guadeloupe we find Cyclophorus, Ampliihulimus, Homal- 

 onyx, and Pellicula, which are characteristic of S. America, and 

 nearly all recur in Dominica and Martinique. These islands are 

 the metropolis of Dentellaria, a group of Helix, evidently related to 

 some of the forms developed in the Greater Antilles. Stragglers 

 occur as far north as St. Kitt's and Antigua, and there are several 

 on the mainland as far south as Cayenne. Traces of the great 

 Bulimus, so characteristic of S. America, occm- as far north as S. 

 Lucia, where also is found a Parthena (San Domingo and 

 Porto Eico). Trinidad is markedly S. American; 55 species in 

 all are known, of which 22 are peculiar, 28 are common to S. 

 America (8 of these reach no farther north along the islands), 

 and only 5 are common to the Antilles, but not to S. America. 

 The occurrence of Gundlachia in Trinidad has already been 

 mentioned. 



The Bermudas show no very marked relationship either to 

 the N. American or to the West Indian fauna. In common 

 with the former they possess a Polygyra, with the latter (intro- 

 duced species being excluded) one species each of Hycdosagda, 

 Subidina, Vaginula, and Helicina, so that, on the whole, they 

 may be called West Indian. The only peculiar group is Poecilo- 

 zonites, a rather large and depressed shell of the Hyalinia type. 



(2) The Central American Sub-region may be regarded as. 



