358 a. A. Pilshry — Mollusea from the Island of Dominica. 



CYCLOPHORID^. 



Cyclophorus (Amphicyclotus) amethystinus Guppy. (ii843). 



There can be no doubt that this species is distinct from C. 

 scJirammi, althougli the young greatly resemble the latter. It is 

 known only from Dominica. 



Note. — In the above article it will be seen that Mr. Pilsbry 

 makes but fourteen species and none of them are new, several 

 specimens Avhich had been supposed, in a hasty examination, to be 

 different species proving to be only color varieties of the other 

 described forms. 



The small number of species obtained by us was doubtless due to 

 the fact that our collections, as stated at the beginning of my 

 article, were made almost exclusively at a considerable elevation 

 (from 1000 to 2500 feet), and no doubt mainly above the range of 

 many species such as Succinea approximans, AmphibuliTna, ruhes- 

 cens, Leptinaria lamellata, Helix dentiens, Helicina fasciata, H. 

 antillartim, etc. 



A large part of the Mollusca wei-e collected in the vicinity of 

 Bass-en-ville, at about 2000 feet elevation, and in the midst of the 

 deep woods, which may also account for the absence of some species 

 that frequent the gardens and plantations. 



Here we found Helicina rJiodostoma abundant on the trunks of 

 trees and old stumps about our camp. 



The Layou River flowed past our camp at this point, and in it 

 Neritina punctulata was exceedingly abundant. All the speci- 

 mens we saw, and we examined hundreds, were marked by cavities, 

 varying much in size but often very deep and wide, which had the 

 appearance of having been drilled or bored out. In many cases 

 these holes covered the whole shell, but I think we never found 

 any that had penetrated entirely through it. 



Stenogyra octona was very abundant under logs and stones in the 

 vicinity of all our camps. 



Vagimda punctatissima was not common, but we found several 

 specimens under logs and stones in the vicinity of Spring Hill. 



BuUinidus laticinctus was found rather commonly iiear Laudat 

 on the plantain and banana plants. 



In Mr. E. A. Smith's articles, mentioned above by Mr. Pilsbry, 

 there are enumerated thirty-four species of land mollusks inhabit- 

 ing Dominica; of these a few seem to be of doubtful identity, or 

 hardly entitled to specific rank, but there are probably over thirty 

 crood species now known from this island. — G. E. Verrill. 



