226 GUPPY : MOLLUSCA OF TRINIDAD. 



43. Ampullaria eflfusa Miill. 

 Wood, Ind. Test, Helix, 73. 

 Crosse, 'Journ. de Conch.,' 1890, p. 54, No. 48. 



Crosse gives the names of only two of the globular 

 Ainpullarice, this and the preceding. I have included the 

 name of crocostoiiia Phil, in some of my later lists ; but if 

 specifically distinct from effusa it is a very nearly allied shell. 

 We have many varieties of this type of Ampullaria, and I have 

 given names to some of them, but it is doubtful whether they 

 ought not all to be included under one species. 



44. Cyclotus translucidus Sow. 

 Neocydotus translucidus var. trijiitensis Crosse, 'Journ. de 



Conch.,' 1890, p. 55, No. 49. 



This is not uncommon on calcareous soils throughout the 

 island, except on the hills, where its place is taken by the next. 



45. Cyclotus grenadensis Shuttl. 

 Crosse, I.e., p. 54, No. 50. 



This is more rare than the preceding, and affects higher 

 ground, being found chiefly on the mountains. 



46. Diplomatina button! Pf var. occidentale Guppy. 

 Crosse, I.e., p. 55, No. 51. 



M. Crosse gives the weight of his opinion against the 

 indigenous character of this mollusc, said to be identical with 

 the Indian form. The latest contribution of mine on the 

 question was printed in ' Annals and Magazine of Natural 

 History,' April, 1886, p. 385. M. Crosse's opinion is also that 

 of so able an authority as Mr. W. T. Blanford, and naturalists 

 generally will no doubt take that view of the case, which is that 

 the shell was imported from India. 



47. Truncatella pulchella Pfeiff. 

 Crosse, I.e., p. 56, No. 54. 



J.C, vii., Oct. 1893. 



