248 SMITH : MOLLUSCA OF TRINIDAD. 
45.—Neocyclotus grenadensis (Shuttleworth). 
Cyclotus grenadensts Smith, Proc. Mal. Soc., vol. 1., p. 310, 319. 
46.—Diplommatina occidentalis Godwin-Austen. 
Diplommatina occidentalis Guppy, Ann. Mag. Nat. Hist., 1886 
vol. xvil., p. 385 (name only). 
D. Fluttont Pfr. var. occidentale, Ld., Proc. Sci. Assoc. Trinidad, 
Log. pe24. journo Conch 1502) voli sp ue cer 
D. Fiuttont Pir., Jd., Ann. Mag. Nat. Hist., 1867, vol. xx., p. 95. 
PD. Fluttont Pfr. var. occidentalis Crosse, Journ. de Conch., 1890, 
DP: 55: 
D. Fluttont Pfr., Blanford, Ann. Mag. Nat. Hist., 1868, vol. 1., 
peel mo: 
D. occidentalis Godwin-Austen, Moll. India, p. 173, pl. xlv., f. 
8, 8a, 8b. 
The occurrence in Trinidad of a species of Diplommatina, 
which was identified the same as an Indian species, has given 
rise to considerable discussion as to whether it was not merely 
an introduction by human agency. Notwithstanding the (to 
my mind) conclusive proof given by Mr. Guppy* that this 
Species is indigenous, he still appears to be in doubt, and out 
of respect to the opinions of M. Crosse and Mr. Blanford, con- 
siders it a “var. occidentale” of the Indian shell. 
It is to be noticed that none of the writers quoted have 
offered any comparison between the shells of the two localities, 
but it was presumed to be identical solely upon the word of the 
late Dr. Pfeiffer. 
As the types of D. HYutfoni are in the Museum, and also a 
good series of the Trinidad shell, I am in a position to offer 
the following observations. On a careful comparison, I note 
certain differences, which, although individually small, in the 
aggregate appear to me sufficient to separate the two forms. 
I should, however, remark that, unfortunately, only three speci- 
mens of the Indian species are available. 
*Ann. Mag. Nat. Hist., 1886, vol. xvii., p. 385. 
J.C., vui., Oct. 1896. 
