250 SMITH : MOLLUSCA OF TRINIDAD. 
53.—Helicina Dysoni Pfeiffer. 
Ff. barbata Guppy, of. cit., p. 228. 
The late Mr. T. Bland* has already pointed out the identity 
of the above species ; but as Mr. Guppyy in his latest catalogue 
has failed to recognise this, I beg to confirm Mr. Bland’s judg- 
ment. M. Crosse,t not having specimens for comparison, 
appears to have been in doubt upon this point. 
54.—Helicina (Poenia) lirata Pfeiffer. 
#1. lamellosa Guppy, op. ci¢., p. 228. 
The synonymy of this species has been fully worked out 
by Crosse and Fischer|| and Martens§ Besides A. untdentata 
Pfr., and A. rusticel/a Morelet, I have no hesitation in uniting 
with the present form the 7. Zame//ata of Guppy from Trinidad. 
The prominence on the basal margin of the peristome is only 
feebly indicated, but the strength of this is variable, being most 
developed in H/. wnidentata. The sub-genus Perenna of Guppy 
is synonymous with Peni H. and A. Ad. 
55.—*Helicina ignicoma Guppy. 
Very near if not the same as //. rugosa Pfr. 
56.—Spherium (Limosina) incurvum (Guppy). 
Cyclas incurva Guppy, op. cit., p. 229. 
Also Guadaloupe (Guppy). 
57.—Pisidium punctiferum (Guppy). 
Cyclas punctifera Guppy, of. cit., p. 229. 
Also Central America (Crosse). 
58.—Anodonta Leotaudi (Guppy). 
Anodon leotaudi Guppy, op. cit., p. 229. 
* Amer. Journ. Conch., vol. iv., p- 179. 
+ Journ. of Conch., vol. vii., p. 228. 
* Journ. de Conch., 1890, p. 58. 
|| Moll. Mexique, p. 397- 
§ Biol. Central Amer. Moll., p. 41. 
J.C., viii., Oct., 1896. 
