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Show 1875.] MR. R. J. L. GUPPY ON HELIX COACTILIATA. 321 Cyclotus translucidus, Sow. Venezuela. Helicina barbata, Guppy. Carupano (Venezuela). lamellosa, Guppy. Venezuelan Guiana. When these nine species are added to those contained in the first list, we have twenty-five as the number of species ascertained to be common to Trinidad and the adjoining continent. The list of species remaining as peculiar to Trinidad, so far as is yet known, includes the following :- Glandina minutissima. Ancylus textilis. Spiraxis simplex. Gundlachia crepidulina. Zonites implicans. Planorbis meniscus. umbratilis. Amnicola spiralis. Hyalina alicea. Diplommatina huttoni. Helix ceeca. Blandiella reclusa. Bulimus pilosus. Cistula aripensis. Bulimulus aureolas. Helicina nemoralis. Pupa uvulifera. ignicoma. Simpulopsis corrugatus. Cgclas punctifera. Amphibulima felina. Anodon leotaudi. This list contains the names of twent\--two species. To it might be added Stenogyra coronata and Pupa auriformis; but as hitherto only a single specimen of each has been found, they may be regarded as doubtful; and the same reason may be given for leaving out Autono'e riparia. On examination of this list the number of really peculiar forms seems to be very few. Many of the shells whose names are here included are minute, and most occur only in very restricted localities ; so that even if existing in the Antilles or on the continent they might easily have escaped notice. Glandina minutissima is perhaps the smallest of all known land-shells, unless Achatina iota of Adams (to which our species seems to be allied) should prove to be less in size. Spiraxis simplex is akin to some of the plainer forms of Spiraxis found in the West Indies. The two Zonita are minute. Hyalina alicea may prove to be a Macrocyclis, as has happened in the case of H. concolor (baudoni). Bulimus pilosus is allied to B. constrictus, a Venezuelan shell, of which a variety is described in a note communicated by m e to the Society. Pupa uvulifera is a small species belonging to a type of world-wide distribution. Simpulopsis is a South-American genus, having one or two species in the Antilles. It is probable that S. corrugatus will be found in Venezuela, if indeed it is not identical with one of the species already described from South America. Amphibulima (Omalonyx) felina is very close to, if not identical with, O. unguis of Guadeloupe. There is some doubt about the identity of the latter with the South-American O. unguis. Of Ancylus textilis, Gundlachia crepidulina, and Planorbis meniscus it may be said that they will probably be found in South America on search ; and Amnicola spiralis may be placed in the same category. Furthermore the latter is not easy to distin- PROC. ZOOL. Soc-1875, No. XXI. 21 |