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NOTES ON CERTAIN TYPES OF AMPULLARIA IN THE TARIS 

 AND GENEVA MUSEUMS. 



By G. B. SowKRBY, F.L.S. 

 Read lUh June, 1909. 



Since reading my paper on the Western forms of the genns Ampullaria, 

 I have visited the Paris and Geneva Museums, and through the 

 kindness of Dr. Louis Germain, Professor Bedot, and M. de Lessert 

 have been able to identify from the actual types some of the species 

 concerning which I was previously in doubt. 



In the Geneva Museum I found the collections of Delessert, 

 Bourguignat, Brot, Moricand, and most of Lamarck's Gastropoda. 

 Among the latter I was pleased to be able to fix definitely the 

 following species, which has long been misrepresented by various 

 authors, and which, in my last paper, I confessed myself unable to 

 identify. 



Ampullaria canaliculata, Lamarck. 



This shell measures 2-i-o- inches long by l-i% inches wide; its spire 

 is small and conical, from a front view showing about 3 J whorls above 

 the high obtusely rounded shoulder ; it is deeply and rather broadly 

 channelled at the suture. The body- whorl is rather square and nearly 

 vertical, not oblique as in most allied species. The substance of the 

 shell is thicker than that of A. (jigas; its surface is lustrous, posterior 

 smooth, anterior plicately striated. Philippi's A. W Orhignyana is 

 the same, only the spire is more immersed. A. haustnmi, Amazonica, 

 and immersa of Reeve (which I regard as one species) may possibly 

 merge into this, but at present it seems to me sufficiently distinct. 

 A. insulanim, D'Orbigny {= vermiformis, Reeve), is another allied 

 species, but much more oblique, more solid, and with a rougher 

 surface. 



Ampullaria Guianensis, Lamarck. 



I now find that Reeve's A. crgthrostoma is identical with it, and 

 A. Immadoma of the same author is a stunted form of the same. 



From Bourguignat' s collection I made a number of notes concerning 

 liis African species, but I propose to embody these in my next paper 

 dealing with Pila and Lanistes. In the Paris Museum I found 

 several of Crosse & Fischer's types previously unknown to me, the 

 principal result of which is to add the following to the already very 

 considerable synonymy of A. Hopetonensis, viz., A. Belizensis and 

 lemniscata, C. & F., both from Belize, Mexico, and A. oeclusa, C. & F., 

 from Tanesco, Guatemala. On seeing the type of A. Petiti, Crosse, 

 I now think it distinct from A. impervia, Phil. It is a much larger 

 shell, with a very elately conical spire, and the peristome very thick, 

 ptarticularly at the base ; its colouring also is different, being destitute 

 of the peculiar cloud-like blotches characteristic of A. impervia, and 

 particularly of its variety nuhila. 



