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the country, he had arrived at the conclusion that identical species 

 have, in many instances, been described under different names, 

 and that a very considerable deduction ought to be made from the 

 number of species now recorded. The number of species describ- 

 ed by American authors he found to be 18. On these species, he 

 submitted the following statement : 



The original specimens of Cyclostoma marginata and Pupa f al- 

 ias, Say, are identical. 



The original specimen of Mr. Say's P. placida, in the Collec- 

 tion of the Academy at Philadelphia, is Bulimus hordeaceus, of 

 Europe. 



P. ovata and P. modesta, Say, are identical, the latter being an 

 immature stage. In this opinion Dr. Gould coincides. 



P. procera, Gould, is identical with P. rupicola, Say. 



P. curvidens, Gould; P. Tappaniana, Adams ; and P. pentndon, 

 Say, are identical. Thus six of the eighteen species are struck 

 out. Of the twelve remaining species, Dr. B. considered two 

 uncertain, viz : P. simplex, and P. carinata, Gould. 



Dr. Binney further observed that there was another well charac- 

 terized species of Pupa which he had possessed for several years, 

 and which seemed to be very common in the North-Eastern and 

 Middle States, which had not yet been described. It was interme- 

 diate between P. ovata. Say, and P. milium. Gould, having, like 

 them, a heart-shaped or double-curved aperture, the animal also, 

 like theirs, having only two tentacles, and belonging evidently to 

 the genus Vertigo of Muller. He proposes for it a specific name, 

 and describes it as follows : 



P. Gouldii. Testa minuta ovato-cylindrica , sub-castanea ; anfractibus 

 pluiibus quam quatuor, apice obtuso ; apertura sub-caudata, bilobata ; denti- 

 bus quinque armata, labro subreflexo. 



Animal, with two tentacles only. Black above. Foot grey, short pos- 

 teriorly. Shell light chestnut, cylindrical ovate, whorls between four 

 and five, rather ventricose ; the last occupying nearly half the length of 

 the axis ; apex obtuse ; aperture lateral, composed of two unequal curves, 

 meeting in the centre of the outer lip, with five prominent white teeth, 

 viz : one upon the transverse margin, two upon the umbilical margin, and 

 two upon the labial margin ; lip thickened, not reflected ; umbilicus a little 

 open. 



If this species should be received, and the views of Dr. Binney 

 14 



