1893.] NATURAL SCIENCES OF PHILADELPHIA. 263 



cyclophorella (Man. Conch., PI. 33, fig. 30). Diam. 2*6-2-8 mm. 

 It is a form decidedly different from the type, but, as it seems, con- 

 nected by intermediate specimens.. 



Pyrenees (Acad. Coll.; see under V. perspediva, p. 271). 



V. costata var. montana, n. 



Shell rather small and thick, colorless translucent, a little opaque, 

 spire a little elevated ; surface with rather crowded rib-strire, but 

 without membranous ribs ; last whorl slightly and gradually ascend- 

 ing, not at all or very little descending to the aperture in toto, 

 shortly and decidedly at the suture ; lip very strong. 



There are two specimens, not quite fresh, in the Acad. Coll., 

 marked " H. mimda Say, Rocky Mts., E. Hall," with the above 

 characteristics. They cannot be ranged under typical costata, yet 

 they have the general appearance of that species, so that they may 

 be placed as a variety under it until more and better specimens are 

 obtained. 



6. V. albula u. sp., PL VIII, figs. D and 0. Man. Conch. PI. 33, figs. 48, 49. 



About the middle of Nov., 1892, Mr. A. W. Hanham sent me a 

 third lot of fresh Vallonia from St. Joseph, Quebec,' 24 Canada. 

 Among them were four beautiful examples, three of them living, 

 which I first somewhat doubtfully referred to V. gracilicosta. After 

 repeated comparison I find that they differ essentially from this 

 species. I cannot, with certainty, range them under any other. 



The shell is rather large, 2"7-2"8 mm. gr. diam., whitish translu- 

 cent, with a somewhat elevated spire; whorls 3j-4 ; the last 

 wdiorl and aperture are rather well rounded, the latter resembling 

 that of costata. The lip is moderately strong. The ribs of the shell 

 are distinct but small, crowded, about 55 on the last whorl, and 

 bearing fine membranes which give the surface a beautiful silky 

 gloss as in some cyclophorella. There are differences in the eleva- 

 tion of the spire and the ascending of the last whorl among the 

 four specimens, as is the case in most other forms. 



In outer aspect the soft parts are much like those of other species. 

 The liver is pale yellowish or horn colored. The jaw and especially 

 the radula show some peculiarities, both being comparatively large. 

 The jaw is 0"31 mm. wide, of pale horn color, and appears some- 



24 Mr. Hanham's assiduous collecting brought to our knowledge four different 

 Vallonia from the vicinity of Quebec: pulchella, excentrica, costata, and the one 

 under consideration. 



