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30 



LAND AND FRESH-WATER SHELLS OF N. A. [fART II. 



fig. 34. 



SCBGEKtTS RADIX, MOKTF. 



Shell subovate, last whirl ventricose ; aperture more than half 

 the length of the shell, greatly expanded. 



Gulnaria of Leach corresponds to this subgenus, but does not 

 have priority. Klein describes a " Radix Bryonise" as a genus (?) 

 at an earlier date than Montfort published, but I do not acknow- 

 ledge him as authority. He did not use the Linnsean system of 

 nomenclature. H. & A. Adams use Klein's name Neritostoma, 

 but his description and figure refer rather to Succinea, which 

 would prevent the use of the name, even if Klein were authorit}'. 



L.iiunaea ampla, Mighels. — Shell large, much inflated, suboval, 

 rather thin, composed of five convex whirls, prominently shouldered at 

 the upper part ; epidermis of an obscure olivaceous green color ; lines of 

 accretion very fine and compact ; transverse lines 

 obscure, appearing serriform under a magnifier, 

 giving the surface the appearance of very delicate 

 lace work ; suture deep, and in one specimen sub- 

 canaliculate ; spire short and pointed when present ; 

 aperture oblong, very wide at the posterior part, 

 but narrowing rapidly anteriorly and occupying 

 rather more than two-thirds the length of the shell ; 

 labrum thin and somewhat reflected ; labium 

 broadly reflected, forming and partially covering an 

 open and very deep umbilicus ; columella fold very 

 prominent ; within it is of a light yellowish fawn 

 color, with an obscure purplish zone, one line in 

 breadth, and about two lines within the aperture. 

 Length 1.3, breadth 1, height .8 inches. Divergence of the spire very 

 variable. 



Second Eagle Lake, Maine, N. Lit. 47'. 



This extraordinary and beautiful species was discovered by Mr. Alex- 

 ander W. Longfellow, civil engineer, while engaged with other gentlemen 

 of the scientific corps in the exploration and survey of the northeastern 

 boundary, in the summer of 1842. He informs me they were very abun- 

 dant on the shore of the lake, but he had no means of preserving any 

 more than four specimens, all of which are in my collection- No two of 



Limnma ampla. 



