six Sjjecies of Shells. 347 



portionally longer, — it is also entirely destitute of the re- 

 volving lines, which are seen on that shell. It is the smallest 

 species of the genus that has hitherto been found on the 

 American coast. I first detected it in sifting sand and mud 

 taken from the stomachs of haddock, in the spring of 1842. 

 It is scarce and difficult to obtain. 



Ll.MNEA AMPLA. 



L. testa amplci, subovatA ; anfractibus quinciue, convexis, superne genic- 

 ulatis; sutura vakle irapressa ; spira brevi ; apertura. lata; uinbilico pro- 

 fundo ; columella valdc plicata. 



Plate XVI. Fig. I. a. b. c. 



Shell large, much inflated, suboval, rather thin, composed 

 of five convex whorls, prominently shouldered at the upper 

 part ; epidermis of an obscure, olivaceous green color ; lines 

 of accretion very fine and compact ; transverse lines obscure, 

 appearing seiriform under a magnifier, giving the surface the 

 appearance of very delicate lace work ; suture deep, and in 

 one specimen, (fig. c,) subcanaliculate ; spire short and point- 

 ed 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 ; columel- 

 lar 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 inches, breadth 1 inch, height .8 inches. 



Divergence of the spire very variable. 



Habitat. Second Eagle Lake, Maine, N. lat. 47^. 



Remarks. This extraordinary and beautiful species was dis- 

 covered by Mr. Alexander W. Longfellow, civil engineer, while 

 engaged with other gentlemen of the scientific corps, in the 

 exploration and survey of the north-eastern boundary, in the 

 summer of 1842. He informs me they were very abundant 

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



39* 



