VITRINA. 



27 



Fig. 23. 



Vitrina 

 limpida. 



suture not much impressed, sometimes witli an impressed line revolving 

 near it ; aperture large, subovate, somewhat diminished by the 

 intrusion of the penultimate whirl ; peristome thin and acute, 

 the columellar margin a little reflected ; axis imperforate. 

 Greatest transverse diameter nearly 6 mill, 



Vitrina pellucida, DeKay, N. Y. Moll. 25, pi, iii, f. 42 (1843), 



not of MiJLLER. — Adams, Sh. of Vt. 1G2. — Bixxey, T. M. 



II, 58, pi. Ixvii, a, f. 1. 

 Vitrina atnericana, Pfeiffer, Dec. 1852, Proc. Zool. Soc. 156, Chemnitz 



ed. 2, 9, pi. i,f. 22-25 (1854). 

 Vitrina limpida, Gould, in Agassiz' Lake Superior, p, 243, 1850 ; Terr. 



Moll, l. c. — Pfeiffer, Malac. Blatt. II, 10 (1856) ; Mon, Hel. Viv. 



IV, 798— W. G, BiNSEY, T, M, 33.— Reeve, Con. Icon. 62.— Mokse, 



Journ. Portl. Soc. I, 11, pi. v, f. 17 (1864) ; in Amer. Nat. I, 314, f. 



20 (1867).— Tryon, Am. Journ. Conch. II, 243, pi. iii, f. 1 (1S66). 



Found in Maine, Yermont, New Brunswick, and to the north- 

 west of Lake Superior. An accidentally introduced colony has 

 lately been found by Dr. Lewis, at Mohawk, N. Y. 



Animal whitish, grayish, or blackish, large compared with the 

 shell. Head, eye-peduncles, and eyes black ; tentacles very short. 

 The prolongation of the mantle extends from under the shell, over 

 the back and neck to the base of the eye-peduncles, but is un- 

 attached and free ; from the right side of the mantle posteriorly, 

 there arises a tongue-shaped process, which is reflected back upon 

 the shell, and reaches to the spire. Respiratory foramen in the 

 posterior part of the mantle. 



Lingual membrane with 90 rows of long, slender teeth, fifty- 

 one teeth in each row (25—1—25) ; centrals tricuspid ; laterals 



Liugual dentition of V. limpida. [Mokse.] 



bicuspid, in straight transverse rows ; laterals thorn-shaped, some- 

 what curved, with two acute points, in curving transverse rows, 

 becoming smaller as they pass off laterally. 



No. of Sp. 



Locality. 

 Portland, Me. 



From whom received. 

 T. Bland. 



