TURBINACEA. MOLLUSCA. CINGULA. 265 



not thickened," to which I would restrict the genus Ci'ngula, 

 and which seem also to constitute the genus Hydrubia of 

 Hartmann, judging merely from references made to it. 



Ci'ngula minuta. 



Shell mimite, elevated conic, thin, smooth, yellowish-green; 

 whorls Jive, convex ; suture distinct. 



Figure 171. 



State Coll., No. 37. Soc. Cab., No. 1365, 



Turbo minutus, Totten ; Silliman's Journ., xxvi. 369, f. 7. 



Shell minute, ovate-conic, elevated, obtuse at apex, thin, yel- 

 lowish-brown, or dark horn-color when containing the animal ; 

 usually coated with a dark-green pigment, or some minute vege- 

 table ; whorls five, convex, faintly wrinkled by the lines of 

 growth, the two upper ones forming an obtuse apex, and the low- 

 est less than two thirds the whole length of the shell ; suture dis- 

 tinct, with a slight shoulder to the whorl near it ; aperture about 

 one third the length of the shell, oval, the lips united in mature 

 shells by a loosely attached enamel, which rises before an umbili- 

 cal pit ; operculum horny, sub-spiral. Length of large specimens 

 ■j^o inch, breadth -^\ inch, divergence 28°. 



Animal. Head proboscidiform, dusky-brown, or blackish, 

 half as long as the black-tipped tentacula ; eyes on a partial ped- 

 uncle or dilatation on the exterior base of the tentaclula ; region of 

 the mouth, the tentacula, and a stripe each side of the neck, leav- 

 ing a pyramidal dark line between, of a light drab-color ; foot 

 oval, bifid, and dilated into wings before, rounded behind, dusky 

 above, and pale beneath. Motions very active. 



Found plentifully on sea-weed, and on moist banks, about high- 

 water mark, especially on the thread-like plants which grow in 

 ditches and brackish pools about marshes, in company with Litto- 

 rina tenebrosa. 



It is closely allied to several species received from Europe, and 



perhaps identical with some one of them ; as the Litlorlna Bdlthica, 



from Copenhagen ; the Turbo ulvce, from England ; and the Paludina 



thermdlis, from France. But, as the shell has been submitted to Mr. 



34 



