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 minute^ elevated conic, thin, smooth, yellowish-green; 

 whorls five, convex ; suture distinct. 



Figure 171. 



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



Turbo minutus, Totten ; Sillimans Jonrn., xxvi. 3G9, 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 tliird 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 

 ^\ inch, breadth -j\ 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 Littorma Bulthica, 



from Copenhagen ; the Turho ulvcc, from England ; and the Paludina 



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



34 



