INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 659 



middle, the cost?e vanishing at the angulation ; the base is covered with 

 numerous microscopic revolving lines ; on the body-whorl there are two 

 revolving bands of pale brown, one above and one below the angulation. 

 Aperture long ovate, acute posteriorly, alittle angulated on the outer side, 

 rounded and slightly prolonged anteriorly. Outer lip thin and sharp, 

 round and slightly effuse anteriorly ; columella smooth, nearly" straight, 

 but scarcely forming an angle where it joins the outer lip. Length, 

 4mm. breadth, 1.5""^\ 



Somewhat resembles T. interrupta, but the costse are more crowded, 

 the spiral lines are very much finer and more numerous, and the 

 nuclear-whorl is much larger. 



Long Island Sound, near Kew Haven, Conn. 



TuEBONiLLA STRICTA Ycrrill, sp. nov. 



Shell white, subulate, very acute, with a very minute reversed apical 

 whorl ; whorls ten, besides the nucleus, gradually and regularly enlarg- 

 ing, flattened or only very slightly convex, crossed by straight, obtuse, 

 transverse costee, of which there are about sixteen or eighteen on the 

 lower whorls ; the two upper whorls are nearly smooth ; suture im^ 

 pressed. Aperture irregularly oblong-ovate, acute posteriorly, rounded 

 anteriorly ; outer lip flattened, thickened internally, in mature shells, 

 and minutely crenulate within ; columella smooth, nearly straight, 

 thickened, forming an angle where it joins the outer lip. Length, 4.5"^™ ; 

 breadth, 1'"°^. 



Long Island Sound, off New Haven, Connecticut. 



This is probably the shell recorded from this region as T. nivea (Stimp- 

 son, sp.) by Dr. G. H. Perkins. It differs from the nivea in the form of 

 the aperture and lip, and in being smaller and much more acute, though 

 having the same number of whorls. 



TURBONILLA EQUALis YerriU. 



Tarritella cequalis Say, Journal Acad. Nat. Sciences, vol. v, p. 208, 1826 ; Biu- 

 ney's Say, p. 119. 



" Shell subulate, white ; volutioas ten, each with about twenty-two, 

 transverse, elevated, obtuse, equal lines, with interstitial grooves of 

 the same diameter 5 suture distinct, impressed ; aperture rounded at 

 base, and destitute of any distinct emargination. Length one-fifth of 

 nn inch.*' (Say.) 



My specimens agree well with the above description. The shell is 

 very slender and acute, with a small distinctly reversed apical whorl j the 

 remaining nine whorls are somewhat flattened, and all are crossed by 

 obtuse, transverse costse, which are a little oblique, especially at the 

 upper ends, close to the sutures 5 on the body-whorl there are about 

 twenty, but fewer on the upper ones; at the base of the body- whorl 

 they vanish, leaving it smooth ;. the interstices between the costse are 

 deep and apparently smooth. The aperture is round ovate, well rounded 

 or sub-circular anteriorly; the inner lip having a raised and thin 



