MUSEUM OF COMPAKATIVE ZOOLOGY. 153 



smoother than above ; umbilicus very deep, reaching the apex, but only ex- 

 hibiting the last three whorls, grooved within ; body whorl 

 gently ascending just behind the aperture, and then suddenly 

 and shortly deflected, very much constricted behind the peri- 

 stome, with two deep exterior pits, having the space between 

 them elevated into a prominent ridge ; aperture subtriangular, 

 peristome much thickened within and very slightly reflexed, 

 very tortuous, yellowish white, furnished with a small den- 

 ticle near its upper termination and an erect lamelliform tooth, 

 which is equal in length to about one fifth the diameter of 

 the base of the shell, extending from the lower end of the 

 uppermost pit almost to the inner edge of the body whorl ; low down in the 

 mouth of the shell there is, between this tooth and the denticle, a large white 

 tongue-shaped, concave tooth ; and very near this, but rather lower down in 

 the mouth of the shell, and on the base of the body whorl, there is an oblique 

 stout, white tooth, which is sometimes slightly cleft on the edge. The parietal 

 wall, which is covered with a semi-transparent callus, bears a very strong. 

 arcuated, entering, white tooth, whose outer margins form almost a right 

 angle. 



Diameter, major, ^ inch ; minor,' fa inch ; altitude, J inch. 



Eastern Texas. Mr. Jacob Boll. 



This species more nearly resembles Helix vultuosa, Gould, than any other 

 North American species, but differs from that shell in the shape and size of 

 the umbilicus and in the form and armature of the aperture, which in vultuosa 

 is lunate, almost circular, and in this species is rather V-shaped ; in vultuosa 

 the peristome, though moderately so, is decidedly reflexed, and its plane is 

 almost entirely unbroken ; in Henrietta; it is very much thickened, but scarcely 

 at all reflexed, is very tortuous, and bears on its inner margin an obtuse den- 

 ticle and a long lamelliform erect tooth, which are wanting in vultuosa; in 

 Henrietta; the two internal teeth are so far within the aperture as to be seen 

 only on looking into it, while in vultuosa they arc plainly visible from the base 

 of the side ; in the latter the parietal tooth is arched u/m-rn-il.-*, and its outer 

 margin is rounded ; in Henrietta; it takes the opposite direction, and its mar- 

 gins form almost a right angle; the deep pits behind the peristome arc want- 

 ing or obsolete in vultuosa. (Mazyck.) The species is referred to by Mr. 

 Bland in his "Eemarks," p. 116. 



To the original description of Mazyck I add a figure drawn by Mr. Arthur 

 F. Gray from the original specimen. As stated above, Mr. Bland and my- If 

 formerly considered this as a variety f '/'. mltuosa. It seems, however, quite 

 as worthy of specific weight as T. Copei. 



Triodopsis loricata, GOULD, (p. 313.) 

 Mariposa Co., California. 



