MUSEUM OF COMPAllATIVE ZOOLOGY. 158 



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

 hibiting the last three whorls, grooved within ; body whorl 

 centlv ascendinu iust behind the aperture, and then suddeidy 

 and shortly deliected, very much constricted behind the peri- 

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

 them elevated into a prominent ridge ; aperture subtriangukr, 

 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, 

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

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

 u[ipernii)st pit almost to the inner edge of the body whorl ; low down in the 

 nmuth of the shell there is, Ijetween 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 tlie base of the body wliorl, there is an obli([ue 

 stout, white tooth, wliich 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, h inch ; minor, ^^g inch ; altitude, j inch. 



Eastern Texas. j\Ir. Jacob Boll. 



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

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

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

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

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

 almost entirely unbroken ; in Ilenriettcc 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 vulfunsa ; in 

 Ilenriettcc the two internal teeth are so far within the aperture as to l>e seen 

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

 of the side ; in the latter the parietal tooth is arched ujnrards, 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 are want- 

 ing or olisolete in vultuosa. (Mazyck.) Tlie species is referred to by Mr. 

 Blanil in his "Eemarks," p. IIG. 



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

 F. (iray from the original specimen. As stated above, IMr. Bland and myself 

 formerly considered this as a variety of T. vultuosa. It seems, however, quite 

 as worthy of specific weight as T. Copci. 



Triodopsis loricata, Gocld. (p. 313.) 



Mariposa Co., California. 



