MUSEUM OF COMPARATIVE 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, ; inch ; altitude, } 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 Henriette 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 vultwosa; in 
Henriette the two internal teeth are so far within the aperture as to be 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 upwards, and its outer 
margin is rounded ; in Henriette it takes the opposite direction, and its mar- 
gins form almost a right angle; the deep pits behind the peristome are want- 
ing or obsolete in vultwosa. (Mazyck.) The species is referred to by Mr. 
Bland in his “Remarks,” 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 myself 
formerly considered this as a variety of 7. vultuosa. It seems, however, quite 
as worthy of specific weight as T. Copei. , 
Triodopsis loricata, Goutp. (p. 313.) 
Mariposa Co., California. 
