. 
GASTEROPODA. 71 
At first sight this would not be distinguished from H. monodon. 
But, besides coming from a different zoological region, it has an im- 
perforate, convex base, like H. hirsuta, instead of the pitted umbilical 
region which H. monodon has, whether perforated or not; and the 
hairs are much more sparsely distributed, being not more than one- 
fourth as numerous. ‘he basal portion is less arcuated, so that the 
aperture is more transversely elongated, and less properly crescentic. 
Figures 40, 40 a, 40 4, three views of the shell, enlarged; 40, natu- 
ral size. 
STREPTAXIS conTusA (Ferussac) Gray. 
Heliz contundata, Ferussac ; Prodr. 30. 
Helix contusa, Frrussac; Hist. des Moll., pl. 31, f. 1; pl. 39 3, f. 2-3. 
Streptazis contusa, Gray ; Loudon’s Mag. N. §., i. 484. 
Animat. Body long and slender, rounded on the back; colour 
bright orange; organs of reproduction remote from each other, the 
male organ being close to the right inferior tentacle, and the female 
organ about midway between that and the respiratory cavity, on the 
same side; oral tentacles bifurcated at tip ; locomotive disk narrower 
than the body. [3s. Pp. c.] 
The animal, as thus described by Mr. Couthouy, is the species above 
mentioned, as far as I have been able to determine. If so, it is inte- 
resting, as showing the animal of this genus, which has not yet been 
known; and that a genus which was founded on a peculiarity of the 
shell alone, namely, its distorted axis, is of real value. It approxi- 
mates to Vaginulus, by the position of its genital organs, its narrow 
locomotive disk, and its forked oral tentacles. 
Figure 70, shell, with the animal ; 70 a, outline of the head, magni- 
fied. 
