Shell ovately-conic, yellowish horn color, very smooth, finely striate, shining, pellucid; whirls three, nucleus truly mamillate, the last four-fifths of the entire length; aperture elongately ovate; lip simple; columella regularly arched; at the juncture of the lip above, acutely angular.
Remarks on Helix Hillebrandi, Newc.
At the time of publication of this species, but a single recent specimen had been obtained, and that was freed from the epidermis. The statement that the shell was hirsute, was founded upon the cicatrices observed upon the surface, Mr. Gabb, who has recently returned from a trip to Mariposa, was successful in finding a few specimens, by which the diagnosis may be enlarged, and conjecture resolved into certainty. The whole surface is covered with an epidermis, of a yellowish brown colour, thickly studded with slightly curved rigid hairs about one-twentieth of an inch in length. The animal is of a reddish brown color, with the tentacles of a smoky hue; tentacular sheaths darker than the body, which is small, slender, finely granulated and unusually long and tapering behind.
The shell bears the same relations to H. Dupetit Thouarsi, Deshayes, that Helix infumata, Gould, bear to H. fidelis, Gray. In the description of infumata, an important omission occurs, owing doubtless to the imperfect condition of the type specimen. In good specimens, all of the last whirl, except a circle round the umbilicus, is covered with very short and thickly studded soft hairs, feeling harsh when dry, but velvety to the touch when moistened.
Achatinella Alexandri, Newc.
Ach. testa perforata, sinistrorsa, elongato sub-cylindracea, nitida, rufo-brunnea, nigro-elongato-venulato-inosculante picta; anfr. VI convexis, regulariter accrescentibus; apice obtusiusculo; sutura modice impressa, non emarginata; apertura parva, sub-ovata; labro acuto; columella alba breve, sub-recta, truncata, infra in plicam tortam terminante.
Long. ·6 pol., Diam. ·25 pol., Aper. long. ·2 pol. ·1 lata.
Hab. Insula Sandwich, (Maui).
Shell perforated, left handed, elongately sub-cylindrical, shining, reddish-brown, with painting of elongate, inosculating black veins; whirls six convex, regularly (but slowly) increasing; apex a little obtuse; suture moderately impressed, not emarginate; aperture small, sub-ovate; lip acute; columella white, short, almost straight, truncate, terminating by a twisted plait passing within.
This species is more cylindrical than any of its congeners, resembling most A. Renyi, Newc., which is longer, not umbilicate, more pointed at the apex, with a twisted, not truncate columella.