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. From _venusta_ and _citrina_, Mighels, it varies both in form and color. With some varieties of _picta_ it claims analogy only in the general plan of painting. Its striking characteristics are its blunt apex, slightly rounded whorls, small aperture, short and white columella, umbilicus, and general plan of coloring. A few specimens were collected at an elevation of 7,500 feet, on West Maui, by the Rev. M. Alexander, to whom the species is dedicated.