OCR Text |
Show 646 DR. J. COX ON NEW LAND-SHELLS. [Nov. 7. nally at the angle of reflexion; margins approached, columella dilated, adnatc. Diam., greatest 1*00, least 0*80; height 1*08 of an inch. Hab. Guadalcanar Island, Solomon Islands. The characters of this species correspond very closely with those given by Pfeiffer to Helix fiexilabris; but 1 consider there are sufficient points of distinction to regard it as a new species; it is a less conical shell, and the last whorl is much more inflated. HELIX SELLERSI, sp. nov. (Plate LII. fig. 9.) Shell imperforate, trochiform, brownish yellow, generally ornamented with two very dark chestnut, almost black, bands, more or less wide, one above and one below the subcarinated periphery of the last whorl, having sometimes between them an opaque white band ; transversely rather regularly striated backwards, decussated from behind forwards by rather irregular, slightly waved, proportionally broadly separated strise, more distinct on the last two whorls than at the apex of the spire ; whorls 5, rounded, gradually increasing in size, suture impressed, last whorl sharply depressed at its termination and flattened from the periphery to its insertion ; spire obtuse; aperture ovately lunate ; peristome white-margined, slightly everted ; columella very slightly dilated and adnate. Diam., greatest 0*78, least 0*56 ; height 0*60 of an inch. Hab. Guadalcanar Island, Solomon Islands. HELIX COMPLUVIATUS, sp. nov. (Plate LII. fig. 10.) Shell with a very narrow, deep umbilicus, discoid, flat above, rounded below; spire only slightly raised, covered with a glossy corneous epidermis of a dark claret-colour above, pale below ; whorls 6, slowly increasing in size, last not depressed in front, suddenly descending at the periphery, before descending being grooved with a narrow deep gutter continuous above the margin of the suture almost to the apex; aperture angularly lunate; peristome simple, thin, angled and notched above the middle by the termination of the groove; margins rather distant, columellar margin very slightly dilated and everted. Diam., greatest 1*10, least 0*88 ; height 0*70 of an inch. Hab. Solomon Islands. HELIX HUNTERI, sp. nov. (Plate LII. fig. 11.) Shell with a moderately large, deep, open perforation, globosely turbinate, thin, pale flesh-coloured, obliquely finely striated from above downwards, and longitudinally striated, especially on the second and third whorls, with coarser granose stria.; whorls 4|, rounded; spire depressedly conoid, apex obtuse, last whorl inflated, (partially) carinated below the middle, the line of carination being opaque or cretaceous ; aperture slightly angled and elongately lunate; peristome thin, broadly reflexed, margins slightly approached, columellar margin triangularly dilated, overhanging and produced beyond the umbilicus. Diam., greatest 1*08, least 0*92; height 0*86 of an inch. |