| OCR Text |
Show 1892.] SPECIES AND VARIETIES OF DIPLOMMATINA. 519 DIPLOMMATINA SUCCINEA, n. sp. Loc. Anghami Naga Hills (Godwin-Austen). Shell dextral, tumidly fusiform, thin and delicate in texture ; sculpture, regular, rather close costulation ; colour very pale amber, with stronger coloration on the apex; spire somewhat depressed, suture impressed ; whorls 6, tumid, with convex sides ; constriction above the aperture ; aperture oval, vertical; columellar tooth only indicated by a slight swelling; peristome double, strong. Size : maj. diam. 1*3 ; alt. axis 2*0 millim. This minute species may be compared with D. parvula from the N. Khasi Hills, from which it differs in being larger, and in having a greater number of whorls and a much more tumid shape. DIPLOMMATINA CONCINNA, n. sp. Loc. Naga Hills, probably south of Margarita (Doherty, in coll. T. H. Aldrich). Shell dextral, solid, fusiform ; sculpture, very strong, rather distant costulation ; spire tapering rapidly, apex acuminate; suture impressed ; whorls 7, sides convex, penultimate and antepenultimate about equal in size; constriction hardly apparent, just above the aperture; aperture circular, vertical; columellar tooth quite minute, only an indication of it; peristome double, strongly developed. Size: alt. axis 1'6 millim. This is very distinct from any of the minute species I have hitherto examined from this part of India; it is distinguished by its thick shell and strong costulation. Sinistral species. DIPLOMMATINA GIBBEROSA, n. sp. Loc. South of the Barak River between Munipur and Imphal ( Godwin-Austen). Shell sinistral, ovately fusiform; sculpture, very distant fine costulation, 9 ribs on the antepenultimate whorl when viewed from the front; colour very pale greenish ; spire low, sides rounded, apex blunt; suture very impressed ; whorls 4|, very swollen, sides very convex, penultimate much the largest; constriction on penultimate in centre above the aperture ; aperture oval, subvertical; peristome double, strong ; columellar tooth small, internal. Size : maj. diam. 1*5 ; alt. axis 2*2 millim. The nearest ally of this species is D.jaintiaca, G.-A., figured in the J. A. S. B. vol. xxxviii. pi. iii.; it differs, however, much in form, particularly in the expanded penultimate whorl and in its very distant sculpture. A very large number of it were collected in the above-named locality, and a single example at Prowi in the Lahupa Naga country. In the collection sent m e by Mr. Aldrich in a box marked Naga Hills were about 40 specimens of this shell. The exact locality |
