| OCR Text |
Show 1892.] SPECIES AND VARIETIES O F D I P L O M M A T I N A . 517 the largest; constriction in centre, above the aperture; aperture widely ovate, vertical, angulate on the lower margin of the columella; the tooth large and well developed; peristome very strong. Size : maj. diam. 1*3 ; alt. axis 2*0 millim. This is another minute shell, differing from all others I have seen in the strong peristome and large columellar tooth. D. delicata is its nearest ally. DIPLOMMATINA SUBRUBELLA, n. sp. Loc. Japvo Peak (Godwin-Austen). Shell dextral, small, fusiform ; sculpture, fine, regular, rather close costulation ; colour pale reddish ; spire high, sides convex, apex blunt; suture impressed ; whorls 6g, sides convex, penultimate and antepenultimate equal; constriction in front, above the peristome; aperture circular, nearly vertical; columellar tooth very small and internal; peristome closely double, not thickened. Size : maj. diam. 1*4 ; alt. axis 2'6 millim. This is a close ally of D. sherfaiensis, but is much smaller and has a coarser sculpture. DIPLOMMATINA SUBTILIS, n. sp. Loc. Margarita (TV. Doherty, in coll. T. H. Aldrich). Shell dextral, elongately ovate, thickened; sculpture, fine, close, regular costulation throughout; colour pale sienna-brown; spire with convex sides, apex blunt; suture impressed ; whorls 6, sides convex, penultimate slightly the largest, the last does not rise much upon the penultimate; constriction in front, but not well marked ; aperture circular, suboblique ; columellar tooth well developed for the size of the shell; peristome double, strong. Size: maj. diam. 1-0; alt. axis 1*5 millim. This is a good species, one of the smallest; its elongated form separates it at once from D.parvula, the finer costulation and larger size from D. minuta. DIPLOMMATINA DELICATA, n. sp. Loc. E. Naga Hills? (TV. Doherty, in coll. T. H. Aldrich). Shell dextral, very small, tumidly fusiform; sculpture, very distant, strong costulation ; colour pale horny ; spire rather depressed, sides convex, apex blunt; suture well impressed ; whorls 6, sides convex, swollen, antepenultimate the largest; constriction above the aperture; aperture ovate, vertical; columellar tooth well marked ; peristome as usual. Size : alt. axis 1*75 millim. There are only two specimens in the collection among those merely labelled Naga Hills, but I have every reason to think they were from near Margarita. |
