OCR Text |
Show 736 LIEUT.-COL. GODWIN-AUSTEN AND MR. NEVILL O N [Dec. 2, common in similar ground in the nearest known countries, Tenasserim and Penang." I have deemed it best, considering that only two specimens were found, and that they are so similar in general form to immature specimens of Ennea stenopylis, Bs., from the Khasi hills, not to found this new subgenus until further examples are obtained proving that the shell as given in the Plate is a mature form ; and I trust Mr. Nevill will pardon this caution on my part (G.-A.). N A N I N A (MICROCYSTINA) TOWNSENDIANA, n. sp. (Plate LIX. fig. 1.) Testa minutissima, N. minimse (H. Adams, P. Z.S. 1869), a me detectee, affinis ; vix rimata, planiuscula, vitrea, nitida et anfract. 4\, perlente crescentes, sutura impressa sejuncti, ultimo majore, prope aperturam vix dilatato, ad peripheriam rotundato, basi convexiusculo ; apertura minima, angusta, margine columellari perobliquo vix descendente. Alt. i (prox.), diam. 1 (prox.) mill. (G. N.) A small and almost microscopic form, which I obtained by washing larger shells found by Dr. Townsend in the Buket Pondong Cave. It belongs to a group which appears to m e to abound nearly everywhere in the Indo-Malay Province, but which has hitherto been almost universally neglected, on account of the small size, and ah- * sence of marked sculpture and coloration, which characterize these shells. Species have nevertheless been described by M M . Issel (from Borneo), Martens, Semper, and Morch (Eastern Archipelago), Benson (India and Burma), Morelet and H. Adams (Mascarene I.), &c. I have not any books by me for reference ; but I am almost confident that it was for a species of this group that Morch, Journ. de Conchyl. for 1872, formed a new subgenus " 3Licrocystina" (as distinct from the sculptured 31icrocystis, of Beck), with N. rinkii, Morch, from the Nicobar Islands, as his type ! 3Iicrocystina seems to m e to bear somewhat the same relationship to the larger and closely allied mollusks known as Macrochlamys, that the European species of Vitrea (of Fitzinger) do to Hyalina (G. N.). M . Crosse has described ' a new form from the same locality, H. (Geotrochus) perakensis. CLAUSILIA? juv. (Plate LIX. fig. 8.) Another young shell figured, which I doubtfully refer to the above genus (G.-A.). Perak. (Indian Museum, Calcutta.) P U P I S O M A ? sp. juv. (Plate LIX. fig. 7.) This shell I have figured although young, it being often of importance to know the immature forms, which so puzzle a conchologist when sorting out a collection. It probably belongs to the above subgenus of Stoliczka (J. A. S. B. 1873, p. 32). Alt. -045 inch. (G.-A.) Perak. (Indian Museum, Calcutta.) 1 Journ. de Conchyl. t. xix. p. 199, pi. viii. f. 4. |