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Show 1879.] SHELLS FROM PERAK AND THE NICOBAR ISLANDS. 735 found by future naturalists who may visit the country with more leisure than Dr. Townsend could give during the progress of a military expedition. The thanks of all interested in malacology must be given him for the interesting new forms he has made us acquainted with. The Nicobarese shells were collected by Dr. Ferdinand Stoliczka, and were among the large and valuable collections which he bequeathed to the Indian Museum, Calcutta. ENNEA PERAKENSIS, n. sp. (Plate LIX. fig. 2.) Testa parva, viridescenti-crystallina, nitida, solida; spira paululum elevata, trochiformis, profunde et aperte umbilicata in modo "solariformi" dicto, apice obtuso atque leevi; superne elegantissime regulariterque transversim sulcata, sulcis pervalidis, planiusculis subrectisque (vix flexuosis) ; anfractu tertio sulcis confertis, ultimis duobus sulcis cequalibus atque distantibus ornatis ; subtus ad basin subplana, circa umbilicum subcarinata, prope periphe-riam sulcis validis subito fere evanidis, in umbilico rursus patentibus; anfract. 5, convexiusculi, ultimo basi piano; apertura perfecte quadrangularis, dentibus 4 coarctatis, dente parietalipercrasso, oblique contorto, conspicue prominent e ; perist. album, incrassatum, marginibus subparallelis, fere rectis, margine externo inferne dente parvo munito et ad basin abrupte angulato, margine basali cum dente, paululum majore, in medio munito, margine columellari superne callositate levi ad dentem parietalem juncto, reflexo et paululum obliquo, inferne acute angulato et valido munito. Alt. If, diam. 2 mill. The other specimen measures, alt. Ii, diam. 1| mill. (G. N). I obtained two fine specimens of this remarkable new species, by washing the larger shells obtained by Dr. Townsend in the Buket Pondong cave. I know of no shell which surpasses it in interest, as regards sculpture: the apical two whorls are smooth, the next closely, transversely sulcated, and the last two very conspicuously distantly so ; the " sulci " are almost upright, only slightly flexuous, with their interstices about twice as broad as themselves; underneath, the base appears beautifully fimbriated near the margin, owing to these sulcations apparently suddenly stopping a short distance from the periphery, though in reality one can trace them across the base; but to do so requires the lens and a good light. To all appearance the middle of the base is smooth, polished and shining. These sulcations appear again within the deep, open, and solariform umbilicus, as conspicuous as ever. The characters of the aperture &c. are so excellently represented in Colonel Austen's figure, that it would be a waste of time to further describe them (G. N.). From the peculiar form of this shell, Mr. Nevill considered it a new subgenus of Ennea ; and following his description of it he says :- " It is of interest to note that, in the very extensive collection made by m y friend Dr. Townsend in these caves, there was not so much as a broken piece of any species of Streptaxis or Ennea, both so |