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Show 1867-] MR. H. ADAMS ON NEW MAURITIAN SHELLS. 305 albida; spira cylindrica, apice obtusa, sutura mediocri; anfr. 9, planiusculis, ultimo non ascendente, basi angulato; apertura parum obliqua, rhombeo-ovali, dente parietali compresso, intrante, et plica columellari obsoleta munita; perist. breviter expanso, margine dextro intus labiato, columellari patente. Long. 24, diam. 6 mill.; ap. 6| mill, longa, 4 lata. Hab. The Pouce Mountain, Mauritius. •** The foot of the animal in this species is orange; the mantle is also orange, slightly mottled with black anteriorly, more densely so posteriorly; and the tentacles are black.".-G. Nevill. I have named this species in honour of Mr. William Nevill, the father of Mr. Geoffrey Nevill, a gentleman well known as a mineralogist. GIBBUS (GONIDOMUS) NEWTONI, H. Ad. (Pl. XIX. fig. 8.) G. testa profunde arcuato-rimata, elongato ovata, oblique costata, pallido-lutea ; spira convexo-conica, sutura impressa; anfr. 8, convexiusculis, ultimo antice ascendente, basi, compresso; apertura verticali, truncate-oblonga ; perist. breviter expanso, marginibus callo junctis, dextro intus incrassato, columellari patente. Long. 24, diam. 11 mill.; ap. 7 mill, longa, 6 lata. Hab. Trou-aux-Cerfs, Mauritius. "This species was first found by Mr. Caldwell at Trou-au-Cerf, and I have since found it alive at the same place. The animal has the foot of a greyish flesh-colour, the mantle light brownish grey closely veined with longitudinal dark brown lines, and the tentacles of a dull purple."-G. Nevill. ENNEA (GULELLA) MODESTA, H. Ad. (Pl. XIX. fig. 9.) E. testa profunde perforata, ovato-oblonga, tenuiuscula, conferte et minute costulata, nitida, pellucida, corneo-hyalina; spira ventrosa, sursum tumida, apice convexo-conica, sutura impressa; anfr. 11, convexis, ultimo ascendente, basi rotundato; apertura verticali, ovali, plica compressa oblique descendente prope in-sertionem marginis dextri munita ; perist. expanso, subsoluto, margine dextro sinuato, intus tuberculifero. Long. 5, diam. supra medium 2\ mill.; ap. 1| mill, longa, 1 mill. lata. Hab. Mauritius. This species has hitherto been confounded with E. c/avulata, Lam., but appears to be distinct. Among many specimens that came under the notice of Mr. G. Nevill there was not one of an intermediate form. CYCLOSTOMUS (TROPIDOPHORA) MAURITIANUS, H. Ad. (Pl. XIX. fig. 10.) C. testa anguste umbilicata, ovato-conica, tenuiuscula, pallide fulva, strigis fulvis ornata; spira conica, apice acutiuscula ; anfr. 5, convexis, bicarinatis, inter carinas undique costis irre- PROC. ZOOL. SOC-1867, No. XX. |