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Show 298 ON N E W LAND-SHELLS FROM COLOMBIA. [Apr. 5, Long. 21, diam. maj. 7 millim. Hab. Bogota (Mus. Da Costa). A transparent, fragile shell, with very much the appearance of a Glandina. HYALINIA GOMEZI1, n. sp. (Plate XXIII. figs. 5, 6.) Testa perforata, depresso-rotundata, tenuis, pellucida, nitida, fusca, vix striatula ; spira parum elevata, regularis, apice obtusiusculo ; sutura appresso-marginata; anfractus 5, convexiusculi, ultimus non descendens, rotundatus, subtus convexus; apertura transverse lunato-ova/is; peristoma acutum, marginibus distantibus ; columella subverticalis, dente minuto instructa. Diam. maj. 11, min. 9|, alt. 8 millim. Hab. Bogota (Mus. Da Costa). A small hyaline shell, the only remarkable character of which is the presence of a minute tooth or tubercle on the columella. In this and other respects it bears a strong resemblance to some of the Polynesian species of Microcystis, though from its habitat it is probably rightly placed in the genus Hyalinia. CLAUSILIA MAGISTRA, n. sp. (Plate XXIII. figs. 1-4.) Testa magna, anguste fusiformis, solidiuscula, sinistrorsa, nigro-fusca ; spira elongata ; anfractus superstites 7, convexiusculi; costulis obliquis irregulariter undulatis ornati, sutura impressa sejuncti; anfractus ultimus leviter attenuatus, ad basin rotundatus, breviter solutus 3, longitudinis sub cequans; apertura late auriformis, majuscula; peristoma continuum, expansum, non reflexum; lamella superior arcuatim subverticalis, parvi-uscula, subcompressa; lamella inferior obliqua, latiuscula; clausilium tenue, leviter arcuatum ; plicis nullis ; lunella nulla. Long. 38, diam. maj. 7 millim. Hab. Bogota (Mus. Da Costa). A fine large species, elegantly sculptured with irregularly undulating oblique costulae. In form it closely resembles the smaller species, C. epistomium (Pfeiffer), which is found in the same locality. The internal structure presents the somewhat unusual character of being destitute of plicae. CYCLOTUS FILO-LIRATUS, n. sp. (Plate XXIII. figs. 17-19.) Testa late umbilieata, depressiuscula, olivacea, saturate olivaceo-fusco zonata, liris numerosis concentricisfiliformibus instructa; spira levissime elevata ; sutura profunda ; anfractus 5, convexi, 1 Since this paper was read Mr. D a Oosta has called m y attention to the proximity of this shell to a species named by Bland Proserpina swifti, from which it differs in being more convex and in having a much less pronounced tooth on the columella. There is no doubt that the two species belong to the same genus ; but the animals being unknown it is impossible to speak with certainty as to their position. Judging from the shells, however, I think it very unlikely that they belong to the Proserpinidae. The little Microcystis excrescens (Mousson), from Viti Levu (Feejee Islands), has a similar dentiform callus on the columella.-Gh B. S. |