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Show 1870.] MR. H. ADAMS ON AFRICAN SHELLS. 379 subduplicato, interno brevi, recto, ad marginem columeltarem sub-continuo, externo annulato, expanso. Operc. normale. Diam. maj. 16, min. 14, alt. 9^ mill. Hab. Taiwan, Formosa. 9. MELANIELLA BREVICULA, H. Ad. (Plate XXVII. fig. 12.) M . testa ovoidea, decollata, solidula, longitudinaliter oblique et lineis nonnullis vix elevatis cincta, olivaceo-fusca, interdum fasciata ; spira anfr. superstitibus 3, convexiusculis, impressa ; anfractu ultimo infiato; apertura ampla, pyri-formi, antice producta, testce longitudinis f eequante ; intus ceeru-lescente ; columella callosa, alba. Long. 17, lat. 10 mill. Hab. Amoy, China. 10. DREISSENA SWINHOEI, H. Ad. (Plate XXVII. fig. 13.) D. testa solidiuscula, arcuatim triangulo-cordiformi, nitida, plicis rugosis, irregularibus, concentricis et costis medianis paucis munita, castanea ; apicibus terminalibus, proximis, com-pressis; valvis fastigio umbonali valde elevato, acuto, sinuato ; margine dorsali arcuato, portione ligamentali recta; margine ventrali incurvato, in medio hiante ; intus livescente. Long. 14, lat. 9, alt. 5 mill. Hab. On rocks in the Yangtsze river at Kweifoo, China. 6. Descriptions of T w o N e w Species of African Land Shells. By H E N R Y ADAMS, F.L.S. (Plate XXVII.) L. HELIX (CORILLA) DAMARENSIS, H. Ad. (Plate XXVII. figs. 14, 14a.) H. testa umbilicata, discoidea, solidula, oblique confertissime capil-laceo- slriata, supra albido-fulva, infra albida, ad peripheriam pallide fulvo fasciata ; spira convexa, apice obtuso, sutura impressa; anfr. 6, convexiusculis, ultimo antice soluto, subito descendente, peripheria subcostato-carinato, basi convexo, juxta aperturam compresso ; apertura perobliqua, angulato-circulari; perist. continuo, late expanso, lamina parietali valida intrante et dentibus tribus obtusis profundis ilii oppositis munito. Diam. maj. 9, min. 7, alt. 4 mill. Hab. Damara Land, South-west Africa (Coll. Angas). This species is closely allied to H. sculpturata, Gray, which is from the same locality. 2. ENNEA (GONOSPIRA) RINGENS, H. Ad. (Plate XXVII. fig. 15.) E. testa rimata, fusiformi, ovata, solida, longitudinaliter confertim |
