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Show 316 MR. H. ADAMS ON NEW FORMOSAN SHELLS. [May 22, 4. Descriptions of Fifteen New Species of Land and Freshwater Shells from Formosa, collected by Robert Swinhoe, Esq., Consul at Taiwan in that Island. By H E N RY A D A M S , F.L.S. (Plate XXXIII.) 1. NANINA (ACUSTA) ASSIMILIS, H. Ad. (PL XXXIII. fig. 1.) N . testa aperte umbilicata, depressa-globosa, tenui, irregulariter striata et confertissime leviter decussata, subpellucida, nitida, pallide fulva; spira subconica, obtusa; anfr. 5%, convexiusculis, ultimo ventricoso; apertura lunato-circulari; perist. simplici, acuto, margine columellari arcuato, dilatato, ad umbilicum reflex-iusculo. Diam. maj. 22, min. 18, alt. 15 milL Hab. Takow, Formosa (Mus. Brit.). This species much resembles N. sieboldtiana, but is more widely umbilicated, more depressed, and of a lighter colour. 2. HELIX (PLECTOTROPIS) FULVICANS, H. Ad. (PL XXXIII. fig. 2). H . testa umbilicata, trochiformi, tenuiuscula, oblique leviter striata, et liris spiralibus tenuissimis decussata, breviter pilosa, pallide fulva; spira conoidea, acutiuscula, sutura simplici; anfr. 6|, subplanatis, ultimo subacute carinato, antice descendente, basi convexiore; apertura obliqua, subrhombea; perist. tenui, margi-nibus convergentibus, dextro expanso, antrorsum subsinuoso, columellari per acuto, reflexo, umbilicum non claudente. Diam. maj. 11, min. 10, alt. 9. Hab. Tamsui, Formosa (Mus. Brit.). 3. HELIX (CAM^NA) BAIRDI, H. Ad. (PL XXXIII. fig. 3.) H . testa umbilicata, turbinato-depressa, solida, obliqueplicato-striata, fulva, fascia peripherica nigro-castanea luteo-marginata ornata; spira breviter conoidea; anfr. 6, convexiusculis, lente accrescen-tibus, ultimo antice descendente, umbilico mediocri pro/undo; apertura diagonali, auriformi-lunari; perist. fusco-carneo, expanso et breviter reflexo, marginibus remotis, utrinque in medio fiexuoso et obsolete tuberculato, externe indentato; margine columellari dilatato. Diam. maj. 41, min. 36, alt. 23 mill. Hab. Tamsui, Formosa (Mus. Brit.). 4. HELIX (CAM^NA)SUCCINCTA, II. Ad. (PL XXXIII. figs.4,4a.) II. testa umbilicata, conoideodepressa, solidula, oblique striata, lineis spiralibus rugosis irregulariter decussata, luteo-fulva, fascia peripherica pallido-marginata ornata; spira conoidea; anfr. 6, convexiusculis, ultimo antice vix descendente, obtuse carinato, basi compresso; umbilico angusto, interdum intus cas- |
