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Show 290 MR. E. A. SMITH ON THE [Apr. 1, volution and the lower portion of the upper whorls ; it is often dotted with white. RISSOA PERFECTA. (Plate XXIII. fig. 42.) Testa brevis, ovata, nitida, pellucida, cornea, supra carinas rufo fusco punctata, imperforata ; anfractus 4, primus Icevis, cceteri superne tabulati, carinis fortibus (in anfr. superioribus 2, ultimo 5) instructi, sutura marginata discreti ; apertura oblique rotundo-ovata, longit. totius \ haud cequans; peristoma con-tinuum, margine e.vterno extus incrassato, columellari leviter reflexo. Longit. 2 millim., diam. 1. This charming little species is at once recognizable by the strong red-dotted spiral ridges. The dots usually fall under one another, forming longitudinal series. RISSOA VARICIFERA. (Plate XXIV. figs. 1, 1 a.) Testa ovato-acuminatct, imperforata, alba, fiavescens vel rufescens; anfractus 5, supremi duo convexi, tenuiter spiraliter lirati, sequentes convexiusculi, sutura profunda sejuncti, carinis spiralibus (in anfr. superioribus 3, in ultimo 7-8) instructi; striis spiralibus sculpti ; apertura parva, ovata, longit. g adcequans; peristoma continuum, margine externo tenui, varice valido pernio remoto instructo, columellari obliquo, anguste reflexo. Longit. 1| millim., diam. |. The little varix at a short distance from the extreme thin edge of the labrum is of a convex swollen character. A series of specimens from Madeira, presented to the British Museum by the Rev. R. Boog Watson, very closely approach this species; they are referred to by him (Proc. Zool. Soc. 1873, p. 374) under the name R. subcarinata. RISSOA PSEUSTES. (Plate XXIV. fig. 2.) Testa ovata, subrimata, tenuis, fuscescenti-cornea, nitida,pellucida anfractus 4, convexi, duo a picnics striis microscopieis spiralibus striati, cceteri fere Iceves, infra suturam rufescentes, distincte marginali; apertura ovata, postice angustata, longit. totius paulo minor; peristoma tenue, continuum, margine columellari rufescente, anguste reflexo. Longit. 1 =| millim., diam. |. This minute species, of which there are four specimens, has rather the look of an embryonic shell. It may prove to be a Jeffreysia. It is very like R. perminima, Watson (? not of Manzoni), Proc. Zool. Soc. 1873, p. 383, but seems rather shorter and has no basal striae. BARLEEIA CONGENITA. (Plate XXI. fig. 25.) Testa solida, obtuse ovato-couoidalis, Icevis, saturate rufa, suturam albo marginata vel macidata, infra medium anfract. ultimi alba ; anfr. 5, convexiusculi, ultimus ad peripheriam obtuse rotunde angulatus ; apertura rotundata, superne leviter |
