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Show 278 MR. E. A. SMITH ON THE [Apr. 1, merely as a subgenus of Mathilda." It certainly either is or is not the same ; and presuming them to be identical, Cingulina must be retained, having been published five years previous to Mathilda ; but should it be considered that they differ sufficiently in sculpture to be placed in different sections, Mathilda and not Cingulina should take subs;eneric rank. 1 have this advantage over Mr. Watson in knowing that the character of the apical whorls is the same in both, as one of the specimens of Cingulina circinata in the Museum still retains its nucleus. The sculpture of this species, the type of the genus, is certainly very unlike that of most of the known species of Mathilda, consisting of strong spiral ridges, with only feeble lines of growth in the interstices. C. spina of Crosse and Fischer is very closely related, but quite distinct. Owing to the more cancellated surfaces of Mathilda, it may be convenient at present to retain it as a section or subgenus. ODOSTOMIA GLAPHYRA. (Plate XXIII. fig. 23.) Testa ovato-cylindracea, albo-pellucicla; anfractus 5-6, apicalis convexus, involutus, cceteri parum convexi, Iceviqati, sutura mediocriter profunda, vix obliqua, sejuncti, ultimus penult. latitudine subcequans; apertura parva, inverse auriformis, longit. totius g subcequans ; columella plus minus leviter con-torta, in exemplis adultis callo tenui labro juncta. Longit. 2-j millim., diam. 1. Although under an ordinary lens this species appears to be smooth, it is in fact finely spirally striated. It is sufficiently pellucid to allow of the columella being indistinctly visible up the spire, the apex of which is large and obtuse. EULIMA FUSCESCENS. (Plate XXIII. fig. 24.) Testa parva, acuminata, recta, pallide fuscescens, polita ; anfractus octo, levissime convexi sutura simplice vix obliqua sejuncti, ultimus ad medium magis convexus, mediocriter elongatus ; apertura ovata, superne acuminata ; perist. tenue, inferne leviter effusum, margine columellari paulo reflexo, superne callo tenui labro juncto. Longit. 2\ millim., lat. fere 1 ; apertura f longa, \ lata. This little species is peculiar on account of its colour" a rare feature in this genus, and its short erect form. EULIMA ATLANTICA. (Plate XXIII. fig. 25.) Testa nivea, elongata, aut recta aut superne plus minus dextrorsum vel sinistrorsum curvata; anfractus 11-12, fere plani, sutura levi sejuncti; ultimus in medio curvatus, subbrevis ; apertura parva, ovata, superne acuminata ; columella paulo incrassata, refiexa, labro callo tenui juncta; labrum in medio prominens, prope suturam haud profunde sinuatum. Longit. 7j millim., diam. 2; apertura 2 longa, 1 lata. This species has a less slender spire than.E'. intermedia, Cantraine, is of a shorter and stumpier growth, and the reflection of the colu- |