Zoological Society. 69 patterns presented by those recent Avicula that inhabit shallows and moderate depths. Aviculo-pecten intercostatus and elongatus also exhibit markings. Spiri/er decorus and Orthis resupinata, show fine radiating white lines. Terebratula hastata, with radiating stripes. The analogy of any existing forms that can be compared with those enumerated, would lead to the conclusion that the markings in these instances are characteristic of mollusks living in a less depth of water than 50 fathoms. In the case of the TerebratulUj which belongs to a genus the majority of whose living representa-tives inhabit deep water, it may be noticed that all the living spe-cies exhibiting striped shells are exceptions to the rule, and come from shallow water. There are many circumstances which warrant us to suspect that the carboniferous mountain limestone of most regions was a deposit in shallow water. The facts now adduced materially strengthen this inference. In the British Museum there is a beautifully spotted example of a Devonian Terebratula, brought by Sir John Richardson from Boreal America. Specimens of the Turbo rupestris] from the Lower Silurian Lime-stone of the Chair of Kildare near Dublin, exhibit appearances that seem to indicate sj)iral bands of colour. . ZOOLOGICAL SOCIETY. November 9, 1852.— J. S. Bowerbank, Esq., F.R.S., in the Chair. Descriptions of a new genus, and of several new species, of mollusca, from the cumingian collection. By Arthur Adams, F.L.S. etc. Family Solenellid^. Animal oblong. Mantle open in the entire length ; margin double, outer edge fimbriated ; hind outer edge ending in two cal-lous conical processes immediately below the respiratory orifice. Respiratory orifice continuous with the opening of the mantle, the margin fringed ; anal siphon simple-edged, tubular, elongate, muscu-lar, produced beyond the fringed mantle-margin which surrounds its base. Gill single on each side, attached the whole length. Labial palps elongate, fringed at their margins, and surrounded at their base by a thin dilated membrane. Foot large, compressed, geniculate, ending anteriorly in a folded ovate disc with crenate margins. Shell thin, not pearly within. Hinge-margin with comb-like teeth. Ligament external. Genus Neilo, A. Adams. Testa transversa eequivalvis, incequilateralisy epidermide fusco tenui indiita, latere postico Mans. Dentibus cardinalibus^ nullis, lateribus anticis et posticis plurimis in serie rectiusctda
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