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620 EDGAR A. SMITH.the shell being smooth. The insertion plates are thick and striated across the edge. The anteriorvalve exhibits eight slits, the posterior ten and the median valves none.Family ACANTHOCHITIDAE.283. Acanthochites (Loboplax) laqueatus, Sowerby, 34, A'/ F. {Angada teirica, 34, Z/T.)V, XII, XIV.Testa parva, elongata, subdepressa, purpureo-rosea, albo variegata, valvis antica et posticapallidis, cingulo puniceo vel viridi, hie illic albo maculato, circumdata ; valvae rugose squamataeantica costis radiantibus quinque vix elatis instructa, undique squamata, medianae angustae, inmedio postice rostratae, area dorsali sublaevi, postica undique squamata, breviter mucronata.Longit. 16 mm., diam. 12 mm.This species is remarkable for its brilliant variable colour, the narrowness of the central valvesand theircoarse squamulation.The anterior valve in the Maldive specimens is greenish grey with five paler rays and theposterior margins are also whitish with one or two black spots. Central valves purplish rose withsome whitish streaks or wrinkles on each side the dorsal area. Mantle purple red with a whitespot on eacli side the first, seventh and eighth valves surrounding the lateral pores there situated,also some black spots set in white rings all round the edge, about 17 or 18 altogether, and witha fringe at the extreme margin of short white spicules.Another specimen has the valves similarly coloured, only the seventh is decidedly greenexcepting the rosy-purplish dorsal area. The mantle, however, is of a vivid green, witli a whitestripe on each side the anterior valve and four or five stripes or spots in front, the outer marginwith a similar fringe of spicules.Valves. First valve semicircular, the posterior margins being slightly divergent, exhibiting fivenot much raised rays which, like the rest of the surface, are covered with coarse elongate scaleswhich are finer towards the middle of the hinder edge. Insertion plate finely striated externally,acute at the edge, with five shallow slits.Central valves narrow, curved in front and rather acutely beaked behind ; dorsal area narrow,smooth, with cross marks of growth ; squamae arranged in rows, some parallel with the posteriormargin, others obliquely across the valves, three or four rows on each side the dorsal area beingwhite; insertion plates with a single posterior slit.Posterior valve semicircular, shortly mucronate, squamate everywhere, except upon the shortmucro which of course is like the dorsal area of the preceding valve ; insertion plate thickish,withnine slits.The colour of the interior of the valves of the only specimens disarticulated is a pinkish fieshtint, the head and tail valves being -paler than the rest.It does not seem to me advisable to place this species in the genus Angasia as distinct fromAcanthochites. I might also point out that the name Angasia was preoccupied in Crustacea. (SeeP. Z. S. 1863.)FamilyCRYPTOPLACIDAE.28i. Cryptoplax burrowi, Smith, 34, ZT. IX.