The Annals and magazine of natural history; zoology, botany, and geology . ssumption; for who, on such subjects and in the exami-nation of these minute objects, can hope to escape from occa-sional error ? I invite malacologists to offer their corrections, ifI have diflPered on insufficient grounds from so eminent a natu-ralist as M. Deshayes; and I conclude with the evocation, Si quid novisti rectius istis, Candidas impsrti. I am, Gentlemen, your most obedient servant, William Clark. I beg that the notice relative to the Venus orbiculata ofMontagu, in my paper on the genus Cacum, in the A
The Annals and magazine of natural history; zoology, botany, and geology . ssumption; for who, on such subjects and in the exami-nation of these minute objects, can hope to escape from occa-sional error ? I invite malacologists to offer their corrections, ifI have diflPered on insufficient grounds from so eminent a natu-ralist as M. Deshayes; and I conclude with the evocation, Si quid novisti rectius istis, Candidas impsrti. I am, Gentlemen, your most obedient servant, William Clark. I beg that the notice relative to the Venus orbiculata ofMontagu, in my paper on the genus Cacum, in the Annalsfor August, may be considered as cancelled. XXXIV.—On the Classification of some British Fossil Crustacea,with Notices of neiv Forms in the University Collection at Cam-bridge. By Frederick MCoy, Professor of Geology andMineralogy in Queen^s College, Belfast. [Continued from p. 179.] Enoploclytia (MCoy), n. g. Etym. evoTrXc?, armatus, and Chjtia. Gen. Char. Carapace fusiform, back rounded, sides convex,gently compressed, posterior end slightly narrowed and deeply. Enoploclijtia. notched for the insertion of the abdomen, much contractedanteriorly, the front extended into a long, sharp-pointed de-pressed rostrum, the sides of which are armed with three orfour strong spines; one strong spine over the upper externalangle of the orbit; eyes on short, thick peduncles; nuchal some British Fossil Crustacea. 331 furrow strong, slightly arched backwards, the ends reachingeach side margin at a point deeply notched by the abrupt nar-rowing of the margin from thence to the front; branchial fur-rows double, inclosing between them a narrow, pointed ridge oneach side, which meets its opposite fellow at less than a rightangle (each meets the midline of the back at an angle of about40°) on a point of the back about halfway between the nuchal- furrow and the posterior margin ; abdomen (including the tail-fins) shorter than the carapace, segments very weak, slightlyarched, their ends trian
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