The Cambridge natural history . Fig. 303.—Pecten 2jaUium L., Fig. 304. — Sjpondyluspetroselinum Sowb.,Mauritius ; on a coral. FA:sr. 7. Dimyidae.—Shell ostreiform, fixed, hinge with orwithout symmetrical teeth, two muscular impressions. Singlegenus, Dimya (Tertiary). EULAMELLIBRANCHIATA SUBMYTILACEA 451 Order IV. Eulamellibranchiata Mantle edges united at one or more points, branchiae withinterfilamentary junctions wliich are always vascular, genitalglands not opening into the kidneys, usually two adductormuscles. Sub-order I. Submytilacea.—Mantle edges more or less open,anal orit
The Cambridge natural history . Fig. 303.—Pecten 2jaUium L., Fig. 304. — Sjpondyluspetroselinum Sowb.,Mauritius ; on a coral. FA:sr. 7. Dimyidae.—Shell ostreiform, fixed, hinge with orwithout symmetrical teeth, two muscular impressions. Singlegenus, Dimya (Tertiary). EULAMELLIBRANCHIATA SUBMYTILACEA 451 Order IV. Eulamellibranchiata Mantle edges united at one or more points, branchiae withinterfilamentary junctions wliich are always vascular, genitalglands not opening into the kidneys, usually two adductormuscles. Sub-order I. Submytilacea.—Mantle edges more or less open,anal oritice distinct, usually no siplions, pallial line usually simple,cardinal and lateral teeth well marked. Fam. 1. Cktrditidae.—Foot with a byssus or groove, branchiaelarge, unequal; shell equivalve, solid, radiately grooved, one or two oblique cardinal teeth, one or two laterals. Silurian . Principal genera: Venericardia, CardAta, Carditella, Carditopsis,Milneria ; Pleurophorus (Palaeozoic), Anodontopsis (Silurian). Fam. 2. Astartidae.—A short anal siphon, labia
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
