The Cambridge natural history . rous ; shell solid, equi^ilve, hinge usually with three cardinal teeth, laterals variable. Jurassic . Principal genera: Cytherea, Circe ; Grateloujoia (Ter-tiary), Meroc, Dosinia ( = Artemis),Cyirriiacria, Cyclina, Venus, Clem-entia, ZucinojJsis; Thetis (Creta-ceous), Ta2?es, Venerupis. Fam. 2. —-Animal Fig. 307.—Ci/thei-ca dioneLi\,m.,Ptxw. c i in ^ ?^ perforating rocks ; shell oval, slightly gaping l:)ehind, two or three cardinals, no laterals, pallial sinus well marked. Eecent . Genera : Petricola, jSfaranio. Fa^nl 3. Glaucomyidae.—Siphons l
The Cambridge natural history . rous ; shell solid, equi^ilve, hinge usually with three cardinal teeth, laterals variable. Jurassic . Principal genera: Cytherea, Circe ; Grateloujoia (Ter-tiary), Meroc, Dosinia ( = Artemis),Cyirriiacria, Cyclina, Venus, Clem-entia, ZucinojJsis; Thetis (Creta-ceous), Ta2?es, Venerupis. Fam. 2. —-Animal Fig. 307.—Ci/thei-ca dioneLi\,m.,Ptxw. c i in ^ ?^ perforating rocks ; shell oval, slightly gaping l:)ehind, two or three cardinals, no laterals, pallial sinus well marked. Eecent . Genera : Petricola, jSfaranio. Fa^nl 3. Glaucomyidae.—Siphons long, united, foot small;shell produced, thin, hinge with three cardinals, no laterals,pallial sinus well marked. Eecent. Genus, Glaucomya (inchTanysi])lioii). Sub-order IV. Cardiacea.—Branchiae much folded back,mantle edges with three apertures, foot cylindroidal, more or lessproduced, siphons present or absent, one or two adductor muscles,pallial line varial)le. Fam. 1. Cardiidae.—Siphons rather long, foot long, no. EULAMELLIBRANCHIATA—CARDIACEA 455
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
