Transactions - American Philosophical Society . showing through it. The character ofthe cardinal tooth is very peculiar, having a tendency to besingle in both valves, while the lamellar tooth is quite equallydisposed to be double. All the specimens which I have seenare salmon colour in the nacre. If this should prove univer-sally so, it is the only species which we know to be con-stantly of that colour. 3. Unio Heterodon. Plate VIII. fig. 11. Testa rhomboido-ovata, inaquilaterali, ventiicosii; valvulis tenuibus;dentibus cardinalibus compressis, latis; dentibus lateralihus sub-curva-tis, dente
Transactions - American Philosophical Society . showing through it. The character ofthe cardinal tooth is very peculiar, having a tendency to besingle in both valves, while the lamellar tooth is quite equallydisposed to be double. All the specimens which I have seenare salmon colour in the nacre. If this should prove univer-sally so, it is the only species which we know to be con-stantly of that colour. 3. Unio Heterodon. Plate VIII. fig. 11. Testa rhomboido-ovata, inaquilaterali, ventiicosii; valvulis tenuibus;dentibus cardinalibus compressis, latis; dentibus lateralihus sub-curva-tis, dente laterali valuulce. dextrcB, dupUci; 7iatibus p7-ominentibus; liga-mento sub-brevi; margariid alba. Shell rhomboidal-ovate, inequilateral, ventricose; valves thin; cardi-nal teeth compressed, wide; lateral teeth slightly curved, the doubletooth in the right valve; beaks prominent; ligament rather short; nacrewhite. Hab. Schuylkill and Derby Creek, Pa. My Cabinet. Cabinet of Mr Mason. Cabinet of Prof. Vanuxem. Cabinet of Dr Griffith. FL Am Vjiio Tubiginosus Unio heUrodon ? P, Initio suicauis. Drawn fC£no^ by 4 OF THE FAMILY OF NAIADES. 429 Cabinet of the Academy of Natural of Mr of Mr of Mr -5, Length -9, Breadth 1-5 inches. Shell rhomboidal-ovate, inequilateral, ventricose; substanceof the shell thin; beaks prominent, subcarinate posteriorly,eroded, undulated; ligament rather short; epidermis green-ish brown, with oblique obscure rays, w^rinkled; dorsal mar-gin rectilinear; posterior dorsal margin obtusely angular;posterior margin acutely angular; basal margin slightly curv-ed; anterior, anterior basal and dorsal margins rounded;cardinal tooth in left valve compressed, wide, reaching be-yond the cavity of the beaks, double cleft; in right valve oneelevated recurved tooth, which clasps the side of the opposingone; lateral tooth curved, short in left valve, and long in theright, in which it is double; anterio
Size: 1532px × 1630px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury, bookidtransactionsame03ameruoft, booksubjectscience
