Bulletins of American paleontology . TELLTXA LUSOKIA. (Fig. 225a.) Siiell ol)loiig, narrowed posteriorly, slightly gaping or re-flected ; pallial sinns deep:^^??-?- concentrically striate; pos- terior margin niaiked withone or two folds; surfacestill hrown ; concentric striaeare in the form of raisedsharp lines, not impressedlines of growth. The Tipho-nal inflection is in contact ^vith the pallial line, in Mhich re-spect it agrees with P. Sammobia, but its hinge teeth are2—2 in both GENUS DONAX. The general form is trigonal, or wedge form, valves closed,front produced, posterior short
Bulletins of American paleontology . TELLTXA LUSOKIA. (Fig. 225a.) Siiell ol)loiig, narrowed posteriorly, slightly gaping or re-flected ; pallial sinns deep:^^??-?- concentrically striate; pos- terior margin niaiked withone or two folds; surfacestill hrown ; concentric striaeare in the form of raisedsharp lines, not impressedlines of growth. The Tipho-nal inflection is in contact ^vith the pallial line, in Mhich re-spect it agrees with P. Sammobia, but its hinge teeth are2—2 in both GENUS DONAX. The general form is trigonal, or wedge form, valves closed,front produced, posterior short; margins usually erenulated ;hinge teeth 2—2; laterals 1—1 iu each valve; pallial sinusdeep. North Carolina Geol. Sur.: Emmons 207 29s noktn-cakolina geological sukyey. DoxAx.—(Fig. 226.)Fig. 22G. Shell triangular, rather abruptly truncate be- hind, and traversed by a ridge from the umbo tothe base; surface marked by obscure radiatinglines; base crenulated. This small shell ditfei-sfrom the variahilix in its proportion: it is more triangular, andis not produced so much in front. Donax Variabilis probably occurs in the marl of Xorth-Carolina, but has hitherto been overlooked. FA:\[ILT MxVCTEroAE. GENUS ISIACTEA. The shell is equivalve, and nearly equilateral; the ante-rior hinge tooth is iu the form of an inverted A; lateral teethdoubled in the right valve. MACTRA CONG EST A. Shell rather small, but thick at the umbo; triangular, rath-er inflated ; inequilateral; rounded anteri
Size: 2142px × 1166px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookidbulletinsofa, bookyear1895
