Chlamys (Plagioctenium) gardnerae Cooke, 1919
COOKE, C. W. 1919. Tertiary mollusks from the Leeward Islands and Cuba. In: T. W. Vaughan (ed.), Contributions to the Geology and Paleontology of the West Indies, pp. 103-156. Carnegie Institution of Washington, Washington, DC. [p. 134, pl. 7, figs. 5-6]
«Pecten gardnerae, new species.
(Plate 7, Figures 5, 6.) The following is a description of this species:
Right valve inflated, with 15 round ribs a little wider than the interspaces; submargins slightly convex, steep; anterior ear with about 6 radiating riblets, byssal notch one-half the length of the ear; posterior ear large, nearly rectangular; sculpture of close, minute growth-lines over entire shell.
Alt. of right valve, 21 mm.; lat., 21.5 mm. Left valve flatter, with about 16 even, rounded ribs a little narrower than the interspaces; submargins convex, steep; anterior ear acutely oblique, with two or three very faint, broad, radiating riblets; posterior ear rectangular; concentric sculpture of minute, elevated, very close-set lines extending over entire shell, but on the disk grouped into bands or growth stages about 0.3 mm. wide. Alt. of left valve, 22.6 mm.; lat., 22.3 mm. The right valve is much more convex and appears less spreading than the left, and the concentric sculpture is much less distinct. This last feature is probably due to the better state of preservation of the left valve. I have described the valves separately on account of the possibility that they may belong to different species.
Pecten gardnerae has closer, higher, and more strongly convex ribs than P. vaughani and the ribs, in the specimens at hand, extend to the beaks. The secondary sculpture is very different. This species closely resembles the figure of P. cercadica Maury from Cercado de Mao, Santo Domingo, but seems to be a little less spreading and to have differently shaped ears. In the description of P. cercadica, a left valve, no mention is made of any grouping of the growth-lines on the disk. This species is named in honor of Miss Julia Gardner, whose monographs (unfortunately delayed in publication) on the Miocene Mollusca of Virginia and North Carolina and of the Alum Bluff formation constitute an important contribution to American paleontology. Locality.— Santiago, Cuba, station 3440, Vaughan. Geologic horizon.— Oligocene. Type.—U. S. Nat. Mus. No. 167113 (right valve). Figured specimen.— U. S. Nat. Mus. No. 167114 (left valve).» CHARLES WYTHE COOKE, 1919
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C. W. Cooke, 1919, plate 7.
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