Euvola brouweri (Tucker-Rowland, 1934)
TUCKER-ROWLAND, H. I. 1934. Some Atlantic Coast Tertiary Pectinidae. The American Midland Naturalist, 15: 612-621, pls. 25-27 [Under H. I. Tucker] [p. 612, pl. 25, figs. 4-5]
1934 Pecten (Pecten) brouweri Tucker-Rowland, 1934
H. I. Tucker-Rowland, 1934,
plate 25. |
«Description: Shell equilateral, very inequivalved, the right valve strongly convex, well developed radial sculpture. On the right valve 14 broad, flat-topped primary and two secondary ribs at each submargin. Each primary rib has a cord on the summit, extending from the umbonal region to the margin of the disk. Fine, concentric, crowded imbrications on disk tend to become coarser and more conspicuous in the umhonal region. Interspaces flat, about half as wide as the primary ribs. Margins scalloped. Submargins narrow, steep, without ornamentation. Auricles nearly equal; 5 to 6 radials, which become obsolete near the beak. Left valve very slightly concave; 13 high, rounded ribs which develop a median sulcus about 14 mm. from the ventral margin of the disk. A single intercostal between two of the ribs on the anterior portion of the disk. Near the beak the ribs tend to become nearly obsolete. Fine, closely spaced, concentric sculpture over the disk and auricles. No radials on the submargins. Ribs about half as wide as the flat interspaces. One radial on each of the subequal auricles. Dimensions. — right valve, height 43, width 46 mm.; left valve, height 41.5, width 45 rnm.; diameter 21 mm. This species is named in honor of Professor H. A. Brouwer, of Der Universiteit van Amsterdam.
Remarks. — P. brouweri differs from P. raveneli Dall in width of interspaces, convexity, and number of ribs. The interspaces of raveneli are scarcely more than sulci; commonly has 22 ribs; much stronger, uniform, and coarser concentric sculpture than brouweri; the left valve of raveneli is more concave than that of this species. Occurrence. — Waccamaw Pliocene. Walkers Bluff, N . C. (type); Nixon's Landing, N. C., Dr. Burnett Smith. Cotypes. — Right and left valves of the same individual. Collection H. I. T ucker. Paratypes. — Deposited in the collection of the Paleontological Research Institution, Ithaca, New York, by Dr. Burnett Smith.» HELEN lONE TUCKER-ROWLAND, 1934
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