Cyclopecten subimbrifer Verrill & Bush in Verrill, 1897
VERRILL, A. E. 1897. A study of the family Pectinidae, with a revision of the genera and subgenera. Transactions of the Connecticut Academy of Arts and Sciences, 10: 41-95, pls. 16-21. [p. 84]
«Cyclopecten subimbrifer Verrill and Bush, sp. nov.
Pecten Hoshynsi Verrill, Trans. Conn. Acad., vol. v, p. 581, pl. xliv, fig. 11, 1882 (non Forbes).
Shell small, inequivalve, white or grayish white, translucent, length and height nearly equal. Dorsal margin straight; anterior auricle in the left valve rather large and broad, the outer end obtusely rounded and covered with small, close radial ribs and crowded concentric ridges; posterior auricle much smaller, with one to three faint radial ridges and many concentric raised lines; outer end forming less than a right angle, with a slight, incurved notch below. In the right valve the anterior auricle has a similar radial sculpture and the byssal notch is rather deep and narrow.
The dorsal outlines of the body of the shell form rather less than a right angle; the ventral margin forms nearly a semicircle, and forms obtuse angles where it meets the dorsal outlines. Umbos a little prominent, with beaks small, acute, smooth, and projecting beyond the margin of the hinge. The surface of the left valve is covered with slightly raised concentric lines, which are raised into small arched scales; these are often semicircular, but more frequently somewhat angulated or V-shaped; they are usually separated by intervals about equal to their breadth. These scales are arranged in about 40 or more radial rows and decrease regularly in size to the umbo, where they are replaced by thin and slightly raised radial lines, crossing the stronger and more elevated concentric lines, but not rising into points. The posterior dorsal area, below the auricle, is nearly smooth, except for the fine lines of growth, but sometimes shows minute granules. The right valve, which is smaller than the left, is covered by fine, thin, close, concentric raised lines, which sometimes show microscopic striations. The anterior auricle is decussated by six to eight or more, small radial ridges, which are crossed by the raised concentric lines; the latter rise into sharp scales at the dorsal margin; the small posterior auricle has fine concentric lines and only two or three faint radial ridges. Off the eastern coast of the United States; 121 to 312 fath. The figures of this and various other species were forwarded, several months ago, to the U. S. National Museum, to illustrate an article in its Proceedings. ADDISON EMERY VERRILL, 1897
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Pecten Hoskynsi; A. E. Verrill, 1882, Catalogue of marine Mollusca added to the fauna of New England during the past ten years, plate 44, figure 11.
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