Page:American Seashells (1954).djvu/207

Rh %6 to % inch in length, fragile, light-brown; moderately elongate, with 7 whorls, the last being quite large. Nuclear whorls extremely small. Sur- face glossy, smooth, except for numerous, microscopic, incised spiral lines. Characterized by the strong ridge just inside the aperture on the columella. Often washed ashore with floating sargassum weed, and frequently dredged in a dead condition at any depth. This is L. bombix Kiener and L. bomhyx "Rang." Subjmnily CERITHIOPSINAE Genus Cerithiopsis Forbes and Hanley 1849 Cerithiopsis greeni C. B. Adams Green's Miniature Cerith Plate 1 9V Cape Cod to both sides of Florida. Ys inch in length, elongate, slightly fusiform in shape, glossy-brown in color. 9 whorls, the first 3 embryonic, translucent-brown and smooth, the remainder with 2 to 3 spiral rows of large, glassy beads connected by weak spiral and axial threads. Columella arched in young specimens, but straight and continuous with the short siphonal canal in adults. Lip in adults smoothish, slightly flaring. C. virginica Henderson and Bartsch and C. van- hyningi Bartsch are possibly variations of this species. Common in shallow water. Subgenus Laskeya Iredale 191 8 Cerithiopsis subulata Montagu Awl Miniature Cerith Plate 19W Massachusetts to the West Indies. /4 to % inch in length, rather strong, slender and with about 14 whorls. Sides of whorls flattish, with 3 rows of distinct, raised, roundish beads (about 28 per row on the last whorl). There may be faint axial riblets connecting the beads. The middle row of beads may be reduced to a mere thread in specimens from southern localities. Base concave and with fine axial growth lines. Color chocolate-brown, with the beads a lighter shade. Some shells become eroded and colored an ash-gray or chalky-brown. C. emersoni C. B. Adams is probably a synonym. Common from i to 33 fathoms. Cerithiopsis carpenteri Bartsch Carpenter's Miniature Cerith Crescent City, California, to Ensenada, Mexico. % to /4 inch in length, dark chocolate-brown with whitish beads. Whorls in spire with 3 spiral rows of evenly sized, glassy, rounded beads.