Middle of whorl with a strong, sharp, smooth or beaded, spiral thread. Base of shell smoothish except for one smooth spiral thread near the periphery and one heavily beaded cord bordering the deep, round umbilicus. Entire shell with numerous microsc0pic incised lines. Very commonly dredged from 35 to 150 fathoms, but also recorded from 683 fathoms.
Figure 31b
Alaska to San Diego, California.
1⁄2 to 3⁄4 inch in length, equally wide, solid, semi-gloss. Aperture circular. Umbilicus fairly wide, round, very deep. Whorls 7, shouldered just below the suture by a flat shelf. Lower 2⁄3 of whorl with numerous weak spiral cords that are smoothish in the last whorl but crossed by numerous axial riblets in the early whorls. Color tan with light-mauve stains and mottlings. Interior iridescent. Moderately common from 20 to 339 fathoms.
An image should appear at this position in the text. To use the entire page scan as a placeholder, edit this page and replace "{{missing image}}" with "{{raw image|American Seashells (1954).djvu/129}}". Otherwise, if you are able to provide the image then please do so. For guidance, see Wikisource:Image guidelines and Help:Adding images. |  |
Figure 32. a, Gaza watsoni Dall (nat. size); b and c, Solariella lacumella Dall ×4; d and e, Microgaza rotella Dall ×4. All from the Atlantic.
Genus Microgaza Dall 1881
Figure 32d, e
North Carolina to south Florida and the West Indies.
1⁄4 inch in diameter, spire flat, surface smooth except for a spiral row of low pimples just below the suture. Whorls about 5. Umbilicus fairly wide, very deep, its squarish edge bearing numerous, neat, rounded creases. Columella straight. Color whitish gray with a beautiful opalescent sheen, especially inside the aperture. Top of whorls colored with chestnut, zebra-like axial stripes. Very commonly brought up in dredging hauls off Miami from 50 to 100 fathoms. The form inornata Dall lacks the pimples just below the suture.
