Page:American Seashells (1954).djvu/360

278 Bulla gouldiana Pilsbry Santa Barbara to the Gulf of California. California Bubble 1% to 2 inches in length, rotund, fragile. Grayish brown with darker, streaked mottlings which are bordered posteriorly with cream. Periostracum dark-brown and microscopically crinkled. Collected abundantly at night. Bulla pimctiilata A. Adams from Lower California south is much heavier and constricted or narrowed at the top third of the shell. FaiJtily ATYIDAE Genus Atys Montfort i8io Atys caribaea Orbigny Southeast Florida and the West Indies. Caribbean Paper-bubble Figure 59c Vs to Yo inch in length, fragile, translucent milk-white, oval-oblong, smooth except for a dozen or so very fine, incised spiral lines at both ends.

Figure 59. Paper-bubbles of the Atlantic Coast, a, Retiisa obnisa Montagu; b, Diaphana vmiuta Brown; c, Atys caribaea Orbigny; d, Atys sandersoni Dall; e, Philwe qnadrata S. Wood; f, Philiiie lima Brown. All X5.

Spire concealed, marked by a twisted, spiral, funnel-like umbilicus. Colu- mella acute, a little separated by a deep, narrow umbilicus. Common from shallow water to 90 fathoms. Atys sajidersoni Dall Sanderson's Paper-bubble Figure 59d North Carolina to southeast Florida and the West Indies. 34 to Vs inch in length, similar to caribaea, but thicker-shelled, with flatter sides, deeper and wider umbilicus, and with more numerous and finer spiral lines at each end. Fairly common from shallow water to over 100 fathoms.