278 America}! Se ash ells 



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. 



