152 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
Distribution. West Indies, Mediterranean, W. Africa, India, China, 
California. Fossil: Upper Chalk. 
Subgenus Progabbia Dali, 1918 
Cancellaria cooperi Gabb, 1865 
Plate 11, fig. 14 
Proceedings of the California Academy of Sciences, 3:186. Tryon, Manual of 
Conchology, 7; PI. 4, fig. 65, 1885. Bulletin 112, United States National Museum; 
PI. 5, figs. 3, 4. 
Broadly subfusiform, nuclear whorls two, smooth, round; normal 
whorls seven, subangulated, concavely excavated above the angle; angle 
acutely tuberculated; below the angle the surface is ornamented by about 
twelve slightly oblique ribs each rib ending in a tubercle at the upper 
angle; the whole surface ornamented, besides these ribs, by small, closely- 
placed, revolving ribs; color yellowish-brown crossed by about a dozen 
brown revolving bands; these bands usually cover the larger of the con¬ 
centric ribs; canal elongate, columella but slightly twisted; umbilicus 
obsolete; inner lip but slightly encrusted, bearing two sharp oblique folds; 
outer lip acute simple. (Gabb.) 
Height of shell, 80; of last whorl, 50; of aperture, 41; width of last 
whorl, 36 mm. (Oldroyd.) 
Type in Geological Survey, Mollusca Survey Cabinet, No. 463. Type 
locality, San Diego, California. 
Range. Monterey, California, to Coronado Islands. 
Cancellaria io Dali, 1896 
Proceedings of the United States National Museum, 18 :14. Bulletin, Museum of Com¬ 
parative Zoology, 43, No. 6; PI. 1, fig. 2. 
Shell fusiform, solid, whitish or pink, with a more or less olivaceous 
epidermis, and about six whorls; spire pointed, whorls rounded, some¬ 
what constricted in front of the suture, which is appressed; sculpture 
of numerous flattened spiral threads, with about equal interspaces, uni¬ 
form over the whole surface, but with occasional finer intercalary threads; 
these are crossed by (on the last whorl about 13) rather stout, rounded 
ribs, strongest at the shoulder, obsolete beyond the periphery, and not 
reaching the suture behind them; aperture rather long, outer lip simple, 
smooth, not reflected or lirate; pillar rather straight, with three strong 
plaits; canal shallow, wide, pointed, making no perceptible fasciole; um¬ 
bilicus none; body whorl with a thin wash of callus. Height of shell, 
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