192 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
Genus TURCICA A. Adams, 1854 
Shell conoidal, thin, subdiaphanous, imperforate; whorls with trans¬ 
verse series of granules, the last rounded on the periphery; columella 
thick, spirally twisted posteriorly, ending anteriorly in an obtuse, promi¬ 
nent point; outer lip thin, simple, acute. (H. and A. Adams.) (Tryon 
and Pilsbry, Manual of Conchology.) 
Type. T. monilifcra A. Adams. 
Distribution. Australia, Japan, China, California, Philippines, Lord 
Hoods Island, Sea of Korea. 
Turcica caffea Gabb, 1865 
Proceedings of the California Academy of Sciences, 3:187. Paleontology of Califor¬ 
nia, 2:16; PI. 3, fig. 27. 
T. conoidea, tenui; spira elevata; anfr. 1 nucleari, laevi, anfr. V ad 
marginem subangulatis, supra recte declivis, ultimo infra sub-planato; 
sutura valde impressa; tota superficie concentrice tuberculato costata; 
costis circitur XVIII ad ult. anfr.; epidermide flavida; apertura oblique 
sub-quadrata, intus albida. (Gabb.) 
Shell conical, thin; spire elevated; one nuclear whorl, smooth, five 
perfect whorls subangulated at the margin, obliquely flat above; body 
whorl very slightly convex at the base; suture strongly impressed; surface 
marked by revolving tubercular ribs, about eighteen on the body whorl, 
one broad one on the margin, and about eight or nine on the under side; 
these ribs are less numerous on the preceding volutions, only four can be 
counted on the upper side of the penultimate whorl ; the tubercles are 
arranged so as to present an irregular quincunix; epidermis a rich coffee 
brown, darker between the tubercles than on their summits; aperture 
obliquely quadrangular, outer lip and base acute, internally pearly white, 
columella bearing two strong folds, the lower one of which borders the 
truncated end and terminates in a faint tubercular enlargement; behind 
the columella is a slight groove running from the base to the end of the 
upper columellar fold. Long., 55; lat., 58; long, aper., 26; lat. aper., 28 
poll. (Gabb.) 
Type in Mollusca, Survey Collection, No. 355. Type locality, Cali¬ 
fornia. 
Range. San Pedro, California, to Cape San Lucas, Lower California. 
Genus CIDARINA Dali, 1902 
Shell large, whitish, unicolor, with strong spiral sculpture sharply 
nodose, the umbilicus closed by a reflected layer of callus, the suture 
channeled. (Dali.) 
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