166 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
Cystiscus minor C. B. Adams, 1852 
Panama Shells, 40. Tryon, Manual of Conchology, 5; PI. 12, fig. 65. 
Shell ovate, white, or pale horn color, subtransparent; rather thin, 
smooth; spire slightly elevated; whorls about three (?) with a very in¬ 
distinct suture; aperture linear; lip rather thin at the margin, thickened 
behind, posteriorly ascending the spire; columella with two w^ell-developed 
plaits at the end, with a third one less developed, and sometimes with a 
fourth which is more or less indistinct. Length, .09; breadth, .063 in. 
(C. B. Adams.) 
Type in Amherst College Collection. Type locality, Panama. 
Range. San Pedro, California, to Panama. 
Genus CYPRAEOLINA Cerulli-Irelli, 1911 (Marginella) 
Shell minute, bulliform, spire sunken; aperture long, the outer lip 
sometimes denticulated within and extending above the spire; with four 
plaits anteriorly, and with smaller ones behind them, becoming obsolete. 
(Oldroyd.) 
Distribution. Alaska to Mazatlan, Mexico. 
Cypraeolina pyriformis Carpenter, 1865 
Journal dc Conchyliologie, 13: 148. Tryon, Manual of Conchology, 5; PI. 13, fig. 38. 
V. t. parva “V. margaritulae” simili sed aurantiaco pallide tincta; antice 
angustiore, magio elongata; labio conspicus; labio postice parum sinuato, 
intus denticulis minus expressis ornato; plicis columellaribus normalibus, 
acutioribus. Long., .01; lat., .065 poll. (Carpenter.) 
Shell small, pyriform, sometimes tinged with orange; aperture long 
and narrow, with the outer lip extending above the spire. Columella plates 
rather acute, four in number. 
Type in United States National Museum. Type locality, San Diego, 
California. 
Range. Peril Strait, Alaska, to Mazatlan, Mexico. 
Described as Volutella pyriformis. 
Family VOLUTIDAE 
Genus FULGORARIA Schumacher, 1817 
Shell oblong-fusiform; spire moderately elongated, terminated by a 
papillary summit with the apex lateral, instead of central and vertical as 
