CLASS GASTROPODA 
81 
Type in United States National Museum, No. 226154. Type locality, 
Station 3670, Monterey Bay, California, in 578 fathoms. 
Range. Monterey to San Diego, California, in deep water. 
Cryptogemma eidola Dali, 1919 
Proceedings of the United States National Museum, 56:301. 
Shell small, white, covered with an olivaceous periostracum, and with 
four whorls exclusive of an apical whorl or two (which in the specimens 
is always eroded), suture distinct, the edge of the whorl in front of it 
slightly thickened; spiral sculpture on the upper whorls of a somewhat 
blunt peripheral keel, undulated more or less toward the apex and obsolete 
on the last whorl; other sculpture of minute, broken, irregular, more or 
less oblique, usually punctate impressed lines; aperture simple, the outer 
lip sharp, the body erased, white, the canal short, somewhat recurved. 
Height of four whorls, 15; of last whorl, 10; diameter, 7 mm. (Dali.) 
Type in United States National Museum, No. 212336a. Type locality, 
off San Diego, California, in 822 fathoms. 
Range. Monterey to San Diego, California, in deep water. 
Cryptogemma oregonensis Dali, 1919 
Proceedings of the United States National Museum, 56:301. 
Shell small, white, with a pale olivaceous periostracum, and more than 
four whorls, the apex always eroded, the suture distinct, the whorl in 
front of the suture as far as the shoulder flattish; shoulder of the whorl 
strongly marked, angular, coronated by the ends of (on the penultimate 
whorl about 25) straight, protractively oblique narrow ribs with unequal 
interspaces, becoming obsolete on the base of the last whorl; incremental 
lines more or less distinct but not regular; spiral sculpture of one or two 
feeble impressed lines on the whorl above the shoulder, and three or four 
widely spaced threads on the base; though the region of the canal is free 
from spiral sculpture; aperture narrow, anal sulcus wide and shallow, 
outer lip produced, thin, body and pillar erased, canal rather short, axis 
pervious. Height of four whorls, 11; of last whorl, 7; diameter, 5 mm. 
(Dali.) 
Type in United States National Museum, No. 214243. Type locality, 
Station off Tillamook, Oregon, in 786 fathoms. 
Range. Off Tillamook, Oregon. 
Genus ANTIPLANES Dali, 1902 
Shell smooth except for incremental lines and sometimes fine spiral 
striae, the periostracum is conspicuous and the shell disposed to be chalky, 
[81] 
