CLASS GASTROPODA 
133 
Type in Oldroyd Collection, Stanford University. Type locality, off 
Catalina Island, California. 
Range. Oregon to San Diego, California. 
Genus ELACHISINA Dali, 1918 
Shell minute, elevated, with naticoid spiral sculpture, umbilicate. (Dali.) 
Type. Elachisina grip pi Dali. 
Distribution. California, deep water. 
Elachisina grippi Dali, 1918 
Proceedings of the Biological Society of Washington, 31:137. Proceedings of the 
United States National Museum, 56:354; 1919. 
Shell minute, having somewhat the aspect of a short Cingula, white, 
with a very thin periostracum, and four well-rounded whorls, exclusive of 
a small glassy subglobular slightly depressed nucleus; the suture con¬ 
stricted but hardly appressed; spiral sculpture of fine uniform striae with 
slightly wider interspaces, covering the whole shell; aperture subovate, 
the outer lip thin, the body with a continuous coat of enamel, the pillar 
arcuate; the umbilicus naticoid, narrow twisted, with an internal spiral 
ridge. Height of shell, 3; of last whorl, 2; diameter, 2 mm. (Dali.) 
Type in United States National Museum, No. 250230. Type locality, 
off San Diego, California. 
Range. Known only from type locality. 
Genus BULBUS Brown, 1839 
Shell globular, spire very short; columellar margin incurved, columella 
twisted; lip fragile. (Tryon, Manual of Conchology.) This is the descrip¬ 
tion of Acrybia H. and A. Adams, 1853. 
Type. Natica flava Gould. 
Distribution. Maine, Newfoundland, Finmark, Nova Zembla, Arc¬ 
tic Ocean to Aleutian Islands, and Shumagin Islands. 
Bulbus fragilis (Leach, 1819) apertus (Loven) Middendorl'f, 1851 
Journal de physique , 88:464. Middendorff, Sibirische Reise, PI. 11» fi& s * 1 _ 3. 
Testa rimata, valde tenui, pellucida, ovato-globosa; anfr. 4, ultimo, 
inflato, suturae appresso; spira brevi obtusa; apertura ampla, longitudinali 
ovata, postice emarginata anfractu penultimo; lamina columellari tenuis- 
sima supra umbilicum omnino tectum incrassata, effusa, revoluta deinde 
sensim angustata, producta, et in labrum continuata, acutum, tenuissimum, 
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