CLASS GASTROPODA 
173 
Genus VOLUTOMITRA Gray, 1857 
Shell ovate or fusiform, smooth, covered with an epidermis, whorls 
simple; columella with oblique plaits; outer lip thin, simple, arcuate. 
(Adams, Vol. 1.) 
Type. Volutomitra groenlandica Gray. 
Range. Alaska to San Diego. 
Volutomitra alaskana Dali, 1902 
Nautilus, 15: 103. Bulletin 112, United States National Museum; PI. 11, fig. 3. 
Shell fusiform, with about six moderately convex whorls; suture dis¬ 
tinct, surface wholly minutely spirally striated, covered with an olivaceous 
periostracum over a white or yellowish shell; aperture longer than half 
the total length, with a rather wide canal, callus pillar and body in the 
adult, and simple outer lip; the canal has a well-marked siphonal fasciole, 
and is slightly flexuous; plaits normally four, rarely three or five, strong 
and rather distinct; nucleus almost always eroded. Long., 17.5; long, of 
aperture, 26 mm. (Dali.) 
Type in United States National Museum. Type locality, Pribilof 
Isands. 
Range. Pribilof Islands to San Diego, California, in 822 fathoms. 
Genus MITROMORPHA A. Adams, 1856 
Shell small, elongately fusiform; whorls flattened, with revolving lirae, 
and sometimes longitudinally plicate. Aperture narrow; columella straight, 
slightly transversely lirate; lip acute, smooth within, scarcely sinuated 
posteriorly. 
Type. Mitromorpha gracilis Carpenter. 
Distribution. California, Japan. 
Mitromorpha filosa Carpenter, 1865 
Anmls and Magazine of Natural History, series 3, 15:182. Proceedings of the United 
States National Museum, 15; PI. 19, fig. 1, 1892. 
Testa parva, solidiore, atro-purpurea, subconi formi, antice et postice 
subequilater teriti; anfr. nucl. ii., albis, laevibus, apice mamillato; norm, iv., 
plantis, suturis baud distinctis; omnino aequaliter spiraliter lirulata lirulis 
acutioribus, in spira iv., anfr. ult. circ. xx., interstitiis majoribus; apertura 
lineata; labro parum inflexo, rotundato, postice vix sinuato, intus circ. xii.- 
dentato; labio inconspicuo; columella arcuatim truncata. Long., .26; long, 
spin, .1; lat., .12 poll. (Carpenter.) 
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