CLASS GASTROPODA 
153 
43; of last whorl, 33; of aperture, 25; width of last whorl, 21 mm. 
(Dali.) 
Type in United States National Museum. Type locality, U.S. Fish 
Commission Station 3354, in 322 fathoms, Gulf of Panama. 
Range. San Diego, California, in 650 fathoms, to Gulf of Panama, 
in 322 fathoms. 
Cancellaria corbicula Dali, 1906 
Bulletin, Museum of Comparative Zoology, 43, No. 6:294; Pi. 1, fig. 4. 
Shell small, thin, milk-white, with a thin pale-yellow periostracum, 
and about six whorls besides the blunt (decollate) nucleus; form buli- 
moid, aperture nearly equal to the spire in length; whorls evenly rounded, 
with a strongly marked suture; sculpture between the sutures of seven 
to nine flattish revolving threads with slightly wider channeled interspaces; 
these are crossed by numerous, subequally spaced, very narrow, low, 
slightly arcuate axial ridges, slightly nodulous at the intersections; there 
are also very numerous, prominent, incremental lines in the interspaces; 
aperture oval, outer lip smooth, entire, reflected; inner lip with a thin 
callus coat of enamel, continuous with the outer margins; pillar short, 
axis imperforate, with two strong oblique plaits near the proximal end 
of the pillar; canal obsolete. Length of shell, 21.5-26; of last whorl, 
16; of aperture, 10.5; max. diam., 9.5 mm. (Dali.) 
Type in United States National Museum. Type locality, U.S.S. “Alba¬ 
tross” Station 2936, off San Diego. 
Range. Santa Barbara Islands to Coronado, Islands. 
SECTION CRAWFORDIANA Dali, 1919 
Cancellaria crawfordiana Dali, 1891 
Proceedings of the United States National Museum, 14:182; PI. 6, fig. 1. 
Shell elongated, slender, with six moderately rounded whorls, reticu- 
lately sculptured and covered when fresh with a rather coarse brown 
fibrous epidermis; whorl transversely sculptured with from fourteen to 
twenty narrow, clear-cut, moderately elevated, even, slightly flexuous ribs, 
crossing the whorls, but less prominent anteriorly and separated by wider 
interspaces. The only other transverse sculpture is of lines of growth; 
spiral sculpture of (between the sutures nine to ten) narrow, flat-topped, 
strap-like elevated cinguli, with wider excavated interspaces, rather uni¬ 
formly spread over the whorl, but more distant near the shoulder, and 
on the earlier whorls somewhat sharper and relatively more prominent. 
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