154 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
Between the cinguli, and rarely on them, are a few obscure, revolving 
lines. On the canal the cinguli become rounded, smaller and obscure. 
The surface under the dehiscent epidermis is polishd pale brown, with a 
somewhat chalky substratum easily eroded. The upper whorl or two have 
lost most of this layer in the specimen figured and the nucleus is lost. 
The suture is deep, but not channeled. The canal has no constriction 
behind it. The aperture is rather long, the outer lip but slightly reflected 
and a little fluted by the spiral sculpture. Inside there are a few faint 
and obscure lirae. The throat is pure white; the thin body callus, tinged 
with pale-pinkish brown. The anterior angle of the aperture is nearly 
canaliculate, and produces a perceptible siphonal fasciole. The pillar is 
straight and strong, with two plaits; the posterior stronger, both oblique 
and rather low. The angle of the edge of the pillar, though not elevated, 
might by some be taken as an obscure third plait. At the end of the 
plaits on the callus of the pillar are a number of small shelly pustules 
like on C. cassidifonnis. Long, of shell, 43; max. alt., 21 mm. (Dali.) 
Type in United States National Museum. Type locality, Drake's Bay, 
near San Francisco, California. 
Range. Bodega Bay to San Diego, California. 
Subgenus Sveltia Jousseaume, 1888 
Cancellaria modesta Carpenter, 1865 
Annals and Magazine of Natural History t series 3, 15: 32. 
Testa elata, subrufa, trichotropiformi, marginibus spirae rectis; anfr. 
norm, v., rotundatis, postice subtabulatis, suturis impressis; costis spirali- 
bus obtusis, distantibus, inspira circ. iv., circa basim prolongatam circ. vii., 
aliis minoribus interdum intercalantibus; interstitiis secundum incrementa, 
decussatis; apertura subquadrata; columella plicis duabus declivibus anticis 
et costulis basalibus ornata; labio nullo. Long., .68; long, spir., .34; lat., 
.34 in. (Carpenter.) 
Shell elevated, reddish, margins of the spire straight; whorls normal 
or rotund, subtabulate in the rear, with impressed sutures, with obtuse 
spiral ribs, distant, about four to a whorl, on the body-whorl about seven, 
frequently with smaller ones intercalated; with channels, crossed by 
growth lines; aperture subquadrate, with two inclined plications in front, 
and a minute basal rib. 
Type in United States National Museum. Type locality, Neah Bay, 
Washington. 
Range. Aleutian Islands, Alaska, to Neah Bay, Puget Sound. 
[154] 
