C. t. elongata, gracili, albida vertice?; anfractibus XI(?) subplanatis; sutura impressa; costis radiantibus, circiter XXIII obtusis, sub-obliquis, ad basin evanidis; apertura sub-rotunda; columella incrassata.
Long. ·32?, lat. ·06, long aper. ·04.
Shell small, very slender, long, white; vertex broken; whorls eleven or more, flattened on the sides; suture strongly impressed; ribs about twenty-three, large, obtuse, running from the suture to the margin of the base; base convexly subtruncated, smooth; aperture subcircular; columella thick.
Hab. Monterey; a single specimen. Dr. Cooper.
This shell can be readily distinguished by its extremely slender form and the strong, slightly oblique ribs.
CANCELLARIA, Lam.
S. Gen. Narona, H and A. Ad.
C. (N.) Cooperii, G.
C. t. subfusiformi; anfractibus II lævibus; anfr. VII sub-angulatis; regione infrasuturali excavata, angulo coronato; regione infra-angulari oblique costata; costis circiter XII; tota superficie concentrice et confertim lirata; colore luteo lineis fuscis regulariter et concentrice lirato; canali elongato; columella vix tortuosa; plicis II; umbilico nullo; labio parum incrassato; labro acuto.
Long. 2·4, lat. 1·05, long. aper. 1·25.