186 PROCEEDINGS OF THE CALIFORNIA 



TURBONILLA, Risso. 



Chemnitzia, d'Orb. 



T. Gracillima, G. 



C. t. elongata, gracili, albida vertice?; anfractibus XI (?) subplanatis ; sutura 

 impressa; costis radiantibus, circiter XXIII obtusis, sub-obliquis,ad basin evani 

 dis ; 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 sub- 

 truncated, 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.) Cooperu, G. 



C. t. subfusiformi ; anfractibus II laevibus ; anfr. VII sub-angulatis ; regione in- 

 frasuturali excavata, angulo coronato; regione infra-angulari oblique costata ; 

 costis circiter XII ; tota superficie conceutrice et confertim lirata ; colore luteo 

 lineis fuscis regulariter et concentrice lirato; canali elongato; columella vix tor- 

 tuosa ; plicis II ; umbilico nullo ; labio parum incrassato ; labro acuto. 



Long. 24, lat. 1-05, long. aper. 125. 



Broadly subfusiform, nuclear whorls two, smooth, round ; normal whorls seven, 

 subangulated, concavely excavated above the angle; angle acutely tuberculated; 

 below the angle the surface is ornamented by about twelve slightly oblique ribs> 

 each rib ending in a tubercle at the upper angle ; the whole surface is ornament- 

 ed, besides these ribs, by small, closely placed, revolving ribs; color yellowish 

 brown crossed by about a dozen brown revolving bands ; these bands usually cover 

 the larger of the concentric ribs ; canal elongate , columella but slightly twisted ; 

 umbilicus obsolete ; inner lip but slightly encrusted, bearing two sharp oblique 

 folds ; outer lip acute, simple. 



Hab. One beach specimen, San Diego ; another inhabited by a crab, Monterey, 

 10 fms., and a fragment much lai-ger than the others, Monterey, 16 fms. All col- 

 lected by Dr. Cooper. 



No. 463, Mollusca, Survey Cabinet. 



CALLIOSTOMA, Swains. 

 Zizyphinus, Gray. 

 C. TRICOLOR, G. 



C. t. conica, spira vix elevata; anfr. I nucleari, leevi ; anfr. VI ad marginem 

 truncatis, supra declivibus, infra planulatis; tota superftcie confertim costata ; cos- 

 tis minute granulatis ; colore fulvo. lineis purpuras albo maculatis, spiraliter fas- 

 ciato ; apertura subquadrata, intus margaritacea ; labio crasso, labro acuto ; um- 

 bilico albo. 



Long. - 45, lat. - 5, long. aper. T9, lat. aper. "24. 



