Animal album; testa sub-circularis; apex centralis; color albus vel ex albo virens; superficies XXX costis radiantibus dichotmis induta, per lineas concentricas cruciatis; intus alba vel livida, margine crenulato; fovea siphonalis bene impressa, margo prope extremam foveam parum incisus. Long. ·90, lat. ·85, alt. ·45. Animal white; shell sub-circular; apex central or sub-central; color white to greenish externally, internally white, livid or various shades of a light purple; surface marked by about thirty radiating and sometimes dichotomous ribs crossed by irregular concentric lines; internal margin crenulated, the teeth corresponding to the external ribs; muscular scar horseshoe-shaped with a little supplementary scar adjoining the left limb; siponal groove rather strongly impressed, producing a very faint emargination on the edge of the shell. Localities, Farallone Islands, Half Moon Bay, New Year’s Point, Santa Barbara and Santa Catalina Islands. Cooper and Rowell. No. 826, Mollusca, Survey Cabinet. TYLODINA, Raf. ? T. FUNGINA, G. T. testa sub-elliptica, elevata; apice sub-centrali; epidermide rufo-brunnea, prope apicem lutea, ultra marginem testæ projecta; intus lutea, prope marginem cærulescens. Long. 1·3, lat. 1·1, alt. ·5. Animal unknown, shell sub-elliptical, elevated; apex sub-central, blunt; epidermis reddish brown, yellowish on and near the apex, projecting beyond the margin of the shell; color internally straw yellow, shading towards the margin into a bluish white. The above measurements are approximate, making allowance for the epidermis which in the dry specimen is contracted and incurved around the margins to a width of about a tenth of an inch. A single specimen, fresh, though without the animal, was found by Dr. Cooper on the shore of Santa Barbara Island. No. 994, Mollusca, Survey Cabinet. CIRCE, Schum. S. G. _Lioconcha_, Morch. C. (L.) NEWCOMBIANA, G. C. t. tenui, trigono-ventricosa, polita, minute et concentrice striata; apicibus magnis, subcentralibus; lunula haud profunda, cordata, margine arata; colore gilvo, lineis angulatis, rufis pieto; intus pallida. Long. 1·2, lat. 1·37, alt. ·45. Shell thin, trigonally ventricose, polished, marked by minute concentric striæ; beaks large, subcentral; anterior end prominent, narrowly rounded, posterior a little the widest, base convex; lunule not excavated, bounded by an impressed line; color yellowish white, variously lined with brown angular lines; interior whitish; internal margin smooth; hinge teeth delicate. Hab. two valves, Catalina Island, 120 fms. Dr. Cooper. No. 1058, Mollusca, Survey Cabinet.