188 PROCEEDINGS OF THE CALIFORNIA 



EMARGINULA, Lam. 



E. BELLA, G. 



E. t. alba, oblongo-ovalis, subelevata, antice parum convexa, postice excavata, 

 parte anteriori angustiori ; apice excentrico, prominente, parum recurvato ; sinu 

 mediocri ; costis radiantibus circiter XIX cum costis minoribus interstitialibus 

 irregularitur alternantibus, per lineas concentricas clathratis. 



Long. '55, lat. -36, alt. 22. 



Shell oblong oval, somewhat elevated, narrowest anteriorly ; apex excentric, 

 posterior, prominent and somewhat recurved ; outline in front of the apex slightly 

 convex, from the apex to the posterior margin slightly excavated, sides descend- 

 ing nearly straight ; sinus moderate, variable, situated at the extremity of a 

 strong rib ; surface ornamented by about nineteen large radiating ribs, with smaller 

 ones interposed, all crossed by moderately prominent concentric ridges ; color 

 white. 



Locality Monterey, Dr. Cooper. " Two dredged dead." 



No. 466, Survey Mollusca. 



GADINIA, Gray. 

 S. Gen. Roicellia, Cooper. 



Animal tentaculis ultra testam porrectis, latis, compressis, margine anteriori ro- 

 tundato, pectinato ; pes mediocris, circularis. 



Testa Gadinite similis. 



Animal with broad flat tentacles, rounded and pectinated in front, projecting 

 beyond the shell ; foot moderate, round. Shell as in Gadinia. 



G. (R.) RADIATA, Cooper. 



Animal album ; testa sub-circularis ; apex centralis ; color albus vel ex albo vi- 

 rens ; superficies XXX costis radiantibus dichotomis induta, per lineas concentri- 

 cas cruciatis ; intus alba vel livida, margine crenulato ; fovea siphonalis bene im- 

 pressa, 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, Hall Moon Bay, New Year's Point, Santa Barba- 

 ra and Santa Catalina Islands. Cooper and Rowell. 



No. 826, Mollusca, Survey Cabinet. 



TYLODINA, Raf.  



1 T. FUNGINA, G. 



T. testa sub-elliptica, elevata; apice sub-centrali; epidermide rufo-brunnea, prope 



