from the West Coast of North America. 



Opalia bullata. 



0. testa minore, alba, subdiaphana, turrita, gracili ; marginibus spirse 

 subrectis ; tota superficie minutissime et creberrime spiraliter 

 striolata ; vertiee nucleoso declivi, celato ; dein anfr. ii., globosis, 

 radiatim baud sculptis ; dein v. normalibus, pianatis, suturis vix 

 impressis; lirulis radiantil)us circ. xxvi., baud nisi in anfr. primis 

 exj)ressis, circa basim irregu.ariter rotundatam ad axim continuis ; 

 serie bullularum suturalium anfr. primis e lirulis extantibus for- 

 mata, postea lirulis baud convenientibus, anfr. penult, circ. xvii., 

 pianatis, super suturas parieti appressis, interstitiis baud infossis ; 

 basi subangulata, baud costata; apertura subovali, sinistrorsum 

 subplanata ; peritremate continue, calloso ; labro baud sinuato. 

 Long. -3, long. spir. -21, lat. '09, div. 20. 



Hub. Sta. Barbara, one specimen (Jewett). 



422. Cerithiopsis purpurea. 



C. testa compacta, baud gracili, marginibus spirse panim excurvatis; 

 purpurea seu fusco-purpurea, cirta periphenam pallidiore ; anfr. 

 nucl. ? ii., leevibus ; norm, vii., pianatis, suturis impressis ; serie- 

 bus iii. noclulorum minorum supra costulas spirales minores, ad 

 intersectiones costularum radiantium circ. xxiii., lineis fere rectis, 

 ad suturas interruptis, spiram asceiidentium sitis ; interstitiis im- 

 pressis, quadratis ; costulis suturalibus ii. baud nodulosis ; basi 

 rotundata, antice lirulis paucis expressis inter eas et costulas su- 

 turales vix sculpta ; apertura subquadrata ; columella torta, emar- 

 ginata. Long. -29, long. spir. '19, lat. -1, div. 20. 



Hab. Sta. Barbara (Jewett); Monterey, San Diego (Cooper). 



423. Cerithiopsis fortior. 



C. testa C.purpurece simili, sed sculptura multo fortiore, basi pallida; 

 seriebus nodulorum spiralibus testa adolescente ii., postea iii. ; costis 

 radiantibus circ. xiii., interstitiis magnis ; costis suturalibus validis, 

 subnodosis ; costa basali valida. Long. *3, long. spir. *2, lat. *11, 

 div. 26. 



Hab. Sta. Barbara, 1 specimen (Jewett). 



439. Marginella subtrigona. 



M. testa M . Jewettii simili, sed multo curtiore, latiore ; antice valde 

 angustata, postice valde tumenie ; labro postice minus prolongato; 

 pbcis iv., validioribus, parietali una. Long. *14, long. spir. '01, 

 lat. -11, div. 130. 



Hab. Sta. Barbara (Jewett). 



440. Marginella regutaris. 



M. testa M. Jewettii simili, sed multo minore, paullum angustiore ; 

 tenui, nitidissima, crystallina, oi/mino diaphana ; labio magis cal- 

 loso. Long. -13, long. spir. -01, lat. -09, div. 120. 



Hab. Sta. Barbara (Jewett) ; coast of California south from 



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