164 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
elongated, obtuse or truncated in front; columella plicate; outer lip with 
a thick marginal varix, its inner margin smooth or crenulated. (Tryon, 
Structural and Systematic Conchology .) 
Types. Marginalia nubecidata and Marginella persicula. 
Distribution. Tropical and subtropical; Caribbean West Africa, Indo- 
Pacific, east and west coasts of America, Brazil, China, West Indies. 
Fossil: Cretaceous ( ?), Eocene—; United States, Europe, Australia. 
Marginella jewettii Carpenter, 1856 
Proceedings, Zoological Society of London, 207. Tryon, Manual of Conchology, 5; 
PL 12, fig. 57. 
M. t. parva, alba, ovoidea; spira depressa, celata, antice angustiore, 
postice tumidiore; labro vix incressato, medio inflexo, supra calloso, callo- 
sitate suturam et anfr. penult, tegente; labio iv-plicato, et supra dentato. 
Long., .18; long., spira. (super sutram), .03; lat., .12. (Carpenter.) 
Marginella with small shell, white, ovoid; spire depressed, suture con¬ 
cealed, in front rather narrow, in the rear more tumid; outer lip scarcely 
thickened, in the middle inflated, above callous, with the callus covering the 
suture and last whorl; inner lip quadriplicate, and dentate above. (Trans¬ 
lation.) 
Type in British Museum. Type locality, Santa Barbara, California. 
Range. Monterey to San Diego, California. 
Marginella subtrigona Carpenter, 1865 
Annals and Magazine of Natural History, series 3, 15:397. Tryon, Manual of 
Conchology, 5; PI. 12, fig. 55. 
M. testa M. jewettii simili, sed multo curtiore; antice valde angustata, 
postice valde tumente; labro postice minus prolongato; plicis iv., validiori- 
bus, parientali una. Long., 14; long, spir., .01; lat., .11 poll. (Carpenter.) 
Like M. jewettii , but much shorter and wider. (Tryon, Manual of 
Conchology .) 
Type in British Museum. Type locality, Santa Barbara, California. 
Range. Monterey to San Diego, California. 
Marginella regularis Carpenter, 1865 
Annals and Magazine of Natural History , series 3, 15: 398. Tryon, Manual of 
Conchology, 5; PI. 12. fig. 56. 
M. testa M. jewettii simili, sed multo minore, paullum angustiore; 
tenui, nitidissima, crystallina, omnino diaphana; labio magis callosa. Long., 
.13 ; long, spir., .01; lat., .09 poll. (Carpenter.) 
Thin, glassy white or yellowish; narrower than M. jewettii; lip-margin 
rather thick. (Tryon, Manual of Conchology.) 
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