CLASS GASTROPODA 
271 
radiantibus circ. xx. angustis, vix extantibus, parum flexuosis; sculptura 
spirali nulla; apertura quadrata; labro acuto deorsum tumente, postice 
sinuato; labio conspicuo; columella torta, truncata. Long., 0.13; long, 
spir., 0.09; lat., 0.05 mm. (Carpenter.) 
Shell narrow, subcylindrical, consisting of seven moderately convex 
whorls, with close oblique longitudinal ribs and revolving striae in the 
interstices; yellowish to chocolate-brown; aperture small, broadly oval, the 
lip acute and smooth within. (Tryon, Manual of Conchology.) 
Type in British Museum. Type locality, San Diego, California, in 
shell washings. 
Range. San Pedro to San Diego, California. 
Genus COLUMBELLA Lamarck, 1799 
Shell small, with a long narrow aperture; outer lip thickened (espe¬ 
cially in the middle), dentated; inner lip crenulated. Operculum very 
small, lamellar. (Woodward, Manual of the Mollusca.) 
Type. Columbella mercatoria Lamarck. 
Distribution. India, Galapagos Islands, California, Atlantic coast, 
United States, West Indies, Mediterranean, China, Japan, Philippines, 
Australia, Polynesia. Fossil: Tertiary. 
Columbella tuberosa Carpenter, 1865 
Annals and Magazine of Natural History, series 3, 15:398. Tryon, Manual of Con¬ 
chology, 5; PI. 50, figs. 40, 41. 
A. testa A. minori simillima, sed vertice nucleoso tuberoso; anfr. iv., 
tumidis, rapide augentibus; apice minimo, margines spirae rectos parum 
superante, interdum subdecliviter sito; testa adulta interdum unicolore, 
livida seu aurantica; plerumque albida, rufo-fusco varie picta, seu macu- 
lata, seu nebulosa, seu strigata strigis radiantibus seu flexuosis, seu varie 
penicillata, saepe fascia tessellata subsuterali; anfract. norm, v., planatis, 
suturis distinctis; basi subangulata; apertura pyriformi, canali satis pro- 
longato, arcuato; labro intus acuto, deorsum quasi tumidiore, postice sinu¬ 
ato, intus circ. octodentato; labio parum conspicuo, vix rugulato; colu¬ 
mella torta, axi antice striato; superficie laevi, seu interdum minutissime 
sub lente radiatim striolata; epidennide cornea, tenui, subdiaphana, spirli- 
ter sub lente minutissime striolata; operculo Nassaeformi, parvo, margini- 
bus irregulariter serratis, cicatrice bilobata. Long., .32; long, spir., .18; 
lat., .14 poll. (Carpenter.) 
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