36 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
Atys casta Carpenter, 1864 
Annals and Magazine of Natural History, ser. 3, 13:314. 
A. testa longata, tenui, subdiaphana, albida; antrorsum paulum tumi- 
diore; spira celata, lacunata, (t. adulate) baud umbilicata; columella paulum 
intorta, effusa; umbilico antico minimo; labro postice producto, obtuse 
angulato; toto superficie subtiliter spiraliter striatula. Long., .4; lat., .18 
poll. (Carpenter.) 
Shell elongated, thin, subdiaphanous, whitish; a little more swollen 
anteriorly; spire concealed, lacunate, in adult shells hardly umbilicated; 
columella a little intorted, effuse; umbilicus small; lip produced posteriorly, 
obtusely angulated; entire surface subtly spirally striatulate. (Tryon and 
Pilsbry, Manual of Conchology.) 
Type in British Museum. Type locality, Cape San Lucas, Lower 
California. 
Range. Catalina Island, California, to Gulf of California. 
Atys nonscripta A. Adams, 1850 
Thesaurus Conchyliorum , 588; PI. 125, fig. 125. 
B. testa ovato-cylindrica, alba, subpellucida, longitudinaliter striata, 
postice subtruncata, antice producta; labro subrecto; labio antice valde 
truncato, in plica dentiformi desinente. (A. Adams.) 
Shell ovately cylindrical, white, subpellucid, longitudinally striated, 
posteriorly subtruncated, anteriorly produced; outer lip rather straight; 
inner lip anteriorly strongly truncated, ending in a tooth-like plait. 
(Thesaurus Conchyliorum.) 
Type in British Museum. Type locality not given. 
Range. San Diego, California. 
Described as Bulla nonscripta. 
Family DIAPHANIDAE 
Genus DIAPHANA Brown, 1827 
Shell thin and fragile, capacious or subglobose, umbilicated, the spire 
either projecting flat, or sunken in a narrow apical umbilicus. Aperture 
narrowed above, rounded below, the lip sinuous; columella not thickened, 
long and rather straight, neither folded nor truncated, its edge a little 
reflected above. 
Type. Diaphana minuta Brown. 
Distribution. Northern United States, Europe. 
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