236 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
Simnia barbarensis Dali, 1892 
See Part III, Plate 98, fig. 4 
Proceedings of the United States National Museum, 15 : 206; PI. 21, fig. 1. 
(O. deflexa is a southern form but was reported by Col. Jewett from 
Santa Barbara. His specimen was probably the same as the form here 
figured, which is of a whitish color and does not seem to agree perfectly 
with Sowerby’s figures. I therefore separate it varietally until more is 
known. If it prove distinct from deflexa the varietal name may take 
specific rank.) (Dali.) 
In comparing the shell of S. deflexa with S\ barbarensis there are many 
differences. 5*. deflexa is longer and narrower in proportion; columella 
swollen, excavately flattened, with a line of callus at the outer edge which 
is not on S', barbarensis. 
S. barbarensis is much wider in the center, and the columella is smooth 
and rounded, extremities straight and sharp pointed; aperture wider and 
outer lip straighten (Oldroyd.) 
Type in United States National Museum. Type locality, San Pedro, 
California. 
Range. Santa Barbara to Gulf of California. 
Described as Ovula (Simnia) deflexa barbarense. 
In this species the color of its shell changes to correspond with that of 
the gorgonea on which it feeds, either yellowish white or purple. (Tryon, 
Manual of Conchology.) 
Simnia uniplicata Sowerby, 1848 
Proceedings, Zoological Society of London, 135. 
Ovul. testa elongata, subcylindrica, pellucida, minutissime striata, 
aurantia, seu violacea, antice subacuminata, postice subrotundata; dorso 
margine distincto; apertura subaperti; labio externo paululum incrassato, 
ad extremitates recedente, antice subangulato, ad canalem emarginato; 
labro interno intus subdepresso, postice spiraliter uniplicato, ad canalem, 
versus labium externum deflecto, antice subtortuo acuminato. (Sowerby.) 
Yellowish white to purplish, rather thin, transversely very minutely 
incised, or smooth, polished; narrow, with the extremities bluntly pro¬ 
duced ; lip narrow margined; posterior plication prominent. Length, 
15-18 mm. (Tryon, Manual of Conchology .) 
Type in Zoological Society Museum, London? Type locality, near 
Charleston, South Carolina. 
Range. San Pedro, California, to Magdalena Bay, Lower California; 
also West Indies, North Carolina, and Brazil. 
[ 534 1 
