CLASS GASTROPODA 
145 
Type in Museum Gray. Type locality, not known. 
Range. Catalina Island to Panama, and Galapagos Islands. 
Mangilia crebricostata Carpenter, 1865 
See Part II, Plate 15, fig. 3 
Annals and Magazine of Natural History, series 3, 15:28. 
M. testa tereti, rufo-fusca, albo zonata; anfr. nucl.(decollatis) ; 
norm. v. elongatis, subrotundatis, suturis impressis; costis radiantibus, 
obtusis, subrectis, circ. xv., spiram ascendentibus; sculptura spirali ? . . . . 
(detrita) ; apertura pyriformi, antrorsum in canalem breven attenuata; 
labro postice parum sinuato; labio conspicuo. Long., .54; long, spir., .3; 
lat., .2 poll. (Carpenter.) 
M. with shell rounded, reddish-tawney, zoned with white; nuclear 
whorl (decollate); normally 5, elongate-subrotund, with impressed 
sutures; with radial obtuse nearly straight costae, about 15 in number, 
ascending the spire; with spiral sculpture ?(worn off); with pyriform 
aperture, anteriorly attenuated into a short canal; with outer lip posteriorly 
slightly sinuated; with inner lip conspicuous. (Translation.) 
Type in United States National Museum. Type locality, Neah Bay, 
Washington. 
Range. Forrester Island, Alaska, to Monterey, California. 
Genus CYTHARELLA Monterosato, 1875 
These are the small species with thickened but not lirate or denticulate 
outer lip and pillar; the spire usually shorter than the aperture, the surface 
longitudinally ribbed, smooth, or spirally minutely sculptured; nucleus 
small, smooth. (Dali.) 
Type. Pleurotoma bertrandi Payraudeau. 
Distribution. California to Gulf of California. 
SECTION CYTHARELLA s.s 
Cytharella hexagona Gabb, 1865 
Proceedings of the California Academy of Sciences, 3:185. 
Shells small, slender, fusiformis; spire subacute, nuclear whorls two, 
smooth, normal whorls five, slightly subangular and ornamented by six 
large, acute, radiating ribs with broad, concave interspaces; besides these 
the whole surface is cancellated by minute lines; color brownish-white, 
ornamented by a few reddish-brown, revolving bands, one much larger 
than the rest, in the middle of the whorl; aperture narrow, columella 
