CLASS GASTROPODA 
197 
edged; operculum brown, multispiral, horny; height, 1.7; longer diameter, 
2 mm. (Dali.) 
Type in United States National Museum, No. 173803. Type locality, 
Catalina Channel, California. 
Range. Catalina Channel, California. 
Solariella nuda Dali, 1895 
Plate 91, figs. 2, 5 
Proceedings of the United States National Museum, 18:9. Bulletin, Museum of Com¬ 
parative Zoology, 43: PI. 3, figs. 5, 7. 
Shell turbinate, recalling Margarita , smooth, polished, except for ob¬ 
scure spiral markings which do not interrupt the surface, of about four 
whorls; color white, with a pink or blue nacre glowing through; whorls 
rounded, flattened in front of the suture; base rounded; umbilical margin 
keeled; umbilicus wide, funicular; aperture rounded, oblique, hardly angu- 
late by the umbilical rib, and with a very short interruption between the 
inner and outer lips; operculum light brown, thin, with about ten whorls. 
Height, 15; major diameter, 19; minor diameter, 15.5 mm. (Dali.) 
Type in United States National Museum, No. 122580. Type locality, 
U.S. Fish Commission Stations 2928, 3187, and 3348, in 298 to 455 
fathoms off Lower California. 
Range. Monterey, California, to Clarion Island. 
Subgenus Machaeroplax Fride, 1877 
Solariella varicosa Mighels and Adams, 1842 
Boston Journal of Natural History, 4:46; PI. 4, fig. 14. 
M. testa parva, tenui, conica; anfractibus quatuor, convexis; longi- 
tudinaliter costulatis, transverse striatis; sutura subcanaliculata; umbilico 
magno, profundo. 
Shell small, thin, low, conical, of a dingy white or drab color; whorls 
four, convex, covered with numerous longitudinal, oblique ribs, intersected 
by a great number of transverse, revolving striae, which are most con¬ 
spicuous on the lower part and base of the lower whorl. The striae on 
the upper part of the whorls can only be seen with a magnifier. Suture 
distinct, subcanaliculate; umbilicus rather large and deep, bounded by two 
rather rugged varices, intersected by the ribs which are continued to the 
verge of the umbilicus; aperture circular; labrum simple, sharp; within 
perlaceous. Height, .25 inch; diameter of base equal to the height; diver¬ 
gence, 90°. (Mighels and Adams.) 
[799 ] 
