CLASS GASTROPODA 
137 
whorl in front of the anal fasciole there are about a dozen similar cords 
extending to the end of the canal with about equal channeled interspaces, 
the posterior two or three cords more or less nodulous at the intersections; 
axial sculpture of about 10 more or less prominent riblets beginning in 
front of the fasciole and extending slightly over the periphery on the 
last whorl becoming obsolete; the incremental lines not conspicuous; 
aperture narrowly ovate, the outer lip somewhat varicose with a large 
shallow rounded anal sulcus close to the suture; within both inner and 
outer lips are smooth and moderately callous; canal short, wide, slightly 
recurved. Height of shell, 10.5; of last whorl, 6; diameter, 4 mm. (Dali.) 
Type in United States National Museum, No. 211326. Type locality, 
Station 2902, off Santa Rosa Island, California. 
Range. Off Esteros Bay, California, to Coronado Islands, Mexico. 
Mangilia cesta Dali, 1919 
Proceedings of the United States National Museum, 56:71; PI. 21, fig. 7. 
Shell small, whitish, polished, with (on the last whorl, six or seven) 
widely spaced, narrow, brown, spiral lines; whorls six without the (lost) 
nucleus; suture distinct, axial sculpture of ten rounded ribs extending 
across the whorl with subequal or wider interspaces; the ribs are not 
shouldered and start from the suture which they undulate; spiral sculpture 
of incised lines in the interspaces between the ribs, the brown color is 
situated in these grooves of which there are six or more on the last whorl, 
rather widely spaced; aperture simple, anal sulcus inconspicuous, canal 
very short and wide. Height of shell, 7; of last whorl, 4; diameter, 
5 mm. (Dali.) 
Type in United States National Museum, No. 209040. Type locality, 
San Pedro, California. 
Range. Known only from type locality. 
Mangilia evadne Dali, 1919 
Proceedings of the United States National Museum, 56:69; Pi. 23, fig. 2. 
Shell small, white, slender, with a smooth swollen nucleus of one and 
a half whorls and five subsequent whorls; suture constricted, distinct not 
appressed, the whorls sloping flatly toward it on both sides; axial sculp¬ 
ture only of faint incremental lines; spiral sculpture of one very prominent 
keel at the shoulder with one smaller and several still finer threads behind 
it, the anal fasciole smooth; on the last whorl there are two major threads 
with much wider interspaces, in front of them about six smaller closer 
threads to the canal which has about six close-set threads and a marked 
siphonal fasciole; aperture rather narrow, the anal sulcus deep, rounded, 
I 137 1 
