136 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
whorl, ten, strong, squarish ribs and numerous fine and occasionally im¬ 
pressed lines of growth; longitudinal sculpture of a distinct angulation of 
the whorl, in front of the anal fasciole, which on the transverse ribs 
develops into stout swellings, which in the earlier whorls are connected 
by an obscure rib; the whole surface of the whorl is covered with rather 
wide and shallow grooves and their even wider interspaces; the grooves 
are closest and finest on the canal and behind the angulation, and faintest 
or nearly absent on the periphery; anal notch very shallow, fasciole nearly 
obsolete. Operculum short, triangular, yellowish-brown. Greatest length 
of shell, 12.3; of aperture, 5.5; greatest width of shell, 4.5 mm. (Dali.) 
Type in United States National Museum. Type locality, Aleutian 
Islands. 
Range. Chiachi Islands to Port Etches, Alaska. 
Mangilia beta Dali, 1919 
Proceedings of the United States National Museum, 56:64; PI. 22, fig. 4. 
Shell small, yellowish, with a pale canal, a blunt smooth nucleus of two 
whorls and three and a half subsequent whorls; periphery slightly behind 
the middle of the whorl; from the distinct suture the surface slopes flatly 
to the subangular periphery, the rest of the whorl rounded; spiral sculp¬ 
ture of uniform fine threads with narrower interspaces over the whole 
surface; axial sculpture of (on the last whorl, 15) narrow rather sharp 
ribs with much wider interspaces, obsolete behind the shoulder and on 
the base; there are also fine incremental lines which roughen the spiral 
threads; anal fasciole inconspicuous, anal sulcus feeble; aperture simple, 
outer lip sharp; axis pervious, pillar attenuated in front, canal short. 
Height of shell, 5; of last whorl, 3; diameter, 2 mm. (Dali.) 
Type in United States National Museum, No. 206554. Type locality, 
off Point Ano Nuevo, California, in 67 fathoms. 
Range. Point Ano Nuevo, California, to Coronado Islands. 
Mangilia eriphyle Dali, 1919 
Proceedings of the United States National Museum, 56:69. 
Shell small, solid, whitish, acute, fusiform, with one and a half nuclear 
and six subsequent whorls; nucleus with a minute apex and a swollen 
smooth globular succeeding whorl; these are followed by a peripherally 
keeled whorl, the subsequent turns developing two and then three spiral 
flattish spiral cords, including the peripheral one and in front of it, while 
behind the keel the surface slopes flatly up to the appressed suture, only 
interrupted by obscure ridges due to the axial sculpture; on the last 
[1361 
