138 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
separated by a single thread from the suture; outer lip thin, produced, 
sharp; inner lip erased, pillar straight; canal distinct, rather wide and 
recurved. Height of shell, 12; of last whorl, 3.5 ; diameter 3 mm. (Dali.) 
Type in United States National Museum, No. 211334. Type locality, 
Station 2902, off Santa Rosa Island, California. 
Range. Off Santa Rosa Island, California, in 53 fathoms. 
Mangilia oenoa Dali, 1919 
Proceedings of the United States National Museum, 56:66; PI. 8, fig. 6. 
Shell small, feebly sculptured, whitish with a yellowish underlying, 
and (on the spire, one; on the last whorl, two) darker spiral lines; whorls 
six without the (lost) nucleus; suture distinct, anal fasciole obscure; sur¬ 
face with uniform fine spiral striation; axial sculpture of (on the last 
whorl, about 15) faint narrow riblets extending entirely over the whorl 
with wider interspaces; aperture narrow, canal short, wide; anal sulcus 
faint; outer lip thin, sharp, body and pillar smooth. Height of shell, 
6.5; of last whorl, 4; diameter, 2.5 mm. (Dali.) 
Type in United States National Museum, No. 153051. Type locality, 
San Pedro, California. 
Range. San Pedro, San Diego, California, to Gulf of California. 
Mangilia alesidota Dali, 1919 
Proceedings of the United States National Museum, 56 :304. 
Shell small, yellowish, with, on the last whorl, a faint, dark band in 
front of the suture and an obscure, dark line at the periphery, with a 
dark flush on the canal; with six whorls, including a minute, smooth 
nucleus followed by a minutely reticulated second whorl, and then by 
the adult sculpture; suture distinct, slightly appressed, the anal fasciole 
occupying the space between it and an angular shoulder; axial sculpture 
of (on the penultimate whorl, 15) narrow, sharp, arcuate ribs extending 
from the suture over the periphery, with wider interspaces; there are 
also minute incremental lines roughening the spirals; spiral sculpture of 
numerous minutely-channeled grooves with wide flattish interspaces (the 
latter sometimes with a smaller median groove) covering the whole sur¬ 
face; aperture narrow, with a wide, very shallow anal sulcus; outer lip 
thin, sharp, body erased, pillar straight, axis pervious, gyrate; canal hardly 
differentiated. Height of shell, 7.5; of last whorl, 5.2; of aperture, 3.5; 
diameter, 3 mm. (Dali.) 
Type in United States National Museum, No. 56913. Type locality, 
Catalina Island, California. 
Range. Known only from type locality. 
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