CLASS GASTROPODA 
143 
ing a slight shoulder to the whorl in front of it; spiral sculpture of fine 
close scabrous, revolving threads over the whole surface; aperture narrow, 
outer lip thin, simple, with a wide, shallow anal sulcus, the body erased, 
the pillar straight, attenuated in front, canal short, hardly differentiated. 
Height of shell, 11; of last whorl, 6.5; of aperture, 5; diameter, 3.5 mm. 
(Dali.) 
Type in United States National Museum, No. 133910. Type locality, 
San Diego, California. 
Range. Known only from type locality. 
SECTION CLATHROMANGILIA Monterosato, 1884 
Mangilia interlirata Stearns, 1871 
Proceedings of the California Academy of Sciences, 4:226; PI. 1, fig. 10. 
Shell of a dark, reddish brown, small, solid, slender, fusiform; whorls, 
eight, prominently sculptured with 8-10 strong, longitudinal and 10-12 
threadlike, revolving ribs, the latter of a darker shade and meeting, but 
not crossing, the former; aperture linear, less than half the length of the 
shell; outer lip simple, somewhat thickened, externally and posteriorly 
slightly notched. Long., .27; lat., .09 in. (Stearns.) 
Type in United States National Museum. Type locality, Monterey, 
California. 
Range. Monterey to Catalina Island, California. 
Mangilia rhyssa Dali, 1919 
Proceedings of the United States National Museum, 56 :62; PI. 21, fig. 1. 
Shell small, brownish, coarsely sculptured, with six whorls exclusive 
of the (lost) nucleus; suture appressed, somewhat constricted, obscure; 
upper whorls with two prominent cords crossing the ribs without nodula- 
tion, the last whorl with six, the spiral sculpture more prominent than 
the axial, which consists of (on the last whorl, 10) straight axial ribs 
continuous to the base; there are traces of some fine spiral striation; the 
interstices of the reticulation are deep and squarish; sutural fasciole 
obscure, the sulcus very shallow, the aperture short, with hardly any 
canal and no denticulations or lirations. Height of shell, 7; of last whorl, 
4; diameter, 2 mm. (Dali.) 
Type in United States National Museum, No. 55479. Type locality, 
near San Diego, California. 
Range. San Diego, California, to Gulf of California. 
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