140 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
This has a chestnut and a white band. (Carpenter.) 
Type in British Museum? Type locality, Santa Barbara, California. 
Range. Monterey, California, to Magdalena Bay, Lower California. 
SECTION KURTZILLA Dali, 1918 
Mangilia arteaga Dali and Bartsch, 1910 
Canadian Geological Survey, Memoranda, No. 1143, 11; PI. 11, fig. 4. 
Shell small, acute-fusiform, having about eight whorls, the initial 
whorl extremely minute, subsequent whorls slowly enlarging, minutely 
reticulate. The later whorls have a strongly marked shoulder, and are, 
when young, of a reddish-brown color, which gradually changes with 
exposure to a light gray. The sculpture of the adult whorls consists of 
(on the last whorl, about ten) prominent, slightly arcuate, nearly axial 
ribs, rather sharply nodose at the intersection with the angle of the shoul¬ 
der, with wider interspaces and continuous to the canal. As to spiral 
sculpture of major and minor threads, there are about ten of the former 
in front of the shoulder, of which two are visible behind the suture on 
the spire; the remainder—which are much finer and minutely rugose— 
occupy the interspaces of the whole surface, the major threads being 
slightly swollen where they cross the ribs; aperture narrow; anal sinus 
shallow, and small; pillar and throat brownish, with a brown obscure 
band under the suture; outer lip sharp between, and thickened at the 
varices; canal short, and wide; operculum, none. Height of shell, 10.25; 
of last whorl, 6.5; of aperture, 4.6; maximum diameter, 4 mm. (Dali.) 
Type in Ottawa. Type locality, Barkley Sound, Vancouver Island. 
Range. Vancouver Island, B. C., to San Diego, California. 
Mangilia arteaga roperi Dali, 1919 
Proceedings of the United States National Museum, 56:64; PI. 22, fig. 5. 
Shell small, thin, grayish, with a very minute apical followed by two 
more or less reticulate convex nuclear whorls and four and a half subse¬ 
quent whorls; suture distinct, not appressed; spiral sculpture of, on the 
upper whorls, one strong peripheral cord in front of which, on the penul¬ 
timate whorl, is a smaller one and, on the last whorl, about five smaller 
ones with wider interspaces; on the canal, five or six closer, small threads; 
in the interspaces of the major cords are numerous minute and minutely 
imbricated, close-set threads, giving a rasp-like surface; axial sculpture of 
(on the last whorl, nine) narrow rounded threads with wider interspaces, 
extending from the fasciole to the canal and nodulous at the intersection 
[ 140 ] 
