44 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
surface; whorls flattened behind the shoulder; major spirals obsolete or 
none; when present, there is one on the penultimate whorl and five or six 
on the last whorl; aperture large, outer lip flaring, umbilical chink usually 
concealed by the callus. (Dali.) 
Type in United States National Museum. Type locality, rocks exposed 
to the surf, coast of Washington. 
Range. Known only from type locality. 
Thais lamellosa sitkana Dali, 1915 
Proceedings of the United States National Museum, 49:566; PI. 74, fig. 4. 
Shell resembling var. hormica, but smaller and thinner, the spire pro- 
duced, subarcuate, longer than the aperture; whorls rounded, with no 
lamination; major spirals conspicuous, two on the penultimate, five or six 
on the last whorl; aperture small, outer lip not reflected, usually with a 
deep umbilical chink. Height of shell, 38; of last whorl, 25; breadth, 
18 mm. (Dali.) 
Type in United States National Museum. Type locality, inner harbor, 
Sitka, Alaska. 
Range. Known only from type locality. 
Thais lima Martyn, 1784 
Plate 36, figs. 4, 5, 6 
Universal Conchology, Figures of Nondescript Shells; Table 2, PI. 46. Proceedings of 
the United States National Museum, 49: 566; PI. 75, figs. 4-6. 
Shell of three and a half to four rounded whorls, not including the 
nucleus; moderately thick with a spire much shorter than the aperture, 
the last whorl much the largest; with a tolerably uniform spiral sculpture 
of alternated major and minor spiral cords; aperture large, outer lip not 
reflected and seldom thickened, more or less crenulated by the sculpture; 
pillar slightly arcuate, flattened anteriorly, the canal narrow and curved to 
the left; umbilicus sometimes sealed, at others showing a deep narrow 
perforation behind the callus of the reflected pillar. Height of shell, 60; 
of last whorl, 54; breadth, 36 mm. (Dali.) 
Type in Martyn Collection. Type locality, King Georges Sound. 
Range. Kutzebue Sound, Arctic Ocean, to Bering Strait, Kamchatka, 
the Kuriles, and Japan; east to the Aleutian Islands; Monterey to San 
Diego, California, and Cerros Island, Lower California. 
Thais emarginata Deshayes, 1839 
Plate 36, figs. 2, 3 
Revue de la Zoologique, SocietS Cuvierienne, 360. Guerin, Magasin de Zoologie, 1841 ; 
PI. 25. 
Testa ovata, apice acuta, transversim costata, irregulariter squamoso- 
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