CLASS GASTROPODA 
255 
scabra, antice apulo latior, convexiuscula subcarinata, carina tamen anter 
extremitates definente, composita ex 8 valvulis retrorsum imbricatis (ita 
vi postica semper abticae subiecta sit lobis 2 acumintis lateralibus) margine 
antico rotundatis, postico subsinuatis, carinae apice tamen medio promi- 
nente striis minutis marginis anticae figuram describentibus striatis. Val- 
vula postrema tamen a reliquis distert, quod tarn postice quam antice rotun- 
data sit, et strias totum circuitum describentes habeat. (Fabricus.) 
Shell oblong or oval, elevated, rather acutely angular; buff, closely 
speckled and maculated with dark red, as in Trachydermon ruber. Sur¬ 
face densely, microscopically granulated, but apparently smooth. Lateral 
areas not distinct. Valves beaked, umbo of posterior valve slightly promi¬ 
nent, central. Interior rose tinted; anterior valve eight or nine slits. Sutural 
plates broad, rounded; sinus deep, angular. Girdle leathery, nude. The 
gill rows extend forward three-quarters the length of the foot, each con¬ 
taining 20-25 branchiae. Length, 40; breadth, 24 mm. Length, 27 ; breadth, 
16 mm. (Tryon and Pilsbry, Manual of Conchology .) 
Type in Zoology Museum, Copenhagen. Type locality, not known to 
writer. 
Range. Circumboreal. Arctic and Bering Seas; Aleutian Islands 
south to Forrester Island, Alaska; also Japan. 
Lepidochitona submarmorea Middendorff, 1848 
Bulletin, Imperial Academy of Sciences, St. Petersburg, 6; No. 8, 120. Sibirischc Reise, 
178; PI. 14, figs. 7, 10. Tryon and Pilsbry, Manual of Conchology, 14:42 ; PI. 10, 
figs. 16-24. 
Shell oval, rather depressed, rather smooth and shining, the entire 
surface seen under a lens to be very minutely, regularly, and closely 
granulose. Lateral areas scarcely distinct, slightly swollen. Color rosy or 
yellowish-white, closely painted with spots and flames of red. Interior 
rose-colored; terminal valves each with five slits. Girdle smooth, shining, 
yellow or brown. Length, 38; breadth, 24; alt., 12-13 mm. (Tryon and 
Pilsbry, Manual of Conchology .) 
Type in Academy, St. Petersburg. Type locality, not known to writer. 
Range. Aleutian Islands to Puget Sound; also Okhotsk Sea and 
Japan. 
Lepidochitona lineata Wood, 1815 
General Conchology, 15; PI. 2, figs. 4, 5. 
Ch. testa octovalvi laevi, valvis lineatis, limbo lato coriaceo. 
Shell of eight smooth valves, valves streaked, margin broad and cori¬ 
aceous. The ground color of this elegant shell is bright chestnut, with an 
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