CLASS GASTROPODA 
17 
Griinde durch die Zuwachslamellen in Facherchen abgetheilt. Das eine der 
Examplare zeigt Andeutungen zu sanftwelligen Querfalten der Windun- 
gen des Gewindes. Der Kanal wird durch eine Lamelle verlegt, welche 
von der Spindel her sich iiber denselben lagert, und den Kanal fast vollig 
verdeckt. Die Substanz der Schale selbst ist weiss, und letstere erhalt 
ihre Farbe allein von der braungelben Aussenschichte her. Long., 18; 
lat., 9; alt., 11 ,* lat. aperture, 5 mm. (Middendorff.) 
Shell of medium size, fusiform; whorls six, convex, slightly angulated 
near posterior margin; upper whorls with several transverse ridges; sur¬ 
face ornamented with numerous rounded, raised lines; suture deeply im¬ 
pressed, distinct; body-whorl not extraordinarily ventricose; aperture 
subovate; outer lip thickened, denticulated; inner lip incrusted; columella 
widened; umbilicus subperforate; canal narrow, sometimes covered with 
overgrowing lips. (Arnold.) 
Type in Academy of St. Petersburg. Type locality, Sitka, Alaska. 
Range. Sitka, Alaska, to Santa Barbara, California. Fossil: Pleisto¬ 
cene—San Pedro, San Diego, California. 
Tritonalia lurida aspera Baird, 1863 
Plate 32, fig. 1 
Proceedings, Zoological Society of London, 72. 
Vit. testa fusiformi, purpurea, scabra, elongata, longitudinaliter plicato- 
costata, transversim lirata, liris crebris et minutissime squamatis; an- 
fractibus sex, ultimo trientes duos longitudinis testae adequante, in canalem 
rectum, longiusculum, apertum, desinente; columella planulata, fauce 
albida; labro externo intus dentato, extus serrato; operculo oblongo, nucleo 
in margine externo sito. Long., 1; lat., ^4 in. (Baird.) 
Vit. with fusiform shell, purplish, rough, elongate, longitudinally pli¬ 
cate-costate, transversely lirate, with the ribs frequently and minutely 
scaly; with six whorls, the last equaling two-thirds of the length of the 
shell, ending in a straight, longish, open canal; columella flattened, with 
white cheek; outer lip dentate within, serrated without; operculum oblong, 
with nucleus situated on the external margin. (Translation.) 
Type in British Museum. Type locality, Esquimalt Harbor, Vancouver 
Island, British Columbia. 
Range. Sitka, Alaska, to San Pedro, California. 
Tritonalia lurida rotunda Dali, 1919 
Proceedings of the United States National Museum, 56:333. 
Shell small, short, much inflated, solid, with four or more whorls, the 
apex eroded; suture appressed, obscure; axial sculpture incremental, ir- 
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