22 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
that they are the chief food of the whale-bone whale; and our fishermen, 
who call them by the name of whale food, are of the same opinion. 
Range. N. Bering Sea, Pribilof Islands. Circumboreal. 
Clione elegantissima Dali, 1871 
American Journal of Conchology, 7:139. 
Pinnae small, pink, with translucent margins, a ray of bright crimson 
in the center of each, subtriangular. Body pyriform, slender caudal end 
usually curved to one side; a patch of brownish crimson with well-defined 
edges, on the back, ventral side and tail, brownish pink. Head well- 
differentiated, longitudinally striped with carmine on a lighter ground. 
Tentacles two, short, cylindrical, brownish. Cephalic lobes six, thick, 
leaf-like, short, covered with fine granulations or pores on their anterior 
sides, which are flattened and of the most brilliant carmine. Disk cleft 
in the median line. Mouth with two broad carmine labia. Length, 28; 
breadth of pinnae, 22 in. (Dali.) 
Type in United States National Museum. Type locality, Pacific Ocean, 
in lat. 51° SO' N., long. 161° 26' W. 
Range. South of the Aleutian Islands, in lat. 51° 50' N., long. 
161° 26' W. 
Family PNEUMODERMATIDAE 
Genus PNEUMODERMA Cuvier, 1804 
Body fusiform; head furnished with ocular tentacles; lingual teeth 
4.0.4; mouth covered by a large hood supporting two small, simple, and 
two large acetabuliferous tentacles; suckers numerous, pedicillate, neck 
contracted; fins rounded; foot oval, with a pointed loge, which has small 
branchial processes, and a minute rudimentary shell. (Woodward, Manual 
of the Mollusc a.) 
Type. Pneumoderma peronii Lamarck. 
Distribution. Atlantic, Indian, Pacific oceans. 
Pneumoderma pacifica Dali, 1871 
American Journal of Conchology 7:139. Challenger Voyage, Reports. Pteropoda; 
PI. 2, figs. 4, 5. 
Body subcylindrical, elongated, rounded behind, livid purple. Pinnae 
subquadrate, arched at their inner anterior margin, deeply notched at 
their inner posterior edge. Anterior margin with a well-marked band of 
white, remainder dull purple, lighter behind. Head indistinct, cylindrical. 
Oral aperture deeply notched the median line below, entire above. Ten¬ 
tacles two, small, short, distant on the back of the head. Proboscis swollen 
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