CLASS GASTROPODA 
59 
Family ONCHIDIIDAE 
Genus ARCTONCHIS Dali, 1905 
Species small, like Onchidella, but without muciparous glands on the 
lower side of the mantle, without dorsal eyes and with a jaw. (Dali.) 
Type. Onchidella borealis Dali. 
Distribution. Cool temperate and boreal coasts. 
Arctonchis borealis Dali, 1871 
American Journal of Conchology, 7:135. Proceedings, Philadelphia Academy of Nat¬ 
ural Sciences, 1876; PI. 6, fig. E. 
Animal small, black, with dots and streaks of yellowish-white, foot 
light-colored, also muzzle and tentacles. Back regularly rounded, but a 
little pointed in the middle; smooth or very finely granulose, tough and 
coriaceous. Eyes globular, blue, on very short constricted tentacles. 
Muzzle short, rounded-transverse. Iiead not produced beyond the anterior 
edge of the mantle. Sexual appendages on the right side, near the head. 
Foot ovate, narrow, rather roundly pointed behind. Long., .3 inch. (Dali.) 
Type in United States National Museum. Type locality, Sitka, Alaska, 
on rocks near tide marks, especially on the small islets in the Bay. 
Range. Port Moller and Aleutian Islands to northern California. 
Described as Onchidella borealis Dali. 
Family TEREBRIDAE 
Genus TEREBRA (Bruguiere, 1789) Lamarck, 1799 
Subgenus Strioterebrum Sacco, 1891 
Shell with uniform sculpture, relatively small, acute, a strongly marked 
presutural sulcus and band, whorls flattish with axial ribs and spiral 
sculpture, short canal or none, usually two keels on the pillar; the body 
is destitute of callus and without a raised pillar lip. (Dali.) 
Type. Tercbra maculata Lamarck. 
Distribution. Mostly tropical; East Indies, west and east coast of 
America. Fossil: Eocene .... 
Terebra pedroana Dali, 1908 
Plate 6, fig. 6 
Bulletin, Museum of Comparative Zoology, 43: No. 6, 251. 
Shell small, slender, acute, apex (slightly decollate) ; subsequent 
whorls flattened, about eleven in number, the sutural band, on the early 
[ 59 ] 
