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ACTEONIDAE 275
5 mm. in length; body oblong, with its ends circularly rounded; upper
surface regularly arched; uniform smoke-gray in color. Fresh specimens
are needed to make a better description. Littoral to shallow water. Habits
not known.
Onchidella borealis Dall Northwest Onchidella
Alaska to Coos Bay, Oregon.
8 to 12 mm. (% inch) in length; back regularly arched but a little
pointed in the middle, smooth or very finely granulose, tough and coriaceous.
Color black or gray, with dots and streaks of yellowish white; foot light-
colored, also the head and tentacles. On rocks near high-tide mark. Gregarious.
Common.
Order TECTIBRANCHIA
(Bubble-shells, Sea-hares)
Faimly ACTEONIDAE
Genus Acteo7i Montfort i8io
External shell with a prominent spire; cephalic disk divided; operculum
thin, corneous. Erroneously spelled Actaeon.
Acteon piinctostrianis C. B. Adams Adams' Baby-bubble
Cape Cod to the Gulf of Mexico and the West Indies.
Plate 26t
3 to 6 mm. in length, solid, moderately globose, w^ith a rather high spire.
Columella with a single, twisted fold. Lower half of body whorl with nu-
merous spiral rows of fine, punctate dots. Color white. Commonly found
from low tide to 6o fathoms.
Acteon punctocaelatiis Carpenter Carpenter's Baby-bubble
British Columbia to Lower California.
lo to 2o mm. (% inch) in length, solid, oblong, 4 to 5 whorls, with
two broad, ashy or brown spiral zones and about 16 spiral grooves on the
body whorl. Columella obliquely truncated at base, and with one spiral
fold. Base stained orange. Commonly found in shallow water in sand.
A. vancouverensis Oldroyd is the same species.
Acteon candens Rehder Rehder's Baby-bubble
North Carolina to southeast Florida and Cuba.