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ONCHIDORIDAE 305
2 to 3 inches in length. With 8 to 12 tuberculate processes in front of
head, and 6 to 7 more down the sides of the back. Back yellowish-brown,
often flecked with bluish spots. Tips of yellow processes, tip of tail and tips
of branchial plumes with yellowish red. Rhinophores set in conspicuous
sheaths, club yellow with 20 leaves. Branchial plumes 5, bushy, tri- and
quadri-pinnate. 18 rows of radular teeth; 4 centrals, 8 pleurals and 8 uncinal
teeth. Found on brown kelp. Fairly common.
Genus Polycera Cuvier 1817
Frontal margin with finger-like processes. Finger-like processes border-
ing branchial plumes. Center of radula naked, flanked by 2 lateral teeth and
several uncini.
Polycera atra MacFarland Orange-spiked Doris
Monterey to San Diego, California.
Plate i6e
^/4 to I inch in length. The blue-black lines shown in our figure are
usually thinner and less conspicuous. 8 gill plumes. Common on brown
algae. 9 to 10 rows of radular teeth, dark-amber; 2 pleurals, 3 to 4 uncinal
teeth.
Family ONCHIDORIDAE
Genus Acanthodoris Gray 1850
Body Dorid-like with a furry back. Labial disk armed with minute
hooks. Center of radula naked; first pleural tooth large, external pleurals 4
to 8, small. Glans penis armed. Vagina very long.
Acanthodoris pilosa Abildgard Pilose Doris
Arctic Seas to New Haven, Connecticut. Alaska.
Plate 15b
% to 1% inches in length. Semi-transparent. Color variable, ranging
from pure white to yellowish white, canary-yellow, yellowish brown, gray-
speckled, purple-brown and black. Back covered with soft, slender, conical,
pointed papillae, which give it a hairy appearance. Rhinophores long, its
club bent backwards and with 19 to 20 leaves. Sheath denticulate. Branchial
plumes 7 to 9, large and spreading, tripinnate, transparent. A number of
color forms have been described from Alaska by Bergh and from New Eng-
land by A. E. Verrill. Radula with about 27 rows. No central tooth, 4
pleurals on each side. Moderately common at low tide, sometimes found
out of water,