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 



Plate i6e 



Monterey to San Diego, California. 



^/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 



Plate 15b 



Arctic Seas to New Haven, Connecticut. Alaska. 



% 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, 



