300 American Seashelh 



dilated, conical, perfoliate with 24 to 30 leaves on each side. Each of the 7 

 branchial plumes large, spreading and 3- to 4-pinnate. Radula with 33 rows; 

 center naked; with 42 to 49 strongly hooked, denticulate pleural teeth. Com- 

 mon in tide pools. 



Subgenus Anisodoris Bergh 1898 

 Archidoris 720 bills MacFarland Noble Pacific Doris 



Plate 1 6c 



California. 



4 inches in length. Rhinophore stalk stout, conical, the clavus perfoli- 

 ate, with about 24 leaves, and the stalk deeply retractile within low sheaths, 

 the margins of which are tuberculate. Each of the 6 branchial plumes large 

 and spreading, 3- to 4-pinnate. A thin, membrane-like expansion joins the 

 bases of the plumes. Radula with 26 rows; center naked; with 55 to 62 

 strongly hooked pleural teeth. Moderately common in tide pools. 



Genus Discodorts Bergh 1898 



Body rather soft, oval in outline; branchial aperture slightly crenulate, 

 stellate or bilabiate; anterior margin of the foot bilabiate, the upper lip more 

 or less notched. 



Discodoris heatbi MacFarland Heath's Doris 



Plate i6i 



California. 



I inch in length. Mantle thick, densely spiculate. Rhinophores cylindro- 

 conical, the stalk stout, the clavus with 10 to 15 leaves, and wholly retrac- 

 tile. Each of the 8 to 10 branchial plumes are tripinnate. Radula colorless, 

 with 20 rows of teeth; center naked. 36 to 42 strongly hooked pleural teeth. 

 Rather rare in rock pools in the summer. 



Genus Rostanga Bergh 1879 



Back covered with minute, spiculose or stiff papillae; branchiae of 

 simple-pinnate leaves. 



Rostanga pulchra MacFarland MacFarland's Pretty Doris 



Plate i6g 



California. 



% inch in length. Rhinophores short, stout, translucent-pink, stalk 

 stout, prolonged beyond the 20- to 24-leaved clavus as a blunt, cylindrical 

 process which is % the length of the entire rhinophore. 10 to 12 erect, sepa- 



