38 MacFarland — Preliminary Account of Dorididm. 



plumes 7, 3 or 4 pinnate, retractile within tuberculate sheath ; radula 

 colorless, broad and short, deeply grooved, the teeth in 33 rows ; rachis 

 narrow, naked ; pleurae multidentate with 42 to 49 strongly hooked com- 

 pressed teeth, each bearing a strong, wing-like expansion on the inner mar- 

 gin of the shaft. Glans penis unarmed, with no trace of a prostate gland 

 upon the long (28 to 30 mm.) vas deferens. 



This Californian species is clearly distinct from the European A. taher- 

 culata (Cuvier). 



Cooper (1862) described this species superficially from 2 specimens taken 

 in dredging at Monterey Bay, in 6 to 10 fathoms depth. Bergh (1878-79) 

 was able to add to this a description of the radula and body measurements 

 from 4 dried specimens from Alaska and assigned the species to his genus 

 Archidoris. Further than this nothing has been published upon this species. 

 It is quite abundant at Monterey upon the piles of the wharf at all times of 

 the year and in rocky tide pools. 



U. S. National Museum, No. 181,285. Monterey Bay, Calif. 



Montereina gen. nov. 



Body firm, dorsum tuberculate ; tentacles long, conical ; branchiae large, 

 tri-orquadripinnate in few divisions ; large prostate gland present; vagina 

 and glans penis unarmed. 



This new genus is proposed for the reception of the following type 

 species : 



2. Montereina nobilis sp. nov. 



Type from Monterey Bay, Calif No. 181,284, U. S. National Museum. 



Body very large, plump, arched, but little depressed ; broad, elongate 

 elliptical in outline, the ends nearly equally rounded ; general ground-color 

 a rich orange-yellow varying to light yellow in some specimens ; dorsum 

 thickly tuberculate, the tubercles slightly inflated at their distal ends; 

 dorsum mottled everywhere between the tubercles with irregular blotches of 

 dark brown or black, the total amount of dark coloration varying between 

 wide limits in different individuals. Branchial plumes pinkish, tipped 

 with white. 



Length up to 20 cm.; width to 6 cm.; height to 3 cm. 



Foot broad, smooth, light yellow, abruptly rounded in front, more grad- 

 ually so behind, its anterior margin bilabiate, the upper lip with a slight 

 median notch ; mouth relatively small, lips fleshy, the oral tentacles digiti- 

 form or bluntly conical, directed forward, the tips curved outward; rhi- 

 nophores stout, the stalk conical, the clavus perfoliate with about 24 leaves ; 

 the rhinophore sheath with tuberculate margin ; branchial plumes 6, large, 

 spreading, tri- and quadripinnate, covering the whole of the posterior dor- 

 sum. Radula broad and short, deeply grooved, colorless or nearly so, the 

 rachis very narrow, naked ; teeth in 26 rows of 55 to 62 teeth on each side ; 



