MacFarland Preliminaicy Account of Dorididse. 41 



tooth ; the hook at first strongly curved and thick but increasing in length, 

 becoming less curved from the 12th tooth outwards, the base decreasing in 

 bulk, passing over rapidly into very long slightly curved slender elements 

 arising from small compressed bases and bearing from 1 to 6 very long 

 denticles upon the inner margin in the distal third of the tooth, these 

 denticles reaching nearly to tip of tooth and giving it the appearance of 

 being divided ; outer teeth of whole radula very flexible and slender, pre 

 senting a brush-like appearance. 



Glans penis unarmed, the vas deferens short, the prostate gland large 

 thin-walled ; spermatotheca spherical, very large, making up nearly two- 

 thirds the bulk of the anterior genital mass. 



Abundant everywhere along the coast in the rocky tide-pools from Mon 

 terey to Point Lobos upon a red silicious sponge which incrusts the under 

 side of overhanging rocks and with which it is nearly identical in color. 



5. Diaulula sandiegensis (Cooper). 



Don's (Actinocydus?} S'tndiegensw Cooper. New Species of Californian 



Mollusca. Proc. Calif. Acad. Sci., II, 1862, 204. 

 Doris Sandiegmsis Cooper. New or Rare Mollusca Inhabiting the Coast of 



California, No. II, Proc Calif. Acad. Sci., II r, 1868, 58. 

 Diaulula Sundiegensis (Cooper). Bergh, The Nudibranchiate Gasteropod 



Mollusca of the North Pacific Ocean, with Special Reference to those 



of Alaska, II, Proc. Acad. Nat. Sci. Phila., 1880, 41. 



Body soft, elliptical, velvety, the ends equally rounded, somewhat de 

 pressed ; mantle extending well beyond ^P> to 8 mm.) the foot everywhere 

 except at tip of tail ; mantle edge wide and thick, slightly crenulate ; dor- 

 sum everywhere minutely villous and velvety, pale yellowish in color with 

 dark brown or black rings of varying size, number and position. In gen 

 eral these are arranged in 2 longitudinal series on each side of the median 

 line with from 3 to 6 rings in each row but this is subject to much variation. 

 Small patches of brown may also occur among the rings. The general 

 color of the dorsum may vary from a light yellow to deep brownish yellow 

 or even chocolate. 



Oral tentacles long, slender, finger-like ; anterior end of foot deeply bi 

 labiate, the upper thinner lip with a median notch ; rhinophores conical, 

 the clavus dilated, perfoliate with 20 to 30 leaves, deeply retractile into 

 sheaths with crenulate margin ; branchial plumes 6, tripinnate, retractile 

 into sheath with prominent crenulate margin ; no labial armature save a 

 simple cuticula ; radula rather broad, twice as long as wide, yellowish, the 

 teeth in 19 to 22 rows, with 26 to 30 teeth in each half row ; rhachis broad, 

 naked; pleural teeth similar in shape, strongly hooked, compressed, a 

 narrow wing-like expansion upon the inner side of each tooth. Glans 

 penis unarmed ; prostate gland large. 



Found in fucoid zone among rocks all along the southern coast of 



