NOTES ON A COLLECTION OF CALIFORNLVN NUDIBRANCHS. 37 



Chporaodopis ealifopniensis, Bergh. 

 = Ckr, imiversitatis, Cockerell. 



Hergh : Exploration of Alaska : Nudibranchiata parti, 1879, p. 112; 

 id. Bull, of Mus. of Comp. Zool. Harvard, 1894, vol. xxv. no. 10; 

 Cockerell : Nautilus, June 1902, p. 19. 



One specimen marked by Mr. Cockerell "one of the type lot," caijtured 

 at San Pedro, California, August 1901. It is unfortunately very much 

 wrinkled and contorted, so that little trace of its former appearance remains. 



Lengtli 28.5 niillim. ; height r5.5 ; breadth 12; length of tail 11 inillim. 

 The colour is a dirty bluish-grey, which shows traces of yellow here and there, 

 though no spots can be distinguished. The mantle has disappeared entirely 

 at the sides, but it is ample behind, where it bears on its lower surface seven 

 large brown globes, 2.5 millim. in diameter. They are hollow and filled with 

 a mass of yellowish granules, which is not attached to the walls, but lies free, 

 like the contents of a stomach. The mantle is not ample over the head, the 

 tentacles are fairly large, partially retracted, with pits at the tips. The edge 

 of the rhinophore pockets are raised, but not those of the branchial orifice, 

 which is small, with a flat thickened rim. The branchiae are entirely re- 

 tracted and set in a circle open behind. One plume is trifid, one quadrifid 

 and the rest simply pinnate. The foot is grooved in front but not notched. 



The internal organs and membranes are greenish, much hardened, but 

 apparently as usual in the genus. The liver is large ; the labial armature 

 consists of two olive coloured plates, composed of mace-shaped elements, set 

 so as to form a tessellated pattern. The radula consists of 106 rows, con- 

 taining more than 100 teeth on each side of the naked rhachis. The first 

 ten rows or so are deep brown, the rest yellowish. The teeth are bifid, with 

 about 8 denticles on or below the lower prong. The upper prong is not 

 denticulate. The inner teeth are smaller, lower, and bear fewer denticles. 

 The outermost are also lower and rather irregular. 



If this is the type of Ghr. universitatis, Cockerell, there would appear to 

 be no sufficient ground for separating that species from Ghr. raliforniensis, 

 Bergh, which is recorded from the Santa Barbara Islands, Monterey and San 

 Diego. The buccal parts of the two agree, and both have conspicuous 

 spherical projections on the under side of the posterior mantle. The color- 

 ation also is similar. Ghr. universitatis is described by Cockerell as "dark 

 rich ultramarine blue ; the edge of the mantle and foot bright cobalt blue ; 

 mantle with two longitudinal series of oblong very bright orange spots, about 

 7 in a series ; five round orange spots on the anterior part of the mantle in 

 front of the rhinophores." Dall described the living Ghr. californiensis as 

 " mazarin blue with golden spots," and according to Bergh the preserved 

 specimen was "greenish blue. On the back were several yellowish-white 

 round spots. On the anterior part, they were chiefly in the median line, on 

 the rest, in two longitudinal series ... a briL'hler fine line seemed to border 



