40 NOTES ON A COLLECTION OF CALIFORNIAN NUDIBRANCHS. 



Doridopsis. 



This large genus has much the same distribution as Chromodoris, and like 

 it, is specially characteristic of the tropical Indo-Pacific. It is found in the 

 Mediterranean, and is recorded from various parts of the Atlantic, extending 

 as far north as the Bay of Biscay. In the more Northern Pacific it is re- 

 corded from Ningpo and Yokohama, on the Asiatic side, and from Califor- 

 nia, as far north as Monterey, on the American side The only known 

 Californian form besides those described below is D. fulca, MacFarland. 



Bergh's list in the System includes 60 species, but D. vidua and D. 

 spiculatd are omitted from it, and no. 40 D. lacera (Cuv.) = D. ivellington- 

 ensis, Abr., should be removed, for D. larera is almost certainly a Hexalwan- 

 chm, and D. wellingtonemi^ is an Archidaris (see Eliot, Proc. Mai. Soc, 1905, 

 p. 236.). Few new forms have been described of late years, and it would 

 appear that the list can be brought up to date as follows : — 



60. D. vidua, Bergh. 



61. D. spieulata, Bergh. 



62. D. fulva, MacFarland. 



63. D. punrtatella, Bergh. 



64. D. reticulata, n. sp. 



Doris radiata, van Hasselt, of which there is a beautiful figure in Bergh's 

 notes from the Leyden Museum, is probably a Doridojysis. 



The species of Doridopsis are very difficult to diagnose and distinguish, 

 as the colours are remarkably variable, and the internal organs offer few im- 

 portant differences. There is no radula or other buccal armature. 



Doridopsis vidua (?), Bergh. 

 Bergh: Neue Nacktschnecken, iv, Journ. des Mus. Godeffroy, 1878, 



Heft, xiv, I p. 35—6. 

 A single specimen from La JoUa, July 1901, described by Cockerell as 

 Doris nigromaculafa, n. sp., without further notes. It is 10 millim. long, 

 5 millim. high, and 4 millim. broad across the branchiae, but is broader be- 

 hind than in front. The back is strongly arched, but this shape is perhaps 

 not natural as the animal is bent. The surface is smooth, not tuberculate, 

 and a number of glistening white spicules can be seen imbedded in the skin. 

 They are mostly fairly straight long rods, but some of the smaller 

 ones are bent and have an irregular outline. The colour of the animal, as 

 preserved, is a yellowish-drab with a slight inclination to lilac in places. 

 There is a double border of black spots round the dorsal margin, and a few 

 larger black blotches symmetrically disposed, one in front of the rhinophores, 

 two behind them, two in the middle of the back, and five in front of the 

 branchiae. The rhinophores are large and grayish. The branchial pocket 

 lies far back ; it is wide, ojjcn, very shallow, with a transparent floor, and 

 smooth, slightly raised margin. It contains six small scanty greyish plumes, 

 fully everted and set in a semicircle open behind. The anal papilla is large. 



