182 24 



Nudibranchiata. 



N. holohepatica. 



Dorididae. 



Dorididae cryptobrancliiatae. 



Thordisa, Bgh. 



T/iordisa maculig er a Bgh. 



Th. maculigera, R. Bergh. Malacolog. Unters. Heft. XII. 1877. p. 540-542. Taf. LX1, Fig. 19-24; Taf. LXII, 



Fig. 1—2. 

 Doris villosa, Alder and Haxc. Notice of a coll. of nudibr. moll. Trans, zool. soc. of London. V, 3. 1864. 



p. 119, PI. XXXIII, Fig. 1. 



PI. II, Figs. IS— 21. 



One specimen of this form was taken on Febr. 9 th 1900 two miles south of Koh 

 Tulu, at a depth of 10 fathoms, on a bottom of mud mixed with sand. 



This specimen had in spirit kept a length of 22 mm by a breadth of 15 mm , and a 

 height of 5 mm ; the height of the retracted rhinophores was 2 mm , that of the retracted gill 

 2-5 mm ; the breadth of the mantle brim was mostly 5 mm , that of the foot 3-5 mm , the greater 

 part of which belonged to the foot brim ; the length of the tail was 2 - 5 mm . The consi- 

 stency was not hard, a little stiff. — The ground colour of the animal was yellowish. On 

 the back were found numerous scattered brownish gray dots, often forming small groups, 

 especially on the back proper; on the mantle brim larger gray spots were seen most of 

 which were furnished wilh the mentioned dots; the club of the rhinophores was brownish 

 red, the gill leaves brownish gray on the outside, yellowish on the inside. The lower side 

 of the mantle brim showed scattered, quite small and small, black dots, and so did also 

 the foot brim ; beside the edge of the mantle several larger spots formed by the confluence 

 of smaller ones, were found. — Above the liver shone through with a grayish colour. 



The animal was flattened to a rather high degree, the contour oval , the mantle 

 edge bent in a somewhat undulating manner. The back was everywhere covered with very 

 numerous small globular tufts, which were also seen at the roundish openings of the 

 rhinophores and the gill. The club of the rhinophores had about 30 leaves and a white 

 end papilla; the gill showed 6 tripinnate leaves, behind the gill the whitish, almost sub- 

 central truncate anal papilla. The lower side of the mantle brim was smooth. The short 

 tentacles, as it were, refolded at the top. The foot narrow, with a short tail. 



The central nervous system as usual, each of the cerebro-pleural ganglia 



