660 SIR c. ELIOT ON NUDiBRANCHS [June 19, 



species. The comparatively short radula and small inner teeth 

 are also characters of Trifpa, and the denticulation, though rare 

 in the genus, is found in Trippa monsoni. 



Specifically, I think the form may be identified with Kelaart's 

 Doris hoteola. His drawing is not very good and his description 

 slight, though not inaccurate. Mr. Farran's type specimen of 

 Thordisa cmcdata was found in Ceylon, and the remarkable 

 coloration, supported by this identity of habitat, seems a sufiicient 

 reason for regarding the forms as the same. 



Trippa spongiosa (Kelaart). (Plate XLIY, fig. 2.) 



(Kelaart, 1. c. I. p. 302. Cf. Boris areolata, A. & H. 1. c. 

 p. 119. Phlegmodoris mephitica Bergh in Semper's Reisen, 

 Heft xiii. p. 594.) 



Kelaart's figure and description seem sufficient to identify this 

 species with Phlegmodoris mephitica B. The coloration, con- 

 sistency, rhinophore-sheaths, and branchise are all points of 

 agreement. Kelaart was apparently unable to find the oral 

 tentacles, which is not inconsistent with Bergh's account of them 

 as folds on either side of the mouth. 



Andr6 (" Mollusques d'Amboine," in Revue Suisse de Zoologie, 

 tome iv. 1896, p. 401) suggests that' I', spongiosa is the same as 

 Trippa (Boris) areolata A. & H. He apparently had before him 

 specimens from Amboina, but unfortunately gives no description. 

 The identity is not improbable, for the only certain distinction 

 between the forms is that there are several black pits in the 

 dorsal surface of T. areolata, whereas in T. spoiigiosa the black 

 pigment is wanting, though the back is said to be " deeply pitted." 

 But without a further comparison of specimens it is impossible 

 to decide whether the two forms are colour varieties or distinct 

 species. 



For some account of T. areolata, see my paper on " JSTudibranchs 

 from East Africa and Zanzibar," in Proc. Zool. Soc. 1903, ii. p. 369. 



Trippa monsoni Eliot. (Plate XLY. fig. 1.) 



(Eliot, Proc. Zool. Soc. 1903, ii. p. 371. Cf. Kelaart, Boris 

 leoparda, 1. c. I. p. 294.) 



These two forms are probably identical. They agree in size 

 and in a somewhat remarkable coloration, composed of greyish or 

 purplish spots separated by white reticulations. The rhinophores 

 and branchise are yellowish or greenish. Kelaart, however, does 

 not mention any pits such as are found on the back of T. monsoni. 



An examination of specimens from Ceylon would probably 

 decide the question of identity. If it is established, the animal 

 will be Trippa leoparda. 



DORIDOPSID^. 



The works of Bergh and Yayssiere contain much valuable in- 

 formation about this family, but Hancock, " On the Anatomy of 



