OPISTHOBEANCHIATE MOLLUSCA. 345 



2 inches. It was taken in fairly deep water off Jervis Bay, Tasmania. The 

 description, though not perfectly in agreement with the Ceylon specimen, yet is 

 sufficiently near to make the identification most probable. 



Dons aunta, GOULD (2, p. 299, fig. 394), is similarly coloured, but has 8 branchiae. 



The same type of coloration is also found in a Tectibranch, Pleurobranchus punctatus 

 and it would be interesting to discover whether these similar markings, occurring in 

 different groups, were associated with a similar habitat, or were merely fortuitous. 



FAMILY: PHYLLIDIIDyE. 

 Phyllidia varicosa, LMK. 



There is a single specimen of the above, taken on Muttuvaratu Paar. The colour 

 of the spirit specimen is as follows : Mantle of a deep bluish-black ; tubercles with 

 a halo of faint bluish-white ; their tips with a purplish tinge. The tubercles are 

 roughly of two sizes, large and small ; there is a line of tubercles down the centre of the 

 mantle, each large tubercle alternating with two small ones, the edges of their halos 

 just touching. There are 2 ill-defined rows of more distinct large tubercles on either 

 side, the smaller tubercles being scattered irregularly around them. The margin is 

 occupied with very small crowded tubercles arranged irregularly 2 to 3 deep. 



The underside of both mantle and foot is a dark greyish-black. There is no median 

 black line on the sole of the foot. 



This species is widely distributed throughout the Indian Ocean and has, according 

 to BERGH, been recorded from Ceylon by KELAART (3) under the name of Phyllidia 

 ceylanica. 



Professor HERDMAN'S notes contain references to the capture of another Phyllidia, 

 probably this species, at Periya Paar. It is described as being of a " rich dark green 

 colour with prominent bright yellow papillae ; edge of mantle yellow all round ; foot 

 dark green." 



Phyllidia nobilis, BGH. (?). Plate III., figs. 16 and 17. 



There is in the collection a small specimen of Phyllidia or Phyllidiella, taken off 

 Talaivillu in April, 1902. I have been unable to distinguish satisfactorily between 

 these two genera, and have been compelled to adopt Sir C. ELIOT'S view (12) that 

 the distinction cannot be maintained. 



The length of the spirit specimen is 2 '5 centims., width 1'25 centims., width of foot 

 07 centim. The tentacles are short, pointed, placed close together at base, divergent, 

 laterally grooved. The lateral branchial lamellae are about 60 in number, triangular. 

 The margin of the mantle is white, moderately narrow, bearing very small tubercles. 

 Inside this is a very narrow black line bearing a few tubercles, entire in front, 

 slightly broken behind. The centre of the mantle is of a bluish-white colour bearing 

 white knobbed tubercles and marked by 3 black bands which take the form of 

 a three-pronged fork directed backwards. The outer branches of the fork are parallel 



2 Y 



