250 JOURNAL OK CONCHOLOGY, VOL. II, NO. 8, OCTOBER, I905. 



distinct, but when there are more than four the lower are small. The 

 outermost teeth are lower than the rest, and squarish, with three or 

 or four jags on the top. The innermost have on the inside one 

 distinct denticle and two or three smaller ones. P>om the top they 

 appear trifid. 



To judge from its coloration this animal is Chromodoris pusilla, 

 which is only known by a drawing made by Graeffe, and published by 

 Bergh. It was apparently found in the Islands of the South Pacific. 



The form is closely allied to Chr. lineata, Chr. hilaris and other 

 striped species, and is probably merely a variety, but may be retained 

 as a species, provisionally, since the coloration is very distinct. 



Chromodoris petechialis^ (Gould). 



Gould, "U.S. Exploring Exped.," 1838-42, vol. 12, p. 296, atlas, 

 figs. 391, 391a ; Eliot, " Nudibranchs from the Pacific," P/oc. Ma lac. 

 Soc, 1904, pp. 231-2. 



Three specimens. The locality is not stated, but they are with 

 others said to come from Karachi. The notes on the living animal 

 say " Pellucid substratum ; edge bright orange ; irregular spots deep 

 crimson." The branchiae are said to have been anemone-like and 

 colourless ; the rhinophores short and colourless. 



The specimens are of much the same size and colour. That from 

 which the following description is taken is about 11 mm. long, y5 

 mm. broad, and 4 '5 mm. high. The general colour is a reddish- 

 white, with a distinct light border, but no trace of the crimson spots, 

 which have no doubt become diffused. The animal is quite smooth 

 and soft, but not gelatinous. The foot is folded together, but appar- 

 ently would not be narrow if spread out. The anterior margin bears 

 a broadish shallow groove. The tentacles are retracted. The mantle 

 edge is ample, and overhangs the body all round. The branchite 

 are twelve, set in a semicircle, with a short spiral at the ends, simply 

 pinnate ; they are colourless, with white lines on the pinnje. The 

 rhinophores bear about twenty perfoliations, marked by white lines. 



The intestines are mostly of a deep reddish-purple, and the buccal 

 mass bears blotches of the same. The central nervous-system has a 

 strong reddish-yellow tinge which is deeper on the pedal ganglia than 

 on the cerebro-pleural. The labial armature is a complete ring, 

 purpHsh towards the outside and greenish-yellow towards the inside. 

 The elements are bent rods, with rather irregularly cleft ends. They 

 are shorter on the inside than on the outside. 



The radula is colourless and transparent, consisting of forty-five 

 rows, containing at most about sixty teeth on either side of the rhachis, 



I ll is possible that these specimens are the same as the animal described as Chr. histrio by 

 Bergh \\\ "The Danish E.\pedition to Siam," 1889-iyoo, p. 184, pi. ii., fig. 22, Init tlie name 

 petechialis has priority. 



