1906.] OF SOUTHERN INDIA AND CEYLON. 1005 



teeth are erect, strong, but not very stout. The last one or two 

 are reduced in size, but not degraded and still hamate. The 

 middle part of the radula is more spaced than the rest, and 4-5 

 inner teeth on each side, which are lower than the others, seem to 

 be set in the broad rhachis. But it is not clear if this position 

 is natiu'al. 



Though this radula is narrow, it is doubtful if the animal 

 described by me (Gardiner, Fauna and Geography of the Maldive 

 and Laccadive Archipelagoes, vol. ii. part 1, p. 554) as Disc, 

 pardalis var. is really referable to this species. It had a radula 

 of only 13.0.13. 



Doris concinna A. & H. 



= DisGodoris concinna (A. & H.) and 

 Disc. Goncinniformis Bgh. 



Labial armature composed of two triangular plates, consisting 

 of a dense mass of irregular and sinuous rods. 



The radula consists of 1 7 complete rows and fragments of 3 or 4 

 others, with 45 teeth on either side of the rhachis in the longest 

 rows. The innermost teeth are markedly lower than the rest and 

 project into the wide rhachis ; the oiitermost are smaller but not 

 degraded. 



This radula is not inconsistent with the suj)position that D. con- 

 cinna is Bergh's D. coiicinniformis . The foi'mulse of the radul^e 

 examined by him are 27x44.0.44; 24x37.0.37; 31x55.0.55. 

 Some (but apparently not all) of his specimens had thickenings 

 on the rhachis, which are not visible in Alder and Hancock's 

 preparations. 



Doris osseosa Kelaart. 



"i =Sclerodoris osseosa Eliot, P. Z. S. 1903, vol. ii. p. 380; 

 renamed Peronodoris, as this apparently identical genus has 

 priority. 

 Two radulse are preserved. They are yellow or brown, and 

 consist of 21 and 26 rows of teeth respectively. On either side of 

 the rhachis are from 35 to 50 teeth. The 5-6 innermost, particu- 

 larly the one nearest to the rhachis, are short and slender. The 

 rest are hamate, except the two outermost which are degraded. 

 The 5-6 outermost decrease in size. 



Since both these radulse are unusually short, some doubt arises 

 whether D. osseosa is really the same as the animal described by 

 me I. c. The specimen preserved, though in bad condition, is 

 apparently the sa.me as mine, and, being smaller, may possibly 

 have a shorter radula. 



Doris rusticata A. k H. 1. c. p. 120. 

 — Stau7'odoris rusticata (A. & H.). 

 One radula light yellow in colour, consisting of 38 rows with 

 remains of a 39th. There are about 50 teeth on each side of the 



