1906.] OF SOUTHERX INDIA AXD CEYLON. G69 



monstrosity, and can bear the name Thimna, as suggested by 

 Bergh. 



About thirteen species of Nemhrotka are fairly well charac- 

 terised. The dentition of N. ruhro-ocellata B. (Siboga, pp. 201-2) 

 is unknown, and it does not seem to me that the animal is 

 sufficiently distinguished externally from other forms such as 

 i\^. ruhropapulosa : — 



f 1. i\^. nigerrima B. 



j 2. N. cristata B. 

 J (See Eliot, Proc. Zool. Soc. 1904, ii. p. 90, 



I and Bergh, Siboga, 1905, p. 195.) 



{ 3. iV. kubaryana B. 



'^ 4. iV. c<x.rulea Ehot. 



5. N. lineolata B. 



J 6. iV. amitina B. 



\ 7. J\^. morosa B. 



r 8. iV^. diaphana B. 



' 9. N'. gratiosa B. 



j 10. ^\ affinis Eliot. 



(_ 1 1 . N. verconis Hedley & Basedow. 



(Trans. Roy, Soc. S. Austr. 1905, vol. xxix. p 158.) 



r 12, JSF. g7-acilis B. 



\ 13. N. ruhropapulosa B, 



The brackets merely mean that the species are allied, and do 

 not necessarily imply probable identity. It is possible, however, 

 that some of the species are only colour varieties. Nos. 1 to 4 

 are dark, with a comparatively wide radula containing about 

 12 teeth on each side of the rhachis. N. lineolata is yellowish 

 with fine brown lines and 8 teeth on either side of the rhachis. 

 In the remaining species the radula is narrow and there are only 

 3 or 4 teeth on either side. Xos. 6 and 7 are dark ; nos. 8 and 9 

 present a brilliant combination of colours in which bright yellow 

 and dark blue are prominent. N. gracilis and N. ruhropapulosa 

 both have a tricuspid rhachidian tooth and a similar coloration of 

 black and red. 



Teeveltana ceylonica Kelaart. 



(Kelaart, Ann. & Mag. Nat. Hist. April 1858, vol. i. no. 4, 

 p. 257, and pi, x. B. Eliot, Proc. Zool. Soc. 1904, ii. 

 pp. 86-7. 



Cf. Trev. ruhromaculata Bergh, Siboga, pp. 189-191.) 



There can be but little doubt that Bergh's T. ruhromaculata is 

 the same as the earlier T. ceylonica, for the agreement in characters, 

 both external and internal, is almost complete. The radula in 

 Bergh's specimen seems to have been somewhat larger than in 

 mine (from East Africa), though it is not quite clear whether 

 there were 16 or 32 teeth on each side of the rhachis. 



The species can be recognised externally by the colour and by 



