380 SIR C. ELIOT ON NUDIBRANCHS [DeC. 1, 



of the radula of Asteronotus herirana S. R. plate Ixviii. fig. 9). 

 The male reproductive organs are armed with two rows of hook- 

 bearing disks, each disk set at some distance from the next one. 

 There appears to be an accessory gland on the female branch like 

 the glandula amatoria of Asteronotus, but no hasta was discover- 

 able. The centi'al nervous system is much concentrated ; above 

 it anteriorly and posteriorly lie the two very distinct divisions of 

 the blood-gland. 



This species seems in many ways intermediate between Platy- 

 doris and Asteronotus. But as it has the characteristic genital 

 armature of the foi-mer, and as one of the principal characters of 

 the latter is that the back is quite smooth and neither granulate 

 nor papillous, I have thought it better to refer my specimens to 

 Platydoris. 



The chief specific character is no doubt the branched dorsal 

 papillae. I think it pi'obable that this animal is identical with 

 the Doris sordida of Quoy & Gaimard from Mauritius, but as 

 neither their description * nor their plate shows the branched 

 papillce, identification is impossible. 



25. ScLERODORis ossEOSA (Kelaart). 



[See Kelaart, " On new Species of Ceylonese Mollusca," in 

 Annals & Mag. of l^at. Hist. vol. iii. 3rd ser. p. 298, 1859 ; and 

 Alder & Hancock, " Notes on a Collection of Nudibranchiate 

 Mollusca made in India," Tr. Z. S. iii. 1864, p. 121.] 



Three specimens from the neighbourhood of Wasin. The notes 

 on the living animals are unfortunately not forthcoming. 



The alcoholic specimens vary in colour from pale yellow to 

 greyish brown. They are hard and rough to the touch like Platy- 

 doris. The largest is 3*8 centimetres long, 2-2 broad, and 1*2 high. 

 In all the specimens there is an indistinct dorsal ridge, and the 

 back is irregularly reticulate and honeycombed ; but while these 

 markings extend over the entire upper surface in two specimens, 

 they are confined to patches in the thii'd. In all three there 

 is one pit, larger and more conspicuous than the others, and 

 surrounded by a protuberance in front of the gills. The mantle- 

 brim is wide, and extends about 5 mm. beyond the head and tail. 

 The ihinophore-openings are somewhat raised and closed by 

 valve-like crenulations. The rhinophores ai-e conical and not 

 much bent back ; the perfoliations cease before the tip. The 

 branchial pocket lies at the end of the doi'sal lidge and has raised 

 edges ; it is directed somewhat backwards and is crenulate. The 

 branchiae are six or seven, with the stem very lai-ge compared with 

 the scanty perfoliations, which are bi- and sometimes tripinnate. 

 The long and narrow foot is grooved and notched anteriorly. 

 The tentacles are small, white, and conical. There is a strong 

 bluish labial cuticle without any armature. The radula consists 

 of about 40 rows, containing about 45 simply hamate teeth on 



* Unless this feature is meant to be included under tLe observation " Cette espece 

 a un peu la forme d'une Onchidie.". 



