1900.] OF souxnEUN i^dia and ceylon. 675 



some of the older species ara very imperfectly known. Bergh 

 recognises eight species altogether, and in the commonest, 

 iSo. pel^ic/ica, four varieties besides the typical form. Basedow 

 &■ tledley (Trans. Roy. Soc. South Australia, vol. xxix. 1905, 

 pp. 148-9, pi. ix. figs. 1 & 2) have i-ecently figured some forms of 

 very divergent appearance which they refer to this species. 

 According to the structure of the radula the species fall into two 

 groups. In tSc. pelagica the teeth are flat and bear only a few 

 denticles : Sc. viarmorata belongs to this group. In Sc. elegantida 

 and *S'c. bicolor the teeth are erect and bear more numerous (10- 

 15) denticles. 



Alder and Hancock {I. c.) desci-ibed two species : Sc. viridis 

 and Sg. viarmorata. No specimen of the former is forthcoming, 

 but the animal should be recognisable by its shape if found again. 

 Notes on the specimens of Sc. inarmorata are appended. 



On Kelaart's drawing of the animal which he has called 

 Scylli^a (?) draccena, Hancock has written : — " Not a Scyllma ; 

 belongs to the Bullidae." The drawing suggests tha,t it is a 

 mutilated Lohiger with only three wings. But no shell is visible. 



ScYLL^A MAEMORATA A. & H. 



(A. & H. 1. c. p. 136.) 



Two specimens from Newcastle, preserved in alcohol. They are 

 high and narrow, about 15 mm. long and 3 mm. broad. One has 

 been dissected already, and two large globular masses of the 

 hermaphrodite gland are very conspicuous. 



So far as can be now seen, the external characters are as de- 

 scribed by Alder and Hancock. The most remarkable features are 

 the row of very distinct yellow tubercles on each side of the body, 

 and the large size of the whitish branchiae which are set inside the 

 cei'ata and on the ca.udal crest. The largest tufts are 3 mm. wide 

 and the branches 2'5 long. 



The jaws are greyish, of the shape usual in the genus, with 

 edges which are iireguLir in places, but not denticulate. The 

 surface is covered with fine striations and with numerous very 

 short rods, which look like minute spicules. In parts near the 

 edge is developed a fine mosaic. On the labial cuticle are two 

 grey triangular patches with a colourless triangle between them. 

 They appear to be of the same substance as the jaws and exhibit 

 the same short rods. This formation is perhaps analogous to the 

 labial armature in Bornella. 



The ludula is, as usual, somewhat fragile and decayed, but con- 

 sisted of at least 16 rows when complete, with at least 27 teeth 

 in the longest rows. The teeth do not diiFer materially from 

 those of Scyllcsa pelagica. The central tooth has a strong, flat, 

 elongate, rectangular base, but is not very broad. It bears 

 four denticles on either side of the central cusp. The first laterals 

 are similar to it, but narrower. The rest become gradually 

 broader and bear as many as six longish denticles on either side. 



