646 SIR c. ELIOT ON NUDiBEANCHS [June 19, 



to examine the specimen from Ceylon described by Farran as 

 Platydoris ? spinulosa, but doubt if it is referable to this genus. 



Platydoris FORMOSA (A. & H.). (Plate XLYII. fig. 3.) 

 {Doris formosa A. k H. 1, c. p. 116. 

 Eliot, Proc. Zool. Soc. 1903, ii. p. 376.) 



Two specimens * are preserved, one about 60, the other about 

 40 mm. long. They agree with Alder and Hancock's description 

 and plate. 



The back is smooth, and the minute granulations are visible 

 only with difficulty even under a lens. But scattered over the 

 larger specimen quite irregularly are a number of hard white 

 tubercles which look like parasitic growths or accretions. They 

 are not detachable, and there are none on the smaller specimens. 

 The lobes of the branchial and rhinophorial pockets are very 

 distinct. The foot is grooved and deeply notched in front. The 

 oral tentacles are rather large, and so distinctly grooved on the 

 outer side as to be almost ear-shaped. 



The tissues of the radula have decayed, but the teeth are well 

 preserved. They are hamate, with moderately stout bases and 

 rather slender elegant shafts which often have a distinct ridge or 

 wing at the side. They differ considerably in size and somewhat 

 in shape, some being more strongly hooked than others, but it is 

 not now possible to assign them to theii^ respective places in the 

 radula. Alder and Hancock say they decrease in size towards 

 the centre. It is noticeable that no denticulate or degraded teeth 

 are to be found, so that the hamate form is probably retained to 

 the extreme end of the rows and does not degenerate, as so often 

 happens in Platydoris. 



The genitalia are much hardened, but it is still plain that the 

 large efferent ducts of both branches are extremely strong and 

 muscular. One tube (probably the vas deferens) is thickly set 

 with large round granulated scales, bearing short strong spines 

 (PI. XLYII. fig. 3). The other tube (probably the female branch) 

 is lined with very conspicuous folds and lumps. 



This handsome species appears to be characterised by its 

 coloration, its distinctly grooved tentacles, and the armature of 

 the genitalia, particularly the granulated appearance of the discs. 



The East African form referred by me (Z. c.) to this species with 

 a query does not agree with the type specimen, and is more likely 

 to be PI. sanguinea Bergh (Siboga, p. 139). 



Platydoris scabra (Cuv.). 

 '■= Doris coelestis Kelaart. 



(Quoy & Gaimard, Voyage de I'Astrolabe, Zoologie, tome ii, 

 p. 258. Eliot, Proc. Zool. Soc. 1903, ii. p. 375. Kelaart, 

 I.e. I. p. 293.) 

 The Doris coelestis of Kelaart seems to be clearly the older 



* These and all the specimens described by A. & H. in Trans. Zool. Soc. 1864 are 

 carefully labelled by Hancock, so that there is no doubt of their identity. 



