JAPANESE; NUDIBRANCHS. 15 



It is usually six but occasionally a side branch divides from the 

 main stem so low down as to constitute a separate plume. He 

 also says " Foot .... with an anterior transverse groove, the 

 upper lamina of which is deeply notched, a little enlarged, and 

 bearing one or two terminal papillae at each side of the notch." 

 I could not detect this peculiarity in the British Museum speci- 

 men, in which I merely observed that the two ends of the 

 divided upper lamina on either side of the notch are rather long 

 and pointed, so that they might possibly be described as papillae. 

 PL speciosa belongs to the same group of species as PL 

 formosa (A. & H.) PL inframaculata (Abr.) and PL ellioti (A. & H.) 

 which are distinguished by a rather conspicuous mottled colora- 

 tion, especially on the lower side. So far as is known, none of 

 them have denticulate teeth. It is possible that PL formosa is a 

 lighter variety of PL speciosa, having orange spots on a white 

 ground instead of black spots on a yellow ground. If the two 

 forms are regarded as mere varieties the name formosa (1864) 

 has priority. 



Platydoris tabulata Abraham. 



P. S. Abraham, Re-vision of the Anthobranchiate Nudibr. Mollusca, Proc. Zool. Soc. 1877, 

 p. 248. Eliot, Nudibranchs of Percy Sladen Trust Exped., T. Linn. Soc. xüi, 2, 1910, 



pp. 427-8. 



(Plate I., fig. 5). 



Nine specimens from Misaki. The dimensions of the largest 

 (to which the present notes refer, though they have been confirm- 

 ed by an examination of others) are : length 64 mm, breadth 

 35.5. Foot small. Mantle-margin very ample. The whole animal 

 is very flat and hard, and the back is covered with numerous 

 minute papillae. The ground-colour of both the upper and lower 

 surface is yellowish white, diversified on the back by darker 

 areas of yellowish green. Much of the dorsal area is also covered 

 with fine purple dots, but there are considerable bare spaces in 

 the middle and elsewhere. The absence of dots on them may, 

 however, be due to abrasion. On the underside of the mantle is 

 a band of purple dots round the foot. The rhinophores are dark 



