JAPANESE NUDIBRANCHS. 11 



animal described by Bergh as Aporodoris ? rubra. This identity 

 is hardly deducible from the description, in which Bergh has 

 omitted to mention the peculiar low reticulation and depressions. 

 They were however clearly visible in his specimen when I exa- 

 mined it, and it has the same red tint as the present Japanese 

 specimen. This tint is apparently due to the intestines and is 

 not shown in the figure of the living animal. The pectinate 

 teeth and the hooked cones in the vas deferens are further points 

 of agreement. 



In view of the reticulation on the back T. do not think either 

 specimen should be referred to von Jhering's somewhat doubtful 

 genus Aporodoris, of which the type is Alder and Hancock's Doris 

 millegrana. They seem to me to be referable rather to Halgerda, 

 from which they differ only in the cones on the vas deferens. 

 But the name H. rubra is pre-occupied by another species created 

 by Bergh (Siboga Exp. p. 126) and I therefore propose to call 

 the present species H. jja^onica. 



Halgerda graphica Basedow and Hedley. 



See : Trans. Roy. Soc. South Australia, vol. 29. 1905, pp. 152-3. For IL formosa see Bergh 

 in Verh. cl. k. k. zool. botan. Ges. in "Wien, xxx, |18S0, pp. 190-195 and in Mal. Unters. 

 1888, Heft x^vi, i. pp. 822-S26. 



Two specimens labelled Okinawa Islands and Otaba. The 

 larger is about 55 mm. long and 35 broad. The smaller is about 

 half this size, but both specimens are somewhat bent and were 

 probably considerably larger when alive and fully extended. The 

 integuments of the smaller specimen resemble a semitransparent 

 stiff jelly, blue in the lower parts but more or less distinctly yellow 

 on the ridges and tubercles. 



The back bears a median ridge from which run side ridges 

 at various angles, forming figures of different shapes but mostly 

 quadrilateral, although those nearest to the mantle margin are 

 incomplete. The ends and the junctions of these ridges are 

 marked by tubercles of a considerable size. The space within 

 the figures is marked with bold black lines and spots, and there 



