JAPANESE NUDIBBANCHS. 17 



rate size. The|["spermatotheca is round, brown, and full of 

 spermatozoa. The spermatocyst is elongate and stalked ; it rises 

 close to the j spermatotheca and is bent on itself, so as to appear 

 double, The prostate is large and globular. Attached to the 

 bag -which contains the penis is a pear-shaped flocculent gland 

 with a longish duct. The lower part of the vas deferens (and it 

 would appear the glans penis too) bears strong, jagged, pinkish 

 folds, which rise into bent spines of a pinkish colour set in six 

 rows. Higher up there are no spines, but only jagged colourless 

 folds. The vagina is lined with a thick red cuticle bearing folds 

 on which are knobs and prominences. Though the whole arma- 

 ture is very similar to that of the male branch, there are no 

 true spines in it. 



This form is nearly allied to Bergh's PI. variegata, which 

 also possesses the anomalous character of a labial armature. The 

 two may be varieties of a single species (in which case the name 

 tabulata of 1877 has priority over variegata of 1880), but there 

 are many differences of detail. The coloration of the dorsal surface 

 is not strikingly similar ; PL tabulata has no lines on the foot ; its 

 oral tentacles are large and grooved, whereas those of PI. variegata 

 are small and digitate. 



i » j 



Platydoris cruenta Q. and G. 



( = P. arrogans Bergh).— Q. & G. Voyage de l'Astrolabe, ii, 1832, p. 260, Bergh Mal. Unter- 

 such. Heft xii, p. 513 ff. and Supp. Heft i, p. 58 ff. 



Two specimens from Yaeyama Is. appear to belong to this 

 species, of which they possess all the internal and external 

 characters except the presence of scarlet blotches. It is known 

 that these blotches totally disappear in alcohol." As preserved 

 the specimens have a yellowish ground colour but the greater 

 part of the dorsal surface is thickly marked with fine lines, 

 which are of olive colour and impart the same colour to the 

 spaces between them. In many places the lines are so nume- 

 rous that they coalesce and form blotches, but there are also 



1) This has happened to all the specimens in my own collection. 



