JAPANESE NTTDIBRANCHS. 27 



■Ceratowma cornigerum Adams. 

 (Plate IL, fig. 6). 



Two specimens, one from Ago Bay and one from Misaki. 

 The latter is accompanied by a coloured drawing which shows 

 that it had the coloration of C. cornigerum, though as preserved 

 it has a pale waxy pink appearance. The radula has a formula 

 of about 80x230.0.230 and most of the teeth bear a single denticle 

 on the outside only. The innermost teeth have one denticle 

 outside, and one or two inside. The outermost teeth are low 

 and often bifid but not serrulated. The labial armature is a 

 greyish yellow ring of bent rods. The buccal mass is elongate 

 and a long tube leads from the mouth to the labial armature. 



The other specimen shows a curious malformation. The 

 margin of the foot is interrupted on the left side (probably as 

 the result of an accident) and has grown out into a horn about 

 10 mm. long. 



Chromodoris sibogae Bergh. 



Bergb, Siboga Expeditie, Opisthobranchiata, p. 157. 



(Plate II., fig. 7). 



Five specimens from Moroiso, Misaki, 14-16 mm. long. A 

 coloured drawing represents the living animal as pellucid with an 

 opaque white border round the mantle and also round the foot. 

 The pellucid flesh is faintly tinged with green near the margins, 

 with violet on the top of the tail and with pale brown in the 

 middle of the back. This last colour is doubtless due to the 

 intestines shining through. The rhinophores are tipped with 

 black and each of the branchiae bears two fine longitudinal lines 

 of the same colour. The preserved specimens are greyish but 

 the white borders and black lines are still distinct. 



The shape is high and somewhat rectangular. The branchiae 

 are 16. The labial armature is formed of bent rods, some of 

 which are bifid but most have the tips entire. The radula is 

 yellow and very transparent. It contains 150-170 rows, in each 



