JAPANESE NUDIBEANCHS. 45 



which was 23 mm. in length, 9 mm. broad across the cerata and 4 

 mm. broad across the bare part of the back behind the rhinopho- 

 res. This bare portion extends backwards for abont 15 mm. 



The specimens are now of a dnll yellow colour but the cerata 

 are darker than the body and may have been bluish in life. The 

 sides of the body are semitransparent. The cerata are fusiform 

 and thickly set but are not arranged in definite groups or regular 

 lines. They are inserted simply on the surface of the back and 

 not on ridges. All the cerata, even the smallest, bear a distinct 

 crinkled membrane. The anal papilla is dorsal, about 12 mm. 

 behind the rhinophores and slightly to the right of the median 

 line, just where the cerata begin. The genital orifices are distinot 

 and double, situated as usual in the genus. The rhinophores are 

 not perfoliate : the corners of the foot are rounded. 



The jaws are large : the cutting edge is not smooth but 

 bears a series of distinct but very irregular and often bifid pro- 

 jections. The radula consists of a single row of 40-50 teeth. 

 The central cusp of each tooth is long and strong and near the 

 base broadens out into winglike lateral expansions. Beyond these 

 expansions the lower part of the tooth bears 5-9 denticles on 

 either side. In the anterior teeth both the central cusp and the 

 lateral denticles are much worn and broken. 



I can see no reason for separating this animal specifically 

 from Fiona marina ( = atlantica). It is probably the var. pacifica 

 described by Bergh I.e. but unfortunately he does not state clear- 

 ly what are the characters which distinguish this variety from 

 the atlantic form. The most important of them appears to be 

 the colour which, according to Dall, was " blue purple like Ian- 

 thina communis."' As indicated above, the present specimens though 

 now yellowish retain traces of a darker colour which may have 

 been bluish in life. 



Glanctis lineatus Reinhardt. 



(Bergh, Anatomiske Bidrng til Kundsbab om Aeolidieme, 1864, pp. 149-153 and plate viii). 



Several specimens labelled " Sagami Sea from the surface." 

 Average length about 20 mm. but often bent and twisted. The 



