J 6 ART. 1.— CHARLES ELIOT : 



colour is of various dark shades (no doubt originally blue) on the 

 dorsal surface. The pedal surface is either silvery white or bears 

 a more or less interrupted streak of this colour on a dark ground. 

 The cerata are set in two groups on either side, about 16 in the 

 anterior and 14 in the posterior group. If there were originally 

 smaller groups further behind, they have been pulled up into the 

 second group by contraction. The tail is rather long. The oral 

 tentacles and rhinophores are small but distinct. In most speci- 

 mens the verge is exserted and very large. It is coiled in a 

 corkscrew shape but if straightened out would be 15-20 mm. 

 long. In two specimens it bears a very distinct chitinous hook 

 or spine, much more curved in the one than in the other. In 

 the remaing specimens no such armature can be found and it 

 is probable that it has been rubbed off. This suggests that 

 it is very unsafe to make the presence or absence of such 

 a spine in preserved specimens a generic" or even specific 

 character. 



The jaws are as in G. atlanticus with a single row of point- 

 ed denticles. The radula consists of rather more than 20 teeth 

 (21, 22 and 24 in the specimens examined), which generally bear 



4 (more rarely 3, 5 or 6) rather irregularly shaped denticles on 

 either side of a central cusp. 



In colour and dentition these specimens agree with the 

 descriptions and figures of G. lineatus recorded from the Southern 

 Pacific but it may be doubted if this species is more than a 

 variety of G. atlanticus. 



JElysia japonica sp. nov. 



18 specimens. Locality? (No label found). The largest is 

 about 20 mm. long and the wings are moderately ample. In two 

 specimens which were dissected, the radula was found to contain 



5 teeth in the ascending row, 15 in the descending and about 20 

 more of various sizes lying in a heap. The structure of the 

 radula and shape of the teeth is as usual in the genus. No 



1) As is done by Bergh in defining the genera Glaucus and lilaucilla. 



