90 ART. IT.^ — A. IZUKA : 



The first elytron is small, rounded and quite smooth. Elytra 

 rapidly increase in size posteriorly, and almost cover the dorsum 

 in the anterior parts of body. They are soft, whitish, slightly 

 translucent ; those in the anterior third of the body are quite 

 smooth on both surface and margin. Posterior to the anterior 

 third of body, the fold on the outer margin of elytron presents 

 a series of simple and very slightly tapering papillae, but 

 these are usually invisible to the naked eye. Minute examination 

 shows that the outer border in anterior elytra is very prettily 

 marked with regularly arranged areolae. 



The second parapodium (which carries the first elytra) puts on 

 the character of tlie posterior to a greater or less extent. The 

 dorsal ramus has a group of very long papillae (about five in 

 number). Only the bristles nearest the body are distinctly serrated. 

 Ventral ramus has bristles with the usual canaliculated tip, though 

 these are more slender than those which follow. 



The third parapodium bears a long and characteristic cirrus, 

 which stretches forward considerably beyond tip of the first parapo- 

 dium in a straight line. The cirrus is an elongated, smooth, tapering 

 process, and has a globular enlargement at base on the external side. 



In fally developed parapodia the ventral bristles are long, as 

 represented in PI. X, fig. 8. 



A well marked branchia, richly ciliated inferiorly, occurs on 

 every parapodium, and bears ventrally at base a diverticulum-like 

 process. Ciliated pads occur one under the branchia, a second 

 long and a third broadly clavate or fan- shaped one on the dorsum 

 of parapodium. 



Habitat :— " South of Yedo," 345 fathoms (" Challenger ") ; 

 Sagami Bay, 153 fathoms ("Albatross"); Yahagi-lino, in Sagarai 

 Bav, 260 fathoms. 



