ö AKT. II. A. IZÜKA : 



ill addition to n Jialf-iing of comb-like teeth supported 



on a slight shoulder ScaUseiosus. 



a". Tentacles 2, their basal joints formed by the anterior tips of 

 prostoraium Iphione. 



Genus Polynoë Savigny. 



Prostominm bilobed ; anterior tip of the lobes produced to form 

 basal joint to lateral tentacle on the same level as the basal joint 

 of median tentacle. Dorsal ramus of parapodia decidedly smaller 

 than ventral ramus, often minute, bearing bristles more slender than 

 ventral liristles and which are sometimes very minute and few in 

 number or are sometimes even wanting. Ventral ramus much 

 larger and longer bearing a moderate number of bristles which are 

 stouter and usually longer than those of dorsal ramus. Both dorsal 

 and ventral rami not prolonged into a finger-like process beyond 

 insertion of the bristles. Elytra from 12 to over 50 pairs in 

 number. Body sometimes excessively long ; segments 26 to 100 

 or more. 



Folynoë gyinnonota Marenz. 



PI. Ill, figs. 1—4. 



1879. Polynoë (Lepidouotus) gymnonotns, Mareuzeller, Siidjap. Annel. 



T, p. 4, Taf. I, fig. 3. 

 1885. Lepidonotus gymnonotns, Mcintosh, " Challenger " Annel. p. 64, 



pi. X, fig. 4. 



This is one of the most common species of the genus in the 

 Japanese waters, occuring almost everywhere under stones between 

 tide -marks and also at some depth under water. 



A large example consisting of 27 segments may measure 44 mm. 

 in length and 16 mm. in breadth. Body thick, measuring about 

 7 mm, in height at about the 15tli segment. 



