On fcne Pelagic Aunolids of Japan. 9 



tentacles at anterior end of prostoraium are rather short, as shown 

 in fig. 11. Median tantacle shorter than § the length of 

 paired tentacles, placed just behind the line of the anterior border 

 of eyes. 



Of the 4 pairs of tentacular cirri, the anteriormost is the 

 shortest. The length gradually increases posteriorly to the 3rd 

 pair. The 4th pair is especially long, being about twice as long as 

 the first, each showing a distinct basal joint. 



Parapodium (PL I, fig. 12) conical, with dorsal and ventral 

 cirri; cirriform appendage absent. 



First pair of parapodia bears, in addition to an aciculum, two 

 simple and stout bristles and one or two very fine and long 

 compound setae; dorsal cirrus large and leaf-like, in the dorsal 

 aspect entirely covering over the parapodium proper ; ventral 

 cirrus much smaller. 



Second pair of parapodia is essentially like the first except in 

 being provided with a bundle of 4 or 5 simple and stout bristles 

 which extend Lionel tip of the parapodium, and with a few very 

 fine and long compound setae. 



The simple bristles decrease in number posteriorly becoming 

 single in 13th or 14th segment. The compound setse gradually 

 increase in number from the first segment, in which there exist 

 only one or two of them; posteriorly to middle segments, in which 

 they constitute a pretty large bundle. 



In posterior region of body, the parapodia gradually grow 

 smaller; at the same time the compound setae diminish in number. 



Anal segment bears a pair of long anal cirri. 



In a sexually mature male specimen, a pair of elongated bags 

 filled with spermatozoa was observed in each of the 10th, 11th, 

 12th and loth segments. 



Proboscis short, twice as long as broad, with papillae on 

 anterior border in the protruded state. 



Habitat:— Misaki, March 30th, 1904. 



