EEEANTIATE POLYCHAETA OF JAPAN. 183 



Pharynx long, sinuous, armed with a tooth and a circle of 

 papillae. Pharyngeal glands posteriorly situated ; ventricle small, 

 witli two minute caeca. 



Body of a few segments ; cirri thread-like, not articulated 

 (LanCtERhans). Ventral cirrus lanceolate. Falcate bristles 

 bidentate. Penultimate segment provided with two pairs of cirri 

 (Malaquins). 



Amhlyosyllis speciosa n. sp. 

 PI. XX, fig. 1. 



Prostomium small, bluntly triangular, with one angle pointed 

 anteriorly ; with three long and slender tentacles, the median being 

 about twice the lengtli of the two laterals ; all of them indis- 

 tinctly annulated. Eyes four, yellowish red, situated obliquely en 

 each side, those of the anterior pair mueli larger and slightly 

 vv'ider apart than those of tlie posterior, the pair on each side 

 almost connate. Peliind tlie eyes are two ciliated nuchal wrings 

 of a light yellowisli tint ; posterior end of the wings reaching 

 to middle of second l)ody- segment. 



Body about 10 mm. in length excluding tentacles and anal 

 cirri; consisting of in segments, of which 13 are parapodiated ; 

 both first and penultimate segments provided only with a long 

 dorsal and a .slinrt ventral cirrus on each side. 



The breadth increases gradually from the first segment to 

 the sixlli, where it measures about 1 mm.; on the seventh seg- 

 ment it al)i'iii)(]y increases to 1.0 mm., and thereafter it remains 

 nearly the same to tlic I Ith segment; with deep indentation at 

 intersegmental sutures. Penultimate segment somewhat pear- 

 shaped, longer (lian ])i'oad, being about 1.2 mm. in breadth. 



