66 AET. TT. — A, TZITKA : 



Genus I*anthalis Kiiiborg. 

 Elytra sniüotli, Hat, rounded or campanulate ; covering the 

 anterior pavt;^ of dorsuîTi, but leaving the rest of latter bare along 

 tlie middle. Parapodiuni with a dorsal process in front, a ti'ilobed 

 median and a small ventral process. Dorsal setae briishdike at 

 the tip (bipennato-penicillate, Kinberg) ; median setae spinous on 

 one side, terminating in a long whip (arista te, Kbg.) ; ventral setae 

 thiiilv tapering, spinous wâtli curved tip (subulato-serrate, Kbg.). 



Panthalis ^nitsiuairH Izuka. 



PL Yin, figs. 7—9. 

 1904. Pantlialis mitsuknrii, Izuka. Aniiot. Zool. Jap. Vol. V, p. 23, PI. 



T, figs. 1-8. 

 All the five specimens of this species hitherto obtained are 

 more or less incomplete Iti that they lack the posterior parts, 

 though always preserving the head end. Tliey come from a con- 

 siderable depth in tlie Sagami Pay and the adjacent waters. Phe 

 lai'gest specimen from south of Posliiu, consisting of the prosto- 

 mium and succeeding 120 segments, measures 525 mm. in length ; 

 maximum breadth 44 mm. including setae and parapodia, and 

 without these 29 mm. Breadtli of the 120th segment 30 mm. with, 

 and 11 mm. without, setae and parapodia. Maximum tliickness 

 28 mm. The one that obtained in the Sagami Pay, June 1900, 

 100 fathoms is the smallest fragment of all; it lias the proboscis 

 completely protruded. Pength of the specimen, 170 mm., with 73 

 segments, Maximum breadth including setae and parapodia, in 

 the region of about the 18th segment, is 24 mm.; without them it 

 is 14 mm. in the same region. Measured in the same way, the 

 breadth of tlie hindmost segment is 22 mm. and 9 mm. respectively. 

 Maximum tliickness, 16mm. 



