24 



Ait Iba izuka. 



Specimen B. — From Uraga Channel ; 70 fathoms ; captured Aug., 

 1898, by Mr. A. OwSTON and presented by him to the Science College. 

 Length, 225 mm.; consisting of 99 segments. Maximum breadth of 

 the body (on the 18th segment), 24 mm. including the parapodia and 

 setae, but 18 mm. in exclusion of these. The last segment on the 

 piece is respectively 16 ;//;;/. and 10 mm. broad when measured in the 

 corresponding way. Maximum thickness, 16 mm. 



Specimen C. — Obtained in the Sagami Bay, June 1900 ; 100 fath- 

 oms ; preserved in the Science College. This is the smallest fragment 

 of all ; it has the proboscis completely protruded. The anterior part of 

 the specimen, together with the proboscis, is shown in Pl. I., fig. 1. 



Length of the specimen, 170 vim., 

 with 73 segments. The maximum 

 breadth including seta; 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 the hindmost segment is 

 22 mm. and 9 mm. respectively. Maxi- 

 mum thickness,- 1 6 mm. 



Specimen D. — From south of Bö- 

 shü ; depth unknown. This is the 

 largest, measuring 525 mm. in length, 

 and consists of 120 segments. Maxi, 

 mum breadth, 44 mm. including setae 

 and parapodia, and without these 29 

 mm. Breadth of the last segment 30 

 vim. with, and 1 1 mm. without, seta; 

 and parapodia. Maximum thickness 

 28 vim. The specimen was acquired 

 by the 6th Higher School at Okaya- 

 ma from Mr. Shimazu of Kyoto. 



Dorsal view of the anterior end of 

 Specimen D. % natural size. 



