THK OEI'HYREA OF JAPAN. 73 



i^enerally measure 1 mm. in length and O.l-") nun. m maximum 

 breadth, tapering towards the ])osterior end. As was pointed 

 ont by RiETscii, tiie skin-surface is thickly ciliated except on 

 tlio dorsal side where the cuticula is comparatively thicker than 

 in other regions. Two long and strongly curved hooks (/»/•) are 

 present in an anterior position ; behind tliem is seen a large 

 spermatic reservoir {sv) provided with a small funnel. The duct 

 of the reservoir begins just l)ehind the hooks and proceeds 

 anteriorly as a narrow tube to open at the apex of the body. 

 'Ulis canal {vd) is surrounded by a nerve-ring lying just in front 

 of the roots of the venti'al hooks. 



iral)itat : The species is common and readily discoverable in 

 shallow waters in the vicinity of Naha (on Okinawashima, one 

 of the Eiukiu Islands). In May, 1900, a few specimens were also 

 collected by Mr. jNTiyajtma at Kataura in the Province of 

 Satsuma. The worms live in holes which they bore in dead corals. 



BONELLIA MIYAJIMAI, n. sp. 



A tull description of this species together with figures, will 

 be given in another paper which will appear in this Journal. 

 Here will be given only tlie more important characters whicli 

 serve to distinguish the species. 



The l>ody nieasures about 2 cm. in length and 1 cin. in 

 maximum l)readtli, the proboscis being six times as long as the 

 body. The color is grayish brown. The ventral hooks, instead of 

 being present in a single pair, number 29 in all ; they are ar- 

 ranged on the ventral surface in no definite order. The internal 



