190 ART. ir. A. IZUKA : 



arising from the antero-lateral angle of prostomium, slightly 

 shorter than the medikn. 



Peristomium anteriorly overlaps the prostomium. Dorsal pair 

 of tentacular cirri much longer than the ventral pair. 



In the ventral aspect of the cephalic region there is a deep 

 sulcus (the mouth), bounded posteriorly by the lower lip, which 

 has a broad indentation in the middle. 



Habitat : — Sagami Bay, about 100 fathoms ; and Suruga Bay, 

 90 fathoms (Mr. K. Aoki). 



Syllis inflata Marenz. 



PI. XX., figs. 9—10. 

 1879. Syllis inflata, Marenzeller. Südjap. Auuel., p. 23. 



Body slender, consisting of about 130 segments, 25 mm. in 

 total length, 2.5 mm. in maximum breadth at about the posterior 

 end of the anterior fifth of the body ; tapering rapidly towards 

 anterior end, but gradually towards posterior. Dorsal surface of 

 body strongly arched, ventral surface almost flat. 



The colour of body appears yellowish to the naked eye ; 

 under the microscope there are observed three distinct brownish 

 transverse lines on the dorsal surface of each segment. 



Prostomium elliptical in outline, scarcely as long as J 

 the breadth. The three tentacles are of about similar length, 

 or the median tentacle is slightly longer than the two laterals, 

 which arise û'om the frontal margin of prostomium, while the 

 median tentacle arises from the dorsal surface of prostomium be- 

 hind the line of the base of lateral tentacles. 



Eyes four ; the anterior larger, reniform ; the posterior smaller, 

 roundish, situated close to the anterior. 



