244 Mr. J. W. Prjde on Annelida Polyclueta 



111 this collection six examples were obtained in a fry-net In 

 liaul 68M0 at 152 m. on 6th February, 1907, at Station 3i) B, 

 lat. 57° 59' N., long. 0° 57' E. The animals are very small, 

 the laro-est being; about 2 inclies long, but 6 to 8 inches is a 

 common size. From accounts given by other writers the 

 above species is a deep-water form, having been obtained at 

 depths ranging from 164 to 422 fathoms, 'Porcupine' 

 Expedition "of 1869, and from 257 to 358 fatlioras by the 

 same Expedition of 1870. It extends to Norway and the 

 shores of Greenland, but neither Izuka nor the writer of the 

 ' Challenger ' Report makes any mention of it. 



The head is small and conical, and agrees with the descrip- 

 tion laid down in the Monograph *. The proboscis is 

 unarmed. 



The body of the largest has about 65 bristh d segments. 

 It is stout in comparison with its breadth and attains its 

 maximum breadth about the anterior ninth or tenth, where 

 it measures about 4 mm. From this part it tapers quickly 

 anteriorly, but more gradually posteriorly till it ends bluntly, 

 the anus being situated at the tip dorsally, with two lateral 

 flaps, a ventral process and papilla, and with two very long 

 slender cirri, which the wa-iter of the Monograph notes j)ass 

 off from the anterior part as in Aricia latreillii. The dorsum, 

 except in the first five segments, is flat, while the ventrum 

 is rounded. Gradually, however, a groove appears ven- 

 trally, deepens and becomes more prominent towards the 

 caudal region, which is absent in several of the specimens. 

 The peristomium is narrow dorsally, but broad ventrally, the 

 mouth occupying the position of the median ventral line at 

 the posterior border of the segment. In shape the mouth 

 resembles a sunken pit with smooth rounded sides, having 

 two prominent crescentic lips, which are lateral in position, 

 but there are no longitudinal symmetrical furrows passing 

 forward from the segments behind. The proboscis, which is 

 not extruded in any, is a deeply frilled organ which projects 

 from the mouth as a button-like process. The Monograph 

 adds " There are about ten frills in the form of a rosette." 



The feet commence at the second segment and continue to 

 the anus, but in the first twenty or thirty segments tlie dorsal 

 portion of each foot is different from the ventral. From the 

 thirty-first, however, both portions are similar. The feet 

 agree with the descriptions laid down in the Monograph and 

 with tlie types on the slides, and in position on the body they 

 are situated more dorsally than ventrally. However, towards 



* Vide ' Monograpb/ vol. ii. part ii. p. 499. 



