24-4 ]\Ir. J. W. Prytle on Annelida PoJycluBta 



111 tins collection six exaniplos wevo obtained in a fry-not in 

 haul 68;'0 at 152 m. on (Uli February, 1907, at Station 39 B, 

 lat. o7° 59' N., lon^. 0" 57' E. The animals are very small, 

 the largest being aUout 2 inches long, but G to 8 inches is a 

 common size. Fr.>m accounts given by other writers the 

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

 di'pths ranging from 164- to 422 fathoms, 'Porcupine' 

 Expedition of 18G9, and from 257 to 358 fathoms by the 

 same Expedition of 1870. It extends to Norway and the 

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

 ' 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 G5 bristl 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 ti[) doisally, with two lateral 

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

 slender cirri, which the writer of the Monograph notes ])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 dursally, 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 tlie 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 the dorsal 

 portion of each foot is different fr()in the ventral. From the 

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

 agree with the descriptions laid down in the Monograph and 

 with the types on the slides, and in position on the bod}^ they 

 are situated more dorsally than ventrally. However, towards 



* Vide ' Monograph,' vol. ii. part ii. p. 499. 



