froyn the JSorth Sea and aJJacent jjciris. 267 



to 10 fathoms. For the only representative of the Pbj'llo- 

 docidaj no depth can be given, as tlie label belonging to the 

 tube has been lost, ])rol)ablj in the disastrous fire which took 

 place in the laboratory in June 1913; when much valuable 

 nuiteiial was lost. 24 fathoms is the greatest depth at which 

 Hesionida3 were obtained, although they were found in 

 numerous hauls. 



No lists of synonyms have been given, but they can be 

 obtained from Prof. M'Intosh''s Monograph (vol. ii. part i., 

 1908) under the heads of the various species, and they 

 occupy a considerable amount of space. 



The specimens examined were part of the collection kindly 

 handed over to Mr. Small by Prof. D'Arcy W. Thomson. 

 I have to thank Prof. M'Intosh for giving me from his own 

 collection a typical series of slides of each group. 



Family Nephthydidae. 

 Genus Nephthys, ('uvier, 1817. 



Nephthys cceca, O. F. Miiller, 1776. 



This species was found in many hauls, and ordy in one 

 (haul 11191, at Station 18 a) were there not more than one 

 brought to the surface. In havd 187 forty-two were obtained 

 at a depth between 5-15 and 788 m. This abundance agrees, 

 as far as the North Sea is concerned, with the statement in 

 the Monograph (1908, vol. ii. part i. p. 10), which says that 

 this annelid is common everywhere around the shores of 

 Briiain. 



Many of the specimens are small, but some are of moderate 

 size. In many cases the lamellae of the feet were destroyed 

 by being scorched by the fire, while the specimens themselves 

 were rendered hard and brittle. On the feet of those which 

 remained unhurt were found several thecate Infusoria * and 

 structures which resembled minute Loxosomoe. 



The largest specimen had 14:8 segments, but in some of 

 the smaller ones the segments numbered from 60-80. The 

 body-wall was very muscular, and the oblique muscles were 

 boldly outlined. 



The gut was examined, and was found to contain diatom?", 

 mud, sand-particles, and small pieces of what seemed to be 

 animal tissue. No specimen showed an extruded proboscis. 



Prof. Izuka f found this annelid in Japanese waters in 



* Cf. * Challenger ' Report on Annelida, pis. xiv. a. and xxiii. a. 

 t Vide ' Enantiate Polychseta of Japan,' by Prof. A. Izuka. 



