292 J. H. ASllWORTH. 



these might also be phiced in the genus Pseutloscali- 

 bregma. S. parvuni, Hausen, S. (Eumenia) lougise- 

 tosum, Tlieel^ and Eumenia reticulata, Mcintosh, prob- 

 ably belong here. 



S. parvnm agrees very closely with the abranchiate spe- 

 cimens of Scali bregma in my possession in the shape of 

 the prostomium and in the parapodia, which from the twelfth 

 segment to the posterior end of the animal form projecting 

 laminae, each bearing a dorsal and a ventral cirrus. 



Theel's Eumenia longisetosa differs markedly from E. 

 crass a in several respects, e. g. in the former the prosto- 

 mium is prolonged at each side into a well-marked tentacular 

 process; and though the first eleven pairs of parapodia are 

 small, those of the twelfth and following segments bear leaf- 

 like cirri. Levinsen (1883, p. 133) and von Marenzeller 

 (1892, pp. 401, 426) have realised that Theel's specimens 

 are more closely allied to Scalibregma than to Eumenia, 

 and have accordingly renamed them Scalibregma lon- 

 gisetosuin. The latter author suggests that the specimens 

 (which are about 12 mm. long) described by Hansen as S. 

 parvum are merely young forms of Theel's species, and 

 fi-om a comparison of the descriptions and figures of the pro- 

 stomia and parapodia I consider the evidence supports this 

 view very strongly. S. parvum and S. longisetosum 

 are, however, abranchiate, and should be separated on that 

 account from the genus Scalibregma. 



Eumenia reticulata, Mcintosh, is evidently nearly re- 

 lated to the foregoing, for its prostomium is prolonged into 

 tentacles, and its parapodia from the fifteenth segment 

 onwards to the posterior end of the body form projecting 

 lamellee, which Mcintosh compared to those of Theel's speci- 

 mens. Mcintosh (1885, p. 361) remarks that ''one of the 

 specimens presented the aspect, dorsally, of Scalibregma 

 without the branchias." 



Eumenia glabra, Ehlers, differs so considerably from 

 any of the species mentioned above, that it is doubtful 

 whether it should be included in any of the hitherto de- 



