180 Mr. W. Small on Annelida Polychceta 



species of Antinoe or in the genus Ilarmothoe or Polynoe 

 so long as Antinoe remains a genus apart from Ilarmothoe, 

 however closely the former may approach the latter. 



While Theel's description of Polijnoe hadia and varieties 

 (1879, pp. 18-20) may apply to these forms, it is curious 

 that the inferior ventral bristle which is diagnostic ol Antinoe 

 elegans and is figured by Theel (1879, pi. i. fig. 16) is present 

 in every specimen. Again, a certain aspect of the superior 

 ventral bristle resembles Thdel's figure of a ventral bristle of 

 a young specimen of Polynoe badia, one of whose synonyms 

 is given by Theel as Antinoe sarsi. 



It is most probable that Theel's Polynoe hadia and Dylgia 

 elegans are one and the same form. Again, researches into 

 the differences in structure between young, intermediatCj and 

 adult forms may alone be conclusive. 



Genus Malmgrenia, M'Intosh, 1876. 

 Malmgrenia castanea, M'l., 1876- 



Three very small fragments of this annelid were taken in 

 the same haul as contained the fragments of Evarne joknstoni 

 and Antinoe sarsi. M. castanea has been recorded from all 

 round these shores. 



The head appears to be broader in front than behind and the 

 anterior eyes are more widely separated from each other than 

 usual. Stress cannot be laid on these points because of the 

 scarcity of material, but it is remarkable that the only two 

 anterior fragments present these appearances. 



Genus Halosydna, Kinberg, 1857. 

 Halosydna gelatinosa, M. Sars, 1860. 



The only complete specimen is a comparatively small one 

 of 20 mm. in length. One specimen has no eyes; in another 

 the pairs of eyes are so close together as to toucli. The 

 enlargement of the median tentacle below the filiform tip is 

 prominent, and the same remark holds for the tentacular cirri, 

 which are almost as long as the median tentacles. A semi- 

 lunar membrane extends from the first body-segment forward 

 over part of the head. The palps are massive and trans- 

 versely striated. 



St. Joseph (1888, p. 155) gives the number of segments 

 of a //. gelafinosa as 45. The number in the present example 

 is only 17. 



