180 Mr., W. Small on Annelida Vohjclmia 



species of Antinoe or in the genus Ilarmotkoe or Polynoe 

 so long as Antinoe remains a genus apart from Ilarmothoe, 

 however closely the former may approach the latter. 



While Theal's description of Poli/noc hadia and varieties 

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

 that tiie inferior ventral bristle which is diagnostic of Antinoe 

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

 in every specimen. Again, a cerfain aspect of tiie superior 

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

 a young specimen of Polynoe hadia, 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, intermediate, and 

 adult forms may alone be conclusive. 



Genus Malmguenia, M'Intosh, 1876. 

 Malmgrenia castanea, M'l., 1876. 



Three very small fragments of this annelid were faken in 

 the same haul as contained tlie fragments of Evarne johnstoni 

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

 round these shores. 



Tlie head appears to be broader in front tlian 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 lias no eyes; in another 

 the pairs of eyes are so close togetlier as to touch. 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 //. gelatinosa as 45. The number in the present example 

 is only 17. 



