DISOMIDIDAE. 369 



cc. Branchiae beginning caudad of the fifth setigerous somite. 



d. Hooded crochets beginning on the seventh setigerous somite Polydora Bosc. 



dd. Hooded crochets first appearing on the eighth setigerous somite Carrazki Mesnil. 



hh. The fourth setigerous somite specially modified. 



Reproducing by terminal buds as in many .syllids Polydorella Augener. 



Synonymy of Genera. 



Nerinopsis Ehlers (1912), based upon certain pelagic and larval specimens 

 (Chaetosphaera) secured by the Gauss as well as by the British National 

 Antarctic Expedition, is of doubtful position. Even the largest specimens 

 wholly lacked the hooded crochets characteristic of the other spionids, and the 

 form is placed by Ehlers in the Spionidae with some doubt. 



Hekaterobranchus Buchanan (1890) seems to be the same as Streblospio 

 Webster (1879) as at present defined. 



Leucodore Johnston is synonymous with Polydora Bosc. 



Malacoceros and Uncinia Quatrefages and Colobranchus Schmarda are 

 synonyms of Scolelepis Blainville. Scolclepis Blainville has been subsequently 

 wTitten in the modified form Scolecolipis by Malmgren and others. 



Chaetosphaera Hacker was proposed for certain widespread spionid larvae, 

 the affinities of which are not yet known. 



BOCCARDIA. 



Carrazzi, Mitth. Zool. stat. Neapcl, 1893, 11, p. 15. 



BoCCARDIA POLYBRANCHIA (HaSWell). 



Puhjdora polijbmudUa Harwell, Proc. Linn.. sec. N. S. W., 188.5, 10, p. 273; Lo Bianco, Atti H. acad. 



sci. fis. nat. Napoli, 1893, 5, no. 11; Ehlers, Fostsch. K. gesellsch. Gottingen, 1901, p. 164. 

 Boccardia polybranchia Carazzi, Mitth. Zool. stat. Neapel, 1891, 11, p. 1.5, pi. 2, fig. 1-3; Mesnil 



Compt. rendus Acad, sci., 1893, 117, p. 643. > 



Polydora (Bocciirdia) polybrii.ii.chia Mesnil, Bull. sci. France Belgiquo, 1896, 29, p. 221; Ehlers, Polych. 



Magahl. sammel., 1897, p. 87; Nach. Geselsch. wiss. Gcittingcn, 1900, p. 217. 



A single specimen of this species is in the collection, Ijut labeled simply 

 Albatross. The species occurs commonly on the South American coast as well 

 as in the Australian region. 



DiSOMIDlDAE. 



Key to Genera. 



a. Prostomium without tentacular processes; both neuropodial and notopodial cirri well developed 

 on the first parapodia; notopodial setae of the most posterior somites stout spines forming star- 

 shaped dorsal clusters Disomides, nom. nov. 



