SABELLIDAE 189 



Oridia limbata (Ehlers). 



Oria limbata, Ehlers, 1897, p. 137, pi. ix, figs. 211-216. 



Fauvel, 1916, p. 476. 



Oridia limbata, Benham, 1927, p. 130. 



Occurrence. St. 164 (12); WS 564 (9). 



Specific characters. Up to about 5 mm. in length. The species is alleged to have 

 otocysts, a pair of cephalic and a pair of pygidial eyes. These are not visible in the 

 present specimens. There are 13 or 14 chaetigers of which eight are thoracic. A collar is 

 present forming a pair of small triangular lappets in the mid-ventral line. Above these 

 lappets is a pair of cirriform processes which I take to be intrabranchial filaments or 

 elongated barbules. There are three pairs of gills. The rachis of each filament has a 

 membrane or border and the barbules cease some distance from the tip. The thoracic 

 bristles are bordered capillaries and the thoracic hooks have a long curved manubrium 

 and about three rows of denticles above the main fang. The abdominal bristles are very 

 slender, unbordered capillaries. The hooks have a short, rounded base and on the face 

 a series of rows of denticles above the basal tooth. 



Remarks. I have not been able to see the bend in the shaft giving the geniculate 

 character to the abdominal bristles, but this may be the fault of the material. 



Genus Chone, Kroyer 



Branchiae symmetrical, not spiral, without eyes or dorsal appendages. A high palmar 

 membrane. Cirriform intrabranchial filaments often present. A well-developed collar. 

 No caudal membrane on the terminal segments. The first chaetiger carries bordered 

 capillary bristles. The bristles of the remaining thoracic chaetigers consist of bordered 

 chaetae and spatulate chaetae. The thoracic hooks have long downwardly directed 

 manubria. There are no pickaxe bristles. The abdominal hooks have short bases without 

 a posterior prolongation, and the abdominal bristles are narrow capillaries. 



Chone duneri, Malmgren. 



Fauvel, 1927, p. 336, fig. iij l-r. 

 Occurrence. St. WS 648 (numerous). 



Specific characters. These specimens are smaller than the northern representatives 

 of this species, but otherwise I can find no grounds for separation. They measure 

 12-13 mm. by i mm. for about 32 chaetigers, and I take them to be immature. There are 

 eight thoracic chaetigers. The gills end in long filiform tips and there is a palmar mem- 

 brane for more than half their length. The collar is entire, dorsally oblique and joins 

 on each side of the mid-dorsal line a pair of longitudinal lobes. The dorsal thoracic 

 bristles consist of bordered capillary chaetae and spatulate bristles : the thoracic hooks 

 have long manubria and crests of denticles above the main tooth. The abdominal 

 bristles are long and very slender capillaries with extremely fine borders. The ab- 

 dominal hooks have a characteristic appearance well shown in Fauvel's fig. r. They have 

 a short, square base and a main tooth surmounted by denticles. 



17-2 



