i64 DISCOVERY REPORTS 



Remarks. All the examples are small and immature. They are easily distinguished 

 from the Antarctic Isornastus perarmatiis, Gravier, by the presence of hooks only in the 

 8th and 9th chaetigers. The only other record of this species from colder southern 

 waters is that from Kerguelen. 



Capitella capitata (Fabricius), var. antarctica, var. nov. 



St. MS ?. 13. X. 25. From kelp root, Cumberland Bay, South Georgia. Four specimens. 



Description. The largest example measures no mm. by 2 mm. for 120 chaetigers. 

 I regard these specimens as representing an intermediate form between C. capitata and 

 Isornastus perarmatus, Gravier, 



The 8th and 9th chaetigers have no capillary chaetae, and in this the specimens are 

 distinct from /. perarmatus. On the other hand, the copulatory armature of the male 

 corresponds closely to that of Gravier's species. The modified bristles are plainly visible 

 at maturity, and those of the 8th chaetiger overlie those of the 9th. Exactly as Gravier 

 describes, there are five to six crochets on each side in the 8th chaetiger, and four 

 crochets on each side in the 9th. In the abdomen the pads carrying the rows of hooks 

 are more developed than is usual in C. capitata. 



This form can be considered either as a C. capitata, with an unusually highly 

 developed copulatory apparatus, or as an /. perarmatus, in which the capillary bristles 

 are lacking from the 8th and 9th chaetigers. 



Genus Notomastus, Sars 

 Notomastus latericeus, Sars. 



Fauvel, 1927, p. 143, fig. 49 a~h. 



St. 27. 15. iii. 26. West Cumberland Bay, South Georgia. 3-3 miles S 44° E of Jason Light. 

 1 10 m. Gear DL. Bottom : mud and rock. Four specimens. 



St. 159. 21. i. 27. 53° 52' 30" S, 36° 08' 00" W. 160 m. Gear DLH. Bottom: rock. One 

 specimen. 



Remarks. This species has been previously recorded in southern waters from Bouvet 

 Island. 



? Notomastus lineatus, Claparede. 



Fauvel, 1927, p. 145, fig. 51 a-i. 



St. 152. 17. i. 27. 53° 51' 30" S, 36° 18' 30" W. 245 m. Gear DLH. Bottom: rock. One 

 specimen. 



Remarks. A fragment consisting of 24 chaetigers. I have compared this specimen 

 with a number of examples of this species from Naples, and except that in the Mediter- 

 ranean examples the branchial prolongations of the ventral tori are larger and more 

 bulbous, I can find nothing to separate them, 



A confusion of locality labels may possibly have occurred, for it is otherwise hard 

 to account for the presence of this shallow-water Mediterranean species below the 

 200 m. line in sub- Antarctic waters. 



