IS8 



DISCOVERY REPORTS 



2mm 



and about the last 20 chaetigers are free from eggs. The prostomium is bluntly conical 

 and without eyes. The buccal and the two (.'') following segments are long, achaetous 

 and indistinctly separated. As in Hetero- 

 cirrus (see Fauvel, 1927, p. 96), on the last 

 achaetous segment or on the anterior border 

 of the ist chaetiger there is a pair of gills 

 and a pair of coiled palps (Fig. 62) which 

 are about equal in length to the first ten 

 chaetigers. The gills are for the most part 

 lost, but it can be seen that they are con- 

 tinued for at least the anterior two-thirds 

 of the body. They are very long, a gill 

 from the middle of the body being equal in 

 length to about 15 chaetigers in the middle 



^0 



Fig. 62. Tharyx cpiloca. Anterior end. (Position 

 of the gills indicated by the broken lines.) 



of the body. After the 30th chaetiger the body is no longer swollen with eggs, and 

 the segments are half the length of those in the sexual region. 



The bristles consist of very long fine capillary chaetae, in length about equal to twice 

 the breadth of the body. There are no hooks. 



The pygidium is conical and the anus terminal. 



Remarks. The position of the first gill and palp would seem to refer this form to 

 Heterocirriis, Grube; on the other hand, the absence of crochets in the feet is charac- 

 teristic of Tharyx. This species is very close to, and possibly identical with, Hetero- 

 cirriis dndnnatus, Ehlers (1908, p. 129) from 48° 57' S, 70° W. The differences are 

 these: Ehlers' type specimen measured 18 mm. by 1-5 mm. for no segments; Ehlers 

 states that towards the posterior end of the body the segments are longer than in the 

 middle ; Ehlers describes a pair of gills only on the last achaetous segment and places 

 the palps on the ist chaetiger. My specimen measures 27 mm. by 3 mm. for 50 

 chaetigers ; towards the posterior end the segments are much shorter than in the middle 

 of the body and both ist gill and palp are on the same segment. The examples from 

 Auckland Island referred to Ehlers' species by Augener (1924, p. 81) have hooks, and 

 are therefore wrongly attributed. 



South Georgia (St. 29. 16. iii. 26. West Cumberland Bay, South Georgia; 5-9 miles 

 S 51° W of Jason Light, 23 m. Gear DC. Bottom: mud and stones) yielded another 

 epitocous female, with all its gills and palps broken or lost. As far as can be seen, the 

 arrangement of the palps and gills is the same as in Th. epitoca; on the other hand, 

 the body is much more slender and thread-like and the segments more numerous. The 

 measurements are 30 mm. by -5 mm. for about 120 chaetigers. The bristles are all 

 capillary. It may be conspecific with my specimen from Bismarck Strait. 



