i 4 2 DISCOVERY REPORTS 



recently dead when ingested by the ascidian as the guts of the crustaceans contained recognizable 

 food particles. Inorganic particles, mainly sand grains, were found in only a few specimens and never 

 in great quantity. The food of this ascidian can therefore be said to be principally live plankton rather 

 than organic debris. 



Remarks. The record from St. MS 71 is interesting as it extends the known range of the species 

 as far as South Georgia. 



Distribution. Antarctic (South Georgia), Subantarctic (Falkland Islands, Patagonian Shelf, 

 Magellan region, coast of Chile). 



Genus Eugyra Alder & Hancock, 1870 



Eugyra kerguelenensis Herdman (Text-fig. 64) 



Eugyra kerguelenensis Herdman, 1881, p. 237. 

 For synonymy see Kott (1954), p. 139. 



Occurrence. St. 1941: S. Georgia, 38 m. St. WS854: Patagonian Shelf, 97 m. St. WS856: 

 Patagonian Shelf, 104 m. 



ov 1 



Text-fig. 64. Eugyra kerguelenensis Herdman (St. 1941): Gonad. 



External appearance. The largest specimens are those from the Patagonian Shelf, which reach a 

 greatest diameter of 20 mm. These equal in size the largest yet found, which were described from 

 Kerguelen by Kott (1954). The specimens from South Georgia in the 'Discovery' collections range 

 from 8 to 18 mm. In all specimens the surface of the body has a coat, sometimes not very thick, of 

 moderately long, unbranched hairs to which sand and mud adheres. The body is ovoid to globular. 

 There is generally a sunken area round the siphons, sometimes with four grooves running from its 

 corners as described by van Name (1945). 



Body wall. Muscles, both longitudinal and circular, are best developed on and near the siphons. 

 There is, in addition, a narrow row of transverse fibres overlying the endostyle, as already described 

 by other authors, but I have found this band to continue in some specimens across the dorsal part of 

 the body and down its posterior surface. 



Tentacles. The oral tentacles usually number only ten to thirteen, even in quite large specimens. 



Dorsal tubercle. Van Name (1945) shows and describes the dorsal tubercle as having an 'almost 

 completely closed ring-like opening ', but the ' Discovery ' animals have a more nearly C-shaped or 

 crescentic slit. 



Branchial sac. The branchial sac does not differ from previous accounts. 



