DESCRIPTION OF SPECIES 133 



but van Name (1945) noted that it is sometimes almost smooth. In the 'Discovery' animals dis- 

 sected, the lamina is distinctly toothed throughout its whole length. Small papillae were present on 

 the branchial wall of the type specimens and a few were also seen in the ' Discovery ' material (Text- 

 fig. 57 D, p). They are probably the rudiments of new transverse bars. 



Gut. The curvature of the secondary loop is rather less than in the type specimens. 



Gonads. The position of the gonads is characteristic of the species, the left one bent round the 

 intestinal loop (Text-fig. 57 A), and the right one bent round the renal sac. The ovary (ov.) is narrow 

 and tubular, and is bordered by lobed testis follicles (t) along its whole length. Both oviduct and 

 sperm duct are long and straight, and are embedded in the body wall. 



1.0 cm 



Text-fig. 57. Molgula malvinensis Arnback (St. 159): A, specimen removed from test; B, oral tentacle; 

 C, dorsal tubercle, with ganglion and neural gland; D, part of branchial wall. 



Remarks. As pointed out by van Name (1945) this species resembles M. occidentalis Traustedt. 

 It is even more like M. pyriformis Herdman. From these two species it can be distinguished as shown 

 in Table 36. 



M. pyriformis rests on a single specimen and as the differences separating it from M. malvinensis 

 are not great it might be possible to unite it with that species if more specimens could be examined 

 from the area from which the type of M. pyriformis was obtained. In the meantime, however, the 

 two species must be recognized. 



Distribution. Antarctic (South Georgia, Shag Rocks; Kerguelen), Subantarctic (Falkland 

 Islands; Macquarie Island). 



