Discovery reports (1962) Discovery reports discoveryreports30inst Year: 1962 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 char
Discovery reports (1962) Discovery reports discoveryreports30inst Year: 1962 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. 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).
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