DESCRIPTION OF SPECIES 123 



Arnback (1938, p. 37) discusses the possibility that P. scotti Herdman and P. antarctica van Beneden 

 are identical with P. georgiana. 



There is a single record of two specimens from the northern part of the Argentine coast, 37 50' S., 

 56 11' W., by Arnback (1938). This is a locality far north of all others from which P. georgiana has 

 been taken and were it not given on Arnback's authority the record would require confirmation. 



Distribution. Antarctic (South Georgia), Subantarctic (north coast of Argentine). 



10 M 



200m 



Text-fig. 50. Pyura georgiana Michaelsen : A, section through the parietal organ to show vesicles (v.); 

 B, part of a vesicle, at higher magnification, to show vacuolated cells (v.c). 



Pyura bouvetensis (Michaelsen) (Text-fig. 47 G, H, J; PI. IV, figs. 4, 5) 



Boltenia bouvetensis Michaelsen, 1904, p. 216, pi. 10, fig. 6; pi. 11, figs. 23, 24. 



Boltenia salebrosa Sluiter, 1905, p. 474; 1906, p. 45; 1906a, p. 554. 



Boltenia turqueti Sluiter, 1905, p. 474. 



Boltenia turqueti Hartmeyer, 1909-11, p. 1342; Sluiter, 1914, p. 11; Arnback, 1938, p. 37; van Name, 1945, 



P- 331- 



IPyura legumen Kott, 1954, p. 124. 



Occurrence. St. 170: S. Shetlands, 342 m. St. 181: Palmer Archipelago, 160-335 m. St. 187: 

 Palmer Archipelago, 259-354 m. St. 190: Palmer Archipelago, 93-126 m. and 315 m. St. 195; 

 S. Shetlands, 391m. St. 599: S. Shetlands, 203 m. St. 600: S. Shetlands, 501-527 m. St. 1952: 

 S. Shetlands, 367-383 m. St. 1955: S. Shetlands, 440-410 m. 



External appearance (Text-fig. 47 G; PI. IV, figs. 4, 5). The largest of the many specimens has 

 a stalk of 21 -o cm. and a body of 3-0 cm. long (antero-posteriorly) by 2-3 cm. high (dorso-ventrally). 

 In the smallest complete specimen the stalk is 3-0 cm. and the body 1-2 cm. long by i-i cm. high. 

 The stalk originates from the antero-ventral part of the body, is moderately thick here, and becomes 

 gradually thinner towards the lower end. A stalk so slender and flexible could not support the body 

 which may in fact rest on the bottom (Text-fig. 47 J). In appearance and texture the surface of the 

 body varies from brown, wrinkled and fairly tough to pale ochre, smooth and so thin as to be semi- 

 transparent. In the latter case the parietal organs, gut and branchial folds can be seen through the test. 

 A slight swelling, small disc, or group of root-like processes serve to attach the stalk to the substratum. 

 The surface of the test is beset with short conical spines each standing on a circular disc-shaped area of test 

 (Text-fig. 47 H). These spines are very different from those of either P. legumen or P. georgiana. 



16-2 



