SIPUNCULIDAE 251 



The portion of the body carrying the girdle of vesicles varied greatly in shape. In 

 some specimens it was of the same diameter as the body but in others was swollen to 

 varying degrees, in the extreme case being almost like a ball, with the viscera showing 

 through the wall. Where this portion was greatly expanded the 'tail' was usually 

 prominent, but in two of the smaller specimens the tail was very inconspicuous and the 

 area with vesicles narrow so that the end of the body looked rounded with the girdle 

 like a cap at the end. 



Most of the specimens were not fully expanded but, allowing for this, a comparison 

 of the lengths of the animals is interesting. Most of Theel's specimens from South 

 Georgia were small, but his specimens from Graham Land region he called ' large ' ; the 

 largest was, however, only 100 mm. in length. While the three specimens taken at the 

 Falklands and South Georgia were small, measuring some 15-45 "^"^- iri length, the 

 specimens from the Ross Sea were almost all large, in most cases greatly exceeding 

 100 mm. For example, at St. 1645 the largest specimen, fully expanded, measured 

 250 mm., while two others, not fully expanded, measured 190 and 140 mm. respectively. 

 At Sts. 1651 and 1653 specimens equally large were taken. At St. 1659 the specimens 

 tended to be smaller, being only some 130-140 mm. in length. 



The species seems to live in moderately deep water. Theel gave a record from South 

 Georgia of only 75 m. but the Discovery specimens ranged from 120 to 594 m. 



7. Phascolosoma margaritaceum Sars. Plate VIII, figs. 3, 4. 



Sipunculus margaritaceus Sars (1851, p. 196). 



Phascolosoma capsiforme Baird (1868, p. 83). 



P. antarcticum Michaelsen (1889, p. 3). 



P.fuscum Michaelsen (1889, p. 3). 



P. georgianum Michaelsen (1889, p. 3). 



P. margaritaceum Sars var. capsiforme Baird, Fischer (1896, p. 3). 



P. margaritaceum Sars ?, Theel (191 1, p. 26). 



P. margaritaceum Sars, Fischer (1920, p. 409). 



P. socium Lanchester (1908, p. i). 



P. antarcticum Herubel (1908, p. i). 



P. margaritaceum var. capsiforme Baird, Benham (1922, p. 7). 



P. capsiforme Baird, Pratt (1898, p. 16); Shipley (1902, p. 285). 



Distribution. Falkland Islands: Baird, Theel, Pratt. 

 South Georgia: Michaelsen, Theel. 

 Tierra del Fuego: Theel. 

 Graham Region: Theel, Fischer. 

 Cape Adare: Shipley. 

 Port Charcot: Herubel. 

 Commonwealth Bay: Benham. 

 Ross Sea: Lanchester. 



Occurrence. Off Patagonia: St. WS 89. 21-23 "^^ One small specimen. 



St. WS 788. 82-88 m. Five medium-sized and small specimens. 

 Falkland Islands: St. WS 73. 121m. Six small and three very small specimens. 

 St. WS 80. 152-156 m. One medium-sized specimen. 

 St. WS 84. 74-75 m. Three medium-sized, two small specimens. 



