TUNICATA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 93 



V. Station 325, 9-15 fathoms, April 1903 ; temp. 28 to 29 F. 



About a dozen specimens ranging from 11x7x5 cm. down to 5'5 x 5 x 3'2 

 cm. (one empty test). 



VI. Station 325, 9-15 fathoms, December 26, 1903 ; temp. 3l'4 F. 



(1) 4^x3x3 cm. 



Family STYELID.E. 



Styela lactea, Herdman. (Plate, figs. 1-8.) 



Styela lactea, Herdman, Challenger Report on Tunicate, Part I., p. 156. 

 Styela flexibilis, Sluiter, Charcot Exped., "Tuniciers," p. 36. 

 (]) Cynthia verrucoa, Lesson, Ceitt. Zool., p. 151. 



Localities. (1) Station 118, on hulks, Stanley Harbour, Falkland Islands. 



(2) Scotia Bay, South Orkneys, Station 325, February 2, 1904. 



(3) Attached to Holozoa cylindrical, thrown up on beach. Scotia Bay, January 

 17, 1904. 



(4) Station 118, shore pools, Port Stanley, January 1903. (Two elongated 

 specimens.) 



The specimens from the Falkland Islands are about twenty in number, ranging from 

 little globular spiky balls (see figs. 3, 4) of 1 cm. in diameter to irregular barrel-shaped 

 masses (fig. 1 ) of 8 cm. in length and 5 to 6 cm. in breadth. The specimens from 

 Scotia Bay attached to the compound Ascidian Holozoa cylindrica, Lesson ( = Distaplia 

 ignota, Herdman), are small and globular, bristling with short pointed spikes, and of a 

 pure white colour (fig. 2) ; while the remaining specimen from Scotia Bay (February 2) 

 is much larger, roughly cylindrical in shape, less spiny, and of a duller colour (fig. 1). 

 Still, all transitions in shape and appearance can be found between the extreme forms, 

 so there can be no doubt that all belong to the one species, S. lactea, found by the 

 Challenger Expedition at Kerguelen Island, and by the Southern Cross Antarctic 

 Expedition at Cape Adare. 



The largest Scotia specimens correspond closely with SLUITER'S S. jlexilnlis, found 

 during the Charcot Expedition at " He Booth Wandel." That species agrees in internal 

 characters with S. lactea so closely that I have no doubt that the two are the same, 

 and that S. flexibilis must be regarded as a synonym of S. lactea. It is, I think, 

 possible also that the Cynthia verrucosa of LESSON, found attached to Fucus on the 

 shores of Malonines Islands, Antarctic, which is figured as having five lobes round each 

 aperture, is really this same species. If so, the number of lobes shown by LESSON is, of 

 course, erroneous. 



The following additional characters, taken from the larger Scotia specimens, may be 

 useful to compare with the descriptions of other specimens : 



Size 7 x 4 x 3'5 cm. Barrel-shaped, attached by flat area at posterior end about 

 3 '5 cm. in diameter. Colour pale creamy white with a pinkish tinge in places. Test 



(ROT. HOC. EDIN. TRA.N8., VOL. XLVTII., 311.) 



