TUNICATA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 311 
Y. Station 325, 9-15 fathoms, April 1903 ; temp. 28° to 29° F. 
About a dozen specimens ranging from 11 x7 x5 cm. down to 55x 5x 3°2 
em. (one empty test). 
VI. Station 325, 9-15 fathoms, December 26, 1903; temp. 31°°4 F. 
(1) 44x 3x3 em. 
Family STYELIDA. 
Styela lactea, Herdman. (Plate, figs. 1-8.) 
Styela lactea, Herdman, Challenger Report on Tunicata, Part I., p. 156. 
Styela flexibilis, Sluiter, Charcot Exped., “Tuniciers,” p. 36. 
(2) Cynthia verrucosa, Lesson, Cent. 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 cylindrica, 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 
wgnota, 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 Siurrer’s S. flexibilis, found 
during the Charcot Expedition at “Ile 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. flewibilis must be regarded as a synonym of S. lactea. It is, I think, 
| possible also that the Cynthia verrucosa of Lxsson, 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 Lxsson is, of 
course, erroneous. 
The following additional characters, taken from the larger Scotew specimens, may be 
useful to compare with the descriptions of other specimens :— 
Size 7x4x3'5 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 
