ANTHOMEDUSAE 21 



Occurrence: Stns 114, 115, 120, 151, 382, 395, 454, 662, 663, 666, 958, 1458, 1559. WS 20, WS37, WS 385. 

 (For details, see Table i.) 



Altogether 44 specimens of this well-known medusa were preserved. One of the specimens is very 

 small, 3 mm. in diameter, and unfortunately it is badly preserved. The others range in size between 

 7 mm. and 24 mm. in diameter. As a rule the jelly is very firm. 



The sizes of the preserved specimens in the different months of the year are as follows : 



Month Sept. Oct. Nov. Dec. Jan. Feb. April 



Diam. (mm.) 11-17 12 10-24 7 18 21 9-23 



These figures do not show any definite relation between the season and the size of the medusae. 



Most of the localities are in the Atlantic sector, fairly evenly distributed between about 22° E and 

 45° W, in a belt between 48° and 56° S. St. WS 385 and St. 382 are in the neighbourhood of the South 

 Shetlands. Stns 958 and 1458 are in the Pacific sector, between about 62° and 66° S. 



Distribution. Antarctic and sub-antarctic, circumpolar; previously recorded from Cape Adare 

 (Browne); between Bouvet Island and Enderby Land and north-west of Gauss Station (Vanhoffen). 



Calycopsis bigelowi Vanhoffen 191 1 

 (Text-fig. 4) 



191 1 Calycopsis bigelozvi Vanhofien, p. 218. Text-fig. 12. 



1918 Calycopsis bigelowi Bigelow, p. 377. 



1940 Calycopsis bigelowi Bigelow, p. 293. 



Occurrence: St. 100. 2-4. x. 26. 33° 20' S, 15° 18' E to 33° 46' S, 15° 08' E. Net: TYF 475(-o) m. i specimen. 



TYF 2500-2000 m. I specimen. 

 St. loi. 15. X. 26. 33° 50' S, 16° 04' E to 34° 13' S, 15° 49' E. Net: N 450 3so-40o(-o) m. 2 specimens. N 450 V 



850-950 m. I specimen. 

 These localities are west of the Cape of Good Hope. A specimen belonging to the same species is 

 labelled as follows: St. 983. 23. x. 32. 55° 10' S, 76° 04' 42" W. Net: N 100 B 300-80 m. This is 

 very peculiar. The locality is west of the south point of South America, and the haul was made in 

 the upper water-layers, whereas in the other localities the specimens were taken at considerable 

 depths. I cannot suppress a suspicion that some mistake may have taken place. 



According to the revision of the genus Calycopsis carried out by Bigelow (1913, 1918, 1940), the 

 present specimens must be referred to C. bigelowi, and as a matter of fact they agree quite well with 

 the description and figure given by Vanhoffen of this medusa, which was taken in the Gulf of Aden. 

 In spite of the very considerable geographical range, I am convinced that they belong to the same 

 species. At any rate, they are quite different from C. borchgrevinki. They vary in diameter from 7 mm. 

 to 16 mm. (Vanhoffen's specimen was 13 mm. wide), the gonads are similar in structure to C. bigeloici. 

 A specimen 9 mm. in diameter has about 32 tentacles; the largest specimen, 16 mm. high and wide, 

 has about 48 tentacles of different sizes, some of them quite small; thus, in this respect also, the speci- 

 mens agree with Vanhoffen's statements. I may add that the jelly is remarkably soft and adhesive, 

 more or less covered by adhering particles of dirt. In all the specimens the gonads have a characteristic 

 yellow-green colour. In some of the specimens, several peculiar projecting lobes are seen between 

 the folds of the gonads, exactly like those observed in C. typa by Bigelow (1909, p. 208, Sibogita nuar- 

 chus) ; he was able to state after cutting sections that 'such lobes are nothing more than regions of the 

 sexual organ which have made an irregular growth outwards '. 



Distribution. Previously recorded from the Gulf of Aden, 13° 02-8' N, 46° 41-6' E, in deep water. 

 Now taken west of Cape of Good Hope, also in deep and intermediate water-layers. 



