CORNUCOPINA 397 



5. Projecting part of zooecium narrow proximally, with a long tubular part and short opesia, 



ovicells very shallow, trumpet-shaped avicularia without bulbous swelling proximally 



2. C. conica 

 Projecting part of zooecium broad proximally, with opesia occupying nearly its whole length, 

 ovicells well rounded, trumpet-shaped, avicularia with bulbous swelling proximally 



1. C. pectogemma 



6. Outer distal corner forming a spine-bearing process 7 



No spine-bearing process ... ... ... ... ... ... ... ... ... 8 



7. Spines fairly evenly distributed on spine-bearing process, opesia angular and extending 



towards base of daughter-zooecium, cryptocyst present 10. C. angulata 



Two or three spines at tip of spine-bearing process and two others unevenly spaced along it, 

 opesia oval, not extending towards daughter-zooecium, cryptocyst absent 



11. C. rotundata 



8. Cryptocyst present, avicularia attached rigidly n 



Cryptocyst absent, avicularia attached flexibly ... ... ... ... ... e. C. lata 



9. Aperture oval, turned almost at right angles to axis of branch 6. C. ovalis 



Aperture more or less triangular, not turned from axis 8. C. zelandica 



1. Cornucopina pectogemma (Goldstein). Figs. 28 C, 32 C. 



Bicellaria pectogemma Goldstein, 1882, p. 42, pi. i, figs. 2, 2 A; Busk, 1884, p. 33, pi. vii, fig. 1 ; 

 Kluge, 1914, p. 637. 



Cornucopina pectogemma Harmer, 1926, p. 422; Hasenbank, 1932, p. 338, text-fig. 12 A-D. 



Station distribution. Sub- Antarctic : South Atlantic Ocean, St. 6. Antarctic: Weddell Quadrant, 

 Sts. 42, 175, 363, WS 27, WS 33, WS 42. 



Geographical distribution. Tristan da Cunha (Discovery) ; Marion Island (Goldstein) ; Prince 

 Edward Island; Heard Island (Busk); Bouvet Island (Hasenbank); South Georgia; South Sandwich 

 Islands; South Shetland Islands (Discovery); Wilhelm II Land (Kluge); Oates Land; Ross Sea 

 (Terra Nova). 



Kluge and Hasenbank both refer to the widening of the tube of the trumpet-shaped 

 avicularium near its base (Hasenbank, text-fig. 12 C). This little bulbous swelling is 

 constantly present in my specimens and in the type. A transverse septum is usually to 

 be seen near the base of the bulb (Fig. 32 C). Hasenbank (text-fig. 13 A, D) showed a 

 similar swelling at the base of an avicularium of Cornucopina moluccensis, but it is only 

 occasionally present in that species, the constant feature being the eminence (Fig. 32 A) 

 to which the avicularium is attached, which is absent in C. pectogemma. 



The avicularia vary considerably within the colony, both in length and in size of 

 head, but some colonies consistently show certain peculiarities. The avicularia are 

 stouter and rather shorter, on the average, in that from the South Shetland Islands 

 (St. 175); and conspicuously long and slender, though often large-headed, in the 

 specimen from Tristan (St. 6). The specimen from the South Shetlands has shorter 

 zooecia than most, with the distal part less divergent from the axis of the branch, but 

 similar zooecia are also to be seen in one of the specimens from South Georgia (St. WS 



D XXII I3 



