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 CORNUCOPINA 399 



3. Cornucopina infundibulata (Busk). Fig. 28 B. 



Bicellaria infundibulata (part) Busk, 1884, p. 33, pi. vi, figs. 2, 2 a-d. 



Cornucopina infundibulata Levinsen, 1909, pi. iv, fig. 4 a-d; Harmer, 1923, p. 306; 1926, p. 429. 

 Station distribution. Not represented in the Discovery collections. 

 Geographical distribution. South Indian and Southern Oceans, 2516-3614111. (Busk). 

 A specimen in the British Museum (90.4.14.4) comes from Challenger St. 146, a 

 station from which no Polyzoa were described by Busk although their presence in the 

 trawl is mentioned by Murray (1895, p. 448). Harmer discusses the relationship of this 

 species to C. polymorpha and C. conica (see below, under C. polymorpha). 



4. Cornucopina polymorpha (Kluge). Plate VII, fig. 3 ; Fig. 28 A, D. 



Bicellaria polymorpha Kluge, 1914, p. 638, pi. xxx, fig. 1. 

 Cornucopina polymorpha Harmer, 1926, p. 422. 

 ? Bicellaria dubitata Calvet, 1909, p. 5, pi. i, figs. 1, 2. 

 ? Cornucopina dubitata Harmer, 1926, p. 422. 



Station distribution. Antarctic: Weddell Quadrant, Sts. 148, 175, 181, 190, 366, WS 27, WS 33 ; 

 Victoria Quadrant, Sts. 1652, 1658, 1660. 



Geographical distribution. South Georgia (Discovery; Shackleton-Rowett Expedition); 

 South Sandwich Islands; South Shetland Islands; Palmer Archipelago (Discovery); Bellingshausen 

 Sea? (Calvet); Wilhelm II Land (Kluge); Oates Land; Ross Sea (Terra Nova; Discovery). 



Among the small branches at his disposal Kluge did not find any which possessed 

 gonozooecia together with both kinds of avicularia. His composite figure showing all 

 these structures on a single branch is justified by the more abundant material collected 

 by the ' Discovery '. 



A few specimens have a third type of avicularium (Fig. 28 D). These, like the trumpet- 

 shaped avicularia, are attached to the basal surface of the zooecia distally and near the 

 middle of the branch. They are as long as the zooecia, or longer, and consist of a slender 

 stalk, and a sharply demarcated head, which is about twice the length of the stalk. The 

 beak is curved. The mandible is nearly as long as the head and is acutely pointed. In 

 shape and position these avicularia resemble the basal ones of Cornucopina infundibulata 

 but they are very much bigger (cf. Fig. 28 B and D), the beak is more hooked, and the 

 stalk is more sharply marked off. 



In most of the specimens in which this stalked type of avicularium was found the 

 trumpet-shaped avicularia are exceptionally long, their length ranging from 2-2 to 

 4 mm., in contrast to the more typical 1-2 mm., but in the material from St. 1660 the 

 stalked avicularia were found on branches some of whose trumpet-shaped avicularia 

 measured as little as 1-2 mm. Other specimens with stalked avicularia came from 

 St. 148 (South Georgia) and St. 366 (South Sandwich Islands). The longest trumpet- 

 shaped avicularia were found in the colony from the Palmer Archipelago (St. 181). 



C. infundibulata and C. polymorpha both have long trumpet-shaped avicularia at- 

 tached to the basal surface more or less in line with the spines, but nearer the axis of the 

 branch, and stalked basal avicularia placed close to the axis of the branch. The stalked 



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