. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. CABEREA 387 of the zooecia and vibracula, in the number of spines, and in the keeled frontal surface of the fertile branches, this variety resembles the Antarctic form of C. darwinii. It differs in the small size of all the frontal avicularia except those on the median zooecia at the bifurcations, and in the large size and characteristic shape of these median avicularia. In the Antarctic form the avicularium on the median zooecium may be larger than the other frontal avicularia, but all are more
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. CABEREA 387 of the zooecia and vibracula, in the number of spines, and in the keeled frontal surface of the fertile branches, this variety resembles the Antarctic form of C. darwinii. It differs in the small size of all the frontal avicularia except those on the median zooecia at the bifurcations, and in the large size and characteristic shape of these median avicularia. In the Antarctic form the avicularium on the median zooecium may be larger than the other frontal avicularia, but all are more or less enlarged and of similar shape so that there is not the marked contrast that is found in this variety (cf. Fig. 24 A, B). Coming from the region of the Falkland Islands and showing so many of the charac- teristics of the Antarctic type var. guntheri seems at first sight to disagree with the distri- bution of C. darwinii as summarized on p. 383. The stations at which the variety replaced. 0 -5mm Fig. 24. A. Caberea darwinii Busk, Antarctic type. National Antarctic Expedition, McMurdo Sound. B. C. darwinii var. guntheri St. WS 840, between Burdwood Bank and Patagonian Shelf. Both drawings show the zooecia immediately preceding a bifurcation. In Fig. B the scutum of the median zooecium is broken, and the granulation of the cryptocyst has been omitted from all but one of the zooecia. c. cryptocyst, mdb. mandible, op. operculum (open), sp. spine, v. vibraculum. the typical form are, however, the deepest from which Polyzoa were obtained in the Patagonian region, and there is some reason to think that they are influenced by Antarctic conditions (see p. 486). The form from Juan Fernandez figured by Marcus (19210:, p. 98, text-fig. la) as C. rostrata (see p. 390 below) also has a giant avicularium before the bifurcation, with the chamber spreading proximally, but with a longer mandible, and no pointed prolongation of the chamber. Spines are more numerous than in var. gunt
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