MENIPEA 335 



p. 358). A specimen of Menipea patagonica from Swain's Bay, Kerguelen (Busk Col- 

 lection, 99.7. 1 .715) does, however, show the ancestrula (Fig. 6 A). It is taller than that 

 of Tricellaria aculeata and attached by its tubular tip. The first internode is separated 

 from it by a joint, and consists of seven zooecia, of which the first two have five 

 spines arranged along the outer and distal borders of the rather short opesia and one 

 on the inner border. The other five zooecia have successively fewer spines and a longer 

 opesia. The succeeding internodes are typical. In two colonies from the Falkland 

 Islands lent by the U.S. National Museum the first few zooecia are similar to those just 

 described, but the assumption of typical characters is more gradual, so that several 

 internodes consist of rather shorter zooecia with more than the usual number of spines. 

 The ancestrula has broken away in both. 



3. Menipea fiagellifera Busk. Figs. 6 B, C, 7 C. 



Menipea fiagellifera Busk, 1884, p. 21, pi. iv, fig. 1; Calvet, 1904, p. 6; Harmer, 1923, p. 343. 



Scrupocellaria fiagellifera Kluge, 1914, p. 615, text-fig. 5. 



Station distribution. Sub- Antarctic: South Atlantic Ocean, Sts. WS 79, WS81, WS 82, 

 WS 84, WS 85, WS 87, WS 88, WS 220, WS 225, WS 228, WS 231, WS 237, WS 239, WS 243, 

 WS 244, WS 245, WS 246, WS 824, WS 838, WS 871; South Indian Ocean, Sts. 1562, 1563, 

 1564. 



Geographical distribution. Patagonian Shelf (Busk; Calvet; Discovery); off Patagonian Shelf, 

 down to 339 m. (Discovery); Marion Island (Busk; Discovery); Prince Edward Island (Discovery); 

 Kerguelen (Busk; Kluge). 



The setiform mandible of the frontal avicularium has a thickened base, which would 

 be more or less triangular in cross-section, and has its corners drawn out to form 

 massive condyles (Fig. 6 B). The divaricator and occlusor muscles appear to be un- 

 paired and are attached to opposite surfaces of the mandible, medianly and at a little 

 distance from its base, the tendon of the occlusor muscle passing between the condyles. 

 The setiform mandible with its massive condyles gives this heterozooecium a strong 

 superficial resemblance to a vibraculum, but it appears to be almost symmetrical in 

 structure (the condyles differ a little in shape), and to have only a symmetrical 

 two-way movement of the mandible, and is therefore, as Harmer also concluded, an 

 avicularium. 



Fertile zooecia are to be seen in material collected at St. 1564 (Prince Edward 

 Island, 7 April 1935), but are not numerous. The embryo occupks a large sac in the 

 body-cavity and the ovicell is represented by a small cap at the distal end of the 

 zooecium, the cryptocyst being interrupted at this point (Fig. 7 C). 



There are ancestrulae of this species from Sts. 1563 and 1564 (Marion and Prince 

 Edward Islands, 7 April 1935). The ancestrula is of the " vase-shaped " type with oblique 

 distal opesia surrounded by spines. It is chiefly remarkable for the length of its stalk-like 

 proximal part (Fig. 6C). The suggestion of a joint in this part in the figured specimen 

 is due to an accidental kink. The ancestrula is attached by a small disk. The charac- 

 teristic frontal vibraculum is present on the first zooecium budded from the ancestrula. 



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