CABEREA 37i 



the median one at a bifurcation which may be slightly enlarged. The enlarged marginal 

 avicularia are of similar shape in the two species, but are rare and only slightly enlarged 

 in C. helicina, whereas in C. zelandica they are numerous and may be very large (Fig. 

 20 D). The proximal lobe of the scutum is usually reduced in C. zelandica, though 

 specimens in which some scuta are like those of C. helicina in this respect are found 

 (e.g. 99.7.1.884 and 1938.5.2. 15). The two small colonies of C. zelandica from St. 

 TN 144 show that the first-formed zooecia of the colony also have scuta of this type. 

 The difference in the position of the bridge of the vibraculum which appears in 

 Fig. 20 A, B is not constant. 



Marcus (192 ib, p. 91) regarded the form here identified with C. zelandica as the aged 

 state of C. darwinii (in which he included C. helicina), but the pronounced difference 

 between well-developed, fertile colonies of C. zelandica and C. helicina shows clearly 

 that the relationship is not an age succession. 



Marcus mentioned specimens from South-west Australia, Port Jackson, New Zealand 

 and Carnley Harbour, Auckland Islands, as agreeing very closely with MacGillivray's 

 description. As I have examined the material from Carnley Harbour and do not regard 

 it as belonging to C. helicina (see p. 379 below) I have not included any of these records 

 in my statement of the distribution of C. helicina. 



3. Caberea zelandica (Gray). Plate VI, fig. 5; Fig. 20 B-D. 

 Selbia zelandica Gray, 1843, p. 292. 



Caberea boryi (part) Busk, 1852&, p. 39, pi. xvi, figs. 4, 5 (C. zelanica on plate), 

 not Caberea zelanica Busk, 1852a, p. 378 (fide Busk). 

 Caberea lyallii Busk, 1884, p. 29 (nom.n. for Selbia zelanica [sic] Gray). 

 ? Caberea lyallii Hutton, 1891, p. 103; Hamilton, 1898, p. 194; Hutton, 1904, p. 295. 

 ? Caberea boryi (part) Hutton, 1873, p. 91. 



Caberea darwinii (part) Marcus, 19216, pi. v, fig. la (not C. darioinii Busk). 

 Caberea darwinii Marcus, 1921a, p. 96. 

 Station distribution. New Zealand: St. 929. 



Geographical distribution. Specimens in British Museum: Auckland, New Zealand (Sinclair, 

 33. 3. 10. 1 ; Busk Coll. as C. boryi, 1938. 8.1 2.1); New Zealand (5 1.7. 4. 29 -,75. 1.5. 74; 90.5.27.72; 

 1934.10.24.31,32; 1938. 5. 2. 15; Busk Coll. as C. lyallii, 99. 7.1. 881, 885; Busk Coll. as C. lyallii 

 from B.Mus., 99.7.1.886; Busk Coll. as C. zelanica (boryi), 99.7.1.6549; Busk Coll. as C. lyallii 

 from Lyell, 99 . 7 . 1 . 884, 889 ; Busk Coll. as C. boryi from Lyell, 1938 .8.12.2; Busk Coll. as C. boryi 

 from Colenso, 99. 7.1. 6612; Hincks Coll. 99.5.1.385, 391; St. 929, Discovery). Otago, New 

 Zealand (Hincks Coll. 99. 5.1. 193). Palliser Bay, Wairarapa, New Zealand (90.5.27.74, 76, 100). 

 Challenger St. 167, New Zealand (as C. rostrata, 87. 12.9. 129, and Busk Coll. 99. 7.1. 891). Cape 

 Maria van Diemen (St. TN 144). 



Specimens in other collections: New Zealand, I 88; Auckland, New Zealand, I 90 (slides lent by 

 Dr Marcus). Masatierra, Juan Fernandez Islands, 28.3.1917, SPE 723, 30-45 m. and SPE 390 

 20-35 m. (Riksmuseum Stockholm 646, 645; also the specimen, 186, figured by Marcus, 1921, 

 pi. v, fig. 1 a, lent by Dr Marcus). 



Description. Colony thick, bushy (Plate VI, fig. 5), branching and joints typical of 



the genus. 



