126 ■'TERRA NOVA' EXPEDITION. 



CLAVULINA, crOrbignv. 



210. Clavulina communis, d'Orbigny. 



Clavulina communis, d'Orbigny, 1826, TMC. p. 268, uo. 4. 



Heron-Allen and Earland, 1914, etc., FKA. 1915, p. 636, pi. xlviii, 

 figs. 15-17. 



Stations 2, 3, 6, 7, 8, 10-12, 16-18, 22, 28, 33-35, 42. 



A series of specimens of this species ofi'er an interesting illustration of the 

 influence of environment on external form. Xo tyro, confronted with specimens 

 from Station 3 and any of the deep-water Stations to the south, would imagiue 

 that the same organism was responsible for both. In the shallow water of the 

 X.Z. area as far as Station 6, where the sand is comparatively coarse, the animal 

 constructs a stout, short cylindrical test, broad iii proportion to its length. As 

 the water deepens and the size of the muieral grains becomes smaller, the test 

 becomes longer, narrower, smoother in construction, until in the deepest water 

 Stations, where it occurs, the test is practically cylindrical without external sign 

 of the clavuline initial chambers ; perfectly smooth owing to the fineness of the 

 constituent material, and only recognizable externally by the projecting tubular 

 aperture. Some of these deep-water specimens attain a great size, unbroken 

 specimens 4-5 mm. long were foimd at Stations 10 and 11, and at Station 16 

 fragments indicatmg specimens which must have been three times that size. 



211. Clavulina obscura, Chaster. 



Verneuilina polystropha (Reuss). "' dimorplious form," Wriglit, 1885-6, BLP. p. 320, pi. .xxvi, 



fig. 2. 

 Clavulina obscura, Heron-Allen and Earland, 1914, etc., FKA. 1915, p. 63G. 



Stations 6, 55. 



A single specmien at each Station referable to this obscure species. 



212. Clavulina parisiensis, d'Orbigny. 



Claculina jiarisiensis, d'Orbigny, 1826, TMC. p. 268, no. 3, ModMe no. 66. 



Cusliman, 1910, etc., FNP. 1911, p. 75, figs. 123, 124. 



Station 53 (-f R.d. J.). 



One very small but typical specimen. Its occurrence in such a southern 

 latitude is noteworthy. 



213. Clavulina cylindrica, Hantken. 



Clavuliiia cyliiidricn. Hantken, 1875, CSS. p. 18, pi. i, fig. 8. 



Heron-Allen and Earland, 1914, etc., FKA. 1915, p. 636. pi. xlviii. 

 figs. 18, 19, 



Stations 3, 6, 10, 11 (-I-R. d. J.). 



Confined to the N.Z. area and reachmg its maximum development at Station 

 6, where it occurs in every conceivable variety, from almost spherical to cylin- 



