FOIJAMINIFEK A— HERON- ALIEN AND EARL AND. ■ 87 



mud for building purposes on the precise spot where a young brood of C. involvens 

 had just been hatched out. The record of the species at this Station rests 

 entirely on these individuals. 



92. Hyperainmina urborescens, Norman. 



Psammatodendron arhorescens (Norman MS.), Brady, 1881, HNPE. p. 98, No. 13. 

 Hyperammina „ Brady, 1884, FC. p. 262, pi. xxviii, figs. 12, 13 (fig. 10, p. 263). 



Station 48. 



A single recognisable branching fragment. 



93. Hiipemmmina elongatu, Brady. PL I, tig. 21. 



HyperaiiimiiHt clongata, Brady, 1878, RRNP. p. 433, pi. xx, fig. 2a, h. 



Ciishman, 1910, etc.. FNP. 1910, p. 60, fig.s. 73, 74. 



Stations 6, 22, 26, 27, 37, 41, 52, 55 (+ D.). 



Two distinct types of structure occur among the specimens referable to this 

 species. The normal, in which the test is l)uilt uj) of sand-grains firmly cemented 

 together and with more cement than is fomid in any other species of Hyper- 

 ammina ; the outer siuface is at times quite rough, at others smoothly agglutinated. 

 The other type utilises spicules, sometimes in part, and sometimes in toto, in the 

 construction of its test, and occasionally these spicules are arranged in two distinct 

 layers set longitudmally and transversely with a neatness equal to that dis- 

 played by Teehnitella {Cf. H.-A. & E., 1912, etc. NSG. 1912, p. 382, pi. v, 

 figs. 1. 2). At Station 6, where the species is most abundant, both types occur, 

 and the spechnens also fall into two distinct groups in each type — a long, narrow 

 tube agreeing with Brady's figures, and a short and much more massively built 

 organism, which at times evidently attains a considerable size. The arenaceous 

 type occurs alone at Stations 26, 27, 37. and 41, all of the small and slender 

 type. At Stations 52 and 55 the spiculiferous type occurs alone, but using sand- 

 grains in about equal proportions to the spicules. 



This spiculiferous habit, although more predommant among the N.Z. speci- 

 mens than we have observed elsewhere, is not confined to the N.Z. area ; we 

 have identical specimens from several deep-water Stations round the British 

 coast, and it may l)e noted with interest that Brady's type-slide of the species 

 in the British Museum contains a similar specimen, although he makes no refer- 

 ence to the habit in his published description. This spiculiferous habit extends to all 

 the other species of Hypcrahunina. notably to H. ramosa, which invariably uses 

 spicules if they are attainable. H. mestayeri, Cushman (C. 1919, RFNZ. p. 596, 

 pi. Ixxiv, fig. 3) from the N.Z. area — which the author states is evidently related 

 to H. friabilis, Brady — no doubt occupies the same position with regard to 

 that species that our spicidar variety of H. eloiu/ata does to the normal 

 type, and the habit is not confined to the N.Z. area, as we have spicular 



