74 "TEHRA NOVA" EXPEDITION. 



illustr;ited by Brady (pi. xi. fig. 5) in which there is an iiniuense increase in tiie wirltli 

 of the final convolution. Kepresented in the N.Z. area by the wide-tubed type 

 attaining comparatively enoriuous dimensions: one broken shell probably exceeded 

 a cpuirtei' of an inch in diameter. Only the narrow-tubed type occurs in the 

 Antarctic material. Init at Station 2fi this also reaches a very large size. 



[Arenaceous isomorph, Avimodiscus tenuis, Brady, Hyaline isomorph, Spirillina 

 vivipara, Ehbg., evolute forms.] 



62. Corimspira sdseyensis, Heron-Allen and Earland. 



Cornmpim (?) Earland. 190.5, FBS. p. 199. i)l. -xiii. figs. 2-4. 



aeheyeuMf:. Heron-Allen and Earland, 1914, etc., FKA. 191.'5. p. 592. 



Stations 4, 6, 26, 31, 38, 45, 46, 48, 53-55. 



Occurs in both areas, but much more frequently in the Antarctic. It is 

 entirely missing at all the deep-water Stations. The specimens even from the 

 most southerly latitudes differ in no respect from the original English types. 

 Station 31 (268 fms.) is perhaps distinctive in the exhibition of tests more 

 stoutlv constructed than is usually the case. 



63. Corimspira mvolvens (Reuss). 



Opcrcvlina involvens, Reuss, 1849-50, POT. p. .370, pi. i (xlvi), fig. 20 (not 30). 

 ConiHspira „ Heron-Allen and Earland, 1914, etc., FKA. 1915, p. 593. 



Stations 3. 5. 6. 10, 26, 31, 38, 46, 48, 50,53-55 (-hK. T.,D.). 



Occurs in both megalospheric and microspheric forms, both together at 

 Stations 38 and 48, the microspheric alone at Stations 3, 5, 6 and 31, the 

 megalospheric alone at Stations 10, 26, 46, 50, 53. 54 and 55, at all of which 

 Stations specimens attain fine dimensions, the largest at Station 26. For its 

 remarkable occurrence at Station 10, see our note on Hyperoninina ramosa (No. 91). 



[Arenaceous isomorph, Ammodiscus incerins (d'Orb.), Hyaline isomorph, Spiril- 

 lina vivipara, Ehbg., closely coiled forms.] 



64. Corimspira diffusa, Heron-Allen & Earland. 



Cornuspira diffusa, Heron-Allen and Earland, 1912, etc., NSG. 1913, No. 3, pj). 272-276, 

 1^1. xii. ; 1913, CI. p. 37 ; 1916, FWS. p. 217. 



Station 6. 



This interesting form is quite one of the most typical Foraminifera at this Station , 

 where it occurs in abundance and is characterized by the wildest out-growths. No 

 individuals Avere found exhibiting a-ny trace of the spiral centre observed in our type 

 specimens: some of them, indeed, show a closed extremity to the initial portion, 

 whilst in others the initial extremity is narrowed down to a cup-like opening 

 suggestive of a sessile liabit. Jt would thus appear to link Cornusfira with 

 Nuhecularia. 



