208 "TERRA NOVA" EXPEDITION'. 



subsidiary aperture.s. there is no evidence to show — prolialily the former. Ju 

 the NZ. area the species is much less abunckmt and less strongly developed than 

 in the Antarctic, but good specimens are found at several Stations, notably 

 Station 6. where also a very handsome cultrate. high-domed type occurs with a 

 thick, glassy shell. At Station 48 occurred a large specimen. '80 mm. in diameter, 

 which we figure (pi. VII, fig. 24), with the terminal chamber broken autl revealing 

 a number of viviparous yoimg in the cavity. 



550. Truncatulina lohatula (Walker and Jacob). 



Nautilus lobatidus, Walker and Jacob. 1798, AEM. p. 6-12, pi. ,xiv, fig. 36. 

 Truncatulina lohatula, Heron-Allen and Earland, 1914, etc., FKA. 191.5, p. 706. 



Stations 1-6. 8-12. IG-li). 23. 26, 27, 29, 31, 38, 45, 47, 48, 50, 53 (+K. I., 

 E.d. J., I),). 



. Universally distributed, and, except in the deep water, abundant. Every 

 possible variation, including sessile and encrusted specimens at Station 6, one 

 snuiU individual having become encrusted within the arms of a large Tetractinellid 

 sponge-spicule. At a few Stations (8, 9, 26, 29, 31 and 38) the species is character- 

 ized by its minute size, for no apparent reason, otherwise the species is constant 

 in maxinmm size to the farthest South. Some of the licst and most strongly 

 built specimens are from Stations between 45 and 50. At Station 11 a specimen 

 with an extremely jninute individual encru.sted upon the centre of the flat side. 



[Arenaceous isomorph, ?\ ubeculariu lucifiuja, Defr., see note to No. 4. J 



551. Truncatulina lobatuhi, var. arencu-ca. nov. I'l. VII, figs. 32-35. 



Stations 26. 45. 



At Station 26 small neat arenaceous isomorphs, comparalilc in size and 

 development with the hyaline type, as occurring at this Station. One sessile, 

 and one free individual. The test is neatly constructed of fine sand-grains and 

 ferruginous cement. One less typical example at Station 45. 



The size is very varial)le : a typical specimen was "40 mm. long and "30 mm. 

 broad. 



552. Tninratidina varkibilis. d'Orljigny. 



TiNiicdlidiiKi rariabilix, d'Orbigny, 1826, TMC. p. 279, no. 8. 



Heron-Allen and Earland, 1914, etc., FKA. 191.5. p. 706. 



Stations 2-4, 6, 12, 16, 18, 19, 50, 55 (+R. d. J., D.). 



Abundant do\\ai to Station 6. At the other Stations represented, as a rule, 

 by single individuals presenting no particular features. At Station 19 very thin 

 and outspread, at Station 50 an individual of a very massive and thick-walled 

 type, probably derived from T. refulgens rather than from T. lohatula. The N.Z. 

 specmiens are more noteworthy : it occurs both recent and fossil at Stations 2, 3 

 and 6, and the fossil specimens are perhaps the most interesting series ; they 



