138 "TERRA NOVA" EXPEDITION. 



264. Cassululinu crassa, cVOrbiguy. 



Cassidulina crassa. d'Orbigny, 1839, FAM. ]>. 56. iil. vii, figs. 18-20. 



Heron-Allen and Earland. 1911, etc., FKA. 1915, p. 652. 



Stations 1-3. 5-11. 19, 20, 26, 27. 31, 35. 38, 45-50, 53-55 (+ K. I., E. d. J., D.). 



Almost universally distributed, and increasing in size and abundance to tlie 

 South. At the most southerly Stations it reaches an almost unprecedented 

 development in size and thickness of shell, the substance being evidently deposited 

 ill layers, as dead specimens show exfoliation of the surface. At Station 3 a double 

 specimen. 



265. Cassidulina oblonga, Reuss. 



Cassidulina oblonga, Reuss (non d'Orbigny), 1849-50, EOT. p. 376, pi. iii (xlviii), figs. 5, 6. 

 crassa {pars), Brady, 1884, EC. p. 429. pi. liv, fig. 4 (only). 



Stations 3, 6, 26, 27, 38, 45, 46, 47, 48, 50, 53, 54 (+ D). 



This can onlv be regarded as a modification of the C. crassa type, but it 

 possesses an individuality of its own in the tendency to inflation of chambers 

 and the oblong outluie of the whole test. It occurs in company with C. 

 crassa at many Stations and passage-forms are connnon. As with C. crassa it 

 reaches a maximum development in size at the southerly Stations, the best 

 being at Stations 38, 45 and 54. 



266. Cassidulina subghbosa, Brady. 



Cassididina suhglobom. Bradv. 1879, etc., RRC. 1881, p. 60 ; 1884, FC. p. 430, pi. liv, fig. 17. 

 Heron-Allen and Earland. 1914, etc., FKA. 1915, p. 652. 



Stations 1-8, 10, 11, 16, 18 20, 22, 26, 27, 29-31, 36, 38, 45-50, 52-55 (+ T. d. F., 

 K .1., R. d. J., D.). 



Almost universally distributed, but. unlike C. crassa and oblonga. the form 

 does not show that marked tendency to increase in development to the South. 

 There are a few exceptions at Stations 38, 48 and 54, where individuals of very 

 large size occur, but otherwise the Antarctic C. subghbosa is in no way different 

 from the N.Z., and as a general nde the specimens are not so well developed 

 as at the best N.Z. Station 6. Passage-forms into C. crassa and oblonga are 

 frequent. [Arenaceous isomorph. Cassidulina devonica, Chap., J.R.M.S. 1922, 

 p. 334, pi. viii, fig. 8.] 



267. Cassidulina subghbosa, var. taberculata, nov. PL IV, figs. 36-38. 

 Stations 30, 31 ( 4- D.). 



At these Stations a variety of C. subghbosa, characterized by the ornamentation 

 of all but the last formed chambers, witli minute tubercles of shell-matter, occurred. 

 Decoration of any kind is so rare among the Cassidulinae that this variation, which 

 would pass unnoticed in many other genera, seems worthy of a varietal name in this 

 place. It may be compared with Sidebottom's C. decorata (JQMC, Ser. 2, vol. xi, 



