FOEAMINIFEEA OF THE KEEIMBA AECHIPELAGO. 683 



Family ROTALIID.E. 



Subfamily S p ] it i l l i N i >' iE. 



Spieillina Ehrenberg. ' 



324. Spirillina vivipara Ehrenberg. (PI. LI. figs. 19-28.) 



Spirillina viuipara Elireuberg, 1841, SNA. p. 442, pi. iii. fig. 41. 



Parker & Jones, 1865. NAAF. p. 397, pi. xv. fig. 28. 

 Mobius, 1880, FM. p. 88, pi. viii. figs. 1, 2. 

 Brady, 1884, FC. p. 630, pi. kxxv. figs. 1-5. 

 Egger, 1893, PG. p. 394, pi. xviii. figs. 5G-58. 

 „ „ [Arspirillinum vu-viviparum m.\ 1) Rhumbler, 1908, etc., FPE. 1913, p. 428, 



text-fig. 142, pi. V. fig. 9; pi. vi. figs. 4-9. 

 • „ „ Herou-Allen & Earland, 1913, CI. p. 107, pi. ix. fig. 1. 



15 Stations. 



Universally distributed, and abundant at some Stns. The specimens comprise 

 practically all the variations of this simple but very mutable species, ranging from 

 extremely complanate forms of the var. complanata Parker & Jones (J. P. & B. 1866, 

 etc., MFC. 1896, p. 290, pi. iii. (1866) figs. 20-22) to comparatively high-domed 

 forms with concave inferior surface. Typical individuals of S. vivipara of a very 

 large size were obtained at Stn. 2 a. Both typical flat forms and the high-domed 

 forms occur in company at most Stns., but at Stns. 3 and 7 only the flat type occurs, 

 and at Stns. 9and'?X only the domed. At Stn. 11 a single specimen (which we 

 figure) was found of a very curious and marked variety with an acute peripheral edge 

 produced into short fiat spines. This has some superficial resemblance to the 

 S. spinigera of Chapman (C. 1899, FFA. p. 10, pi. 1. fig. 7, and C. 1900, FLF. 

 p. 188, pi. xix. figs. 9 & 10), but differs from his figure and description in some 

 minor points, especially in the nature of the primordial portion, the height of the 

 dome, and the development of the spines. At Stns. 1 and 3 individuals were found 

 intermediate between S. vivipara and *S'. cequalis Brady (which we also figure), 

 characterized by massive and coarsely perforate shell-wall, the upper surface being 

 slightly concave and the lower practically plane. 



325. Spirillina obconica Brady. 



Spirillina obconicu Brady, 1879, etc., RRC. 1879, p. 379, pi. viii. fig. 27. 

 Brady, 1884, FC. p. 630, pi. Ixxxv. figs. 6, 7. 

 „ Egger, 1893, FG. p. 395, pi. xviii. figs. 59-61. 

 „ Chapman, 1909, SNZ. p. 352. 

 „ Heron-Allen & Earland, 1913, CI. p. 108, pl. ix. figs. 8, 9. 



1 Station. 



One typical specimen. 



