rOEAMINIFEEA OF THE KERIMBA AECHIPELAGO. 647 



223. Bolivina lobata Brady. 



Bolivina lobata Brady, 1879, etc., RRC. 1881, p. 58. 



Brady, 1884, FC. p. 425, pi. liii. figs. 22, 23. 

 „ Egger, 1893, FG. p. 300, pi. viii. f^gs. 55, 56. 



„ Millett, 1898, etc., FM. 1900, p. 543, pi. \. fig. 4 {Bk/enerma fimbriata). 

 „ Cushman, 1910, etc., PNP. 1911, p. 46, figs. 74, 75." 



15 Stations. 



Occurs practically everywhere, very often common. While constant to type, the 

 specimens present a certain amount of variation in minor features. As a rule, the 

 entire surface of the chambers is rough, owing to the presence of innumerable pro- 

 jecting points. But many specimens, notably at 'Stn. 4, have a smooth and hyaline 

 surface at the basal portion of each chamber, the roughness being confined to the 

 superior half. At other Stns. (notably Stns. 2 b, 10, and 11) the aculeate growths fuse 

 and form reticulating costse over the surface of the chambers. The species reaches its 

 best development as regards size and ornament at Stns. 1 and 11. 



224. Bolivina convallaria Millett. 



Bolivina convallaria Millett, 1898, etc., FM. 1900, p. 544, pi. iv. fig. 6. 



I Station. 



One specimen from Stn. 12, which is of a type in which the sides of the test are 

 regularly parallel for at least three-quarters of the length of the shell. Millett's 

 type, as figured, represents the later pairs of chambers as separated by varying spaces, 

 but in the Kerimba specimens the spacing is uniform over the greater portion of the 

 shell. Millett refers to the variability of the species as regards the form and 

 arrangement of the chambers, and perhaps his figure represents an extreme type. The 

 species occurs at several Stns. in Millett's Malay gatherings " by no means common." 

 We have met with it at Singapore, in the Macassar Straits, and in many PaciHc 

 shallow-water gatherings — notably at Tahiti, where it is common. All of the speci- 

 mens which we have seen are of a very regular type, similar to the Kerimba 

 shell, and presenting very little variation except in the development of the marginal 

 spines. 



225. Bolivina variabilis (Williamson). 



Textularia variabilis {typica) Williamson, 1858, RFGB. p. 7Q, pi. vi. figs. 162, 163 (incorrectly 



numbered 161, 162 on the plate). 

 Bolivina variabilis Chaster, 1892, CS. pp. 59, 69. 



„ „ Heron-Allen & Earland, 1908, etc , SB. 1909, p. 336. 



„ „ Herou-Allen & Earland, 1913, CI. p. 68. 



II Stations. 



Occurs at many Stns., never in any numbers. The specimens exhibit a considerable 

 VOL. XX. — PAKT XVII. No. l4:.—]Sov€mber, 1915. 4 y 



