646 MESSRS. E. HERON-ALLEN AND A. EAELAND ON THE 



14 Stations. 



Occurs at all Stns. except 5, 9, and 12, never abundantly, but generally very fine. 

 The best specimens are from Stns. 1, 2 b, and 11 : at Stn. 11, in addition to the normal 

 type, specimens occur in which the early chambers are costate, and one individual in 

 which the whole surface of the test is covered with raised and contorted lines of shell- 

 substance. 



221. Bolivina robusta Brady. 



BoUvina robusta Brady, 1879, etc., RRC. 1881, p. 57. 



„ Brady, 1884, FC. p. 421, pi. liii. figs. 7-9. 

 „ E-ger, 1893, FG. p. 294, pi. viii. figs. 31-32. 

 „ Millett, 1898, etc., FM. 1900, p. 543. 



15 Stations. 



Universally distributed, often in considerable numbers, and very variable in size and 

 the solidarity of the test. Two forms are noticeable : one a broadly diamond-shaped 

 form, very thick in the median line ; the other a smaller and much narrower form, 

 though equally thick in proportion. The two forms occur together, noticeably at 

 Stns. 10 and 12, where they are both equally common, in varying proportions at the 

 other Stns. except at Stn. 11 where only the large form occurs, and in its maximum 

 development. No spinous specimens have been observed, and there is little variation 

 in the appearance of the shell, otherwise than in the extent of limbation of the sutures, 

 but at Stn. 2 a a few coarsely punctate individuals were observed. One specimen was 

 observed in which the initial chambers projected sideways in a spiroplectine curve. 



222. Bolivina limbata Brady. (PL L. figs. 1-4.) 



Bolivina limbata Brady, 1879, etc., RRC. 1881, p. 57. 



Brady, 1884, FC. p. 419, pi. Hi. figs. 26-28. 



Egger, 1893, FG. p. 300, pi. viii. figs. 10-12 (11-13 in text). 



Chapman, 1900, FLF. p. 187 ; and 1901, FFA. p. 409 (Bifarina limbata), 



pi. xxxvi. fig. 12. 

 Heron-Allen & Earland, 1913, CI. p. G7, pi. v. figs. 2, 3. 



12 Stations. 



Very generally distributed, often abundant. The species reaches its maximum 

 development in size and beauty at Stn. 11, the specimens being characterized by a 

 tendency to a bifarine arrangement of the later chambers even more pronounced than 

 in Brady's types and Chapman's 1901 figures. At Stn. 11 and also at Stn. 1 some 

 of the individuals exhibit prominent punctation which tends to an arrangement 

 in parallel lines, giving a pseudo-sulcate appearance to the surface of the test. 

 At Stn. o truly costate specimens occur. At Stn. ■? X a single individual was observed 

 of abnormally compressed form. 



