352 DISCOVERY REPORTS 



increasing rapidly in size and breadth . Sutures thick and distinct , very slightly depressed. 

 Terminal face of final chamber large and flattened, furnished with pleated depressions 

 running from the outer edge to the inner margin, where the aperture is situated in a 

 slight depression. 



Length, 0-24 mm. ; breadth of oral face, o-i8 mm. 



Although only a single specimen was found, it presents such characteristic features as 

 to deserve specific mention. It belongs to the group B. semimido with which, however, 

 it cannot be confused. Its nearest ally is B. oiiriadata Terquem (T. 1882, FEP, p. 115, 

 pi. xii, fig. 14), which, however, is more elongate, has flush sutures and an entirely 

 diff^erent oral face. Terquem's specific name, it may be pointed out, had been antici- 

 pated by Bailey as far back as 1851 for a very different form (B. 1851, SAC, p. 12, pi. O, 

 figs. 25-27). 



Genus Virgulina, d'Orbigny, 1826 



138. Virgulina schreibersiana, Czjzek. 



Virgulina schreibersiana, Czjzek, 1848, FWB, p. 147, pi. xiii, figs. 18-21. 

 Virgulina piipoides var. compressa, Williamson, 1858, RFGB, p. 63, fig. 131. 



Nineteen stations: 51, 228, 230; WS 76, 80, 83, 86, 87, 88, 92, 93, 98, 99, 210, 215, 221, 225, 245, 

 248. 



Often very common and almost universally distributed. The best specimens and most 

 numerous were obtained from WS 86 and 248. There is, as usual, a considerable amount 

 of variation, a long narrow form, and a shorter, broader form with fewer, but more 

 inflated chambers, which occurs with the type at most stations where it is abundant. 

 They presumably represent the megalo- and microspheric types. 



139. Virgulina schreibersiana var. spinosa, var.n. (Plate IX, figs. 3, 4). 



Two stations: 230, 236. 



At 230 and 236 (close together between Cape Horn and the Falkland Islands) a 

 variety occurs sparingly, distinguished by the upper outer marginal edge of the cham- 

 bers being drawn out into a sharp incurved point or cusp, somewhat resembling the 

 awns on a grass seed. The shell is remarkably thin-walled, showing iridescent colours 

 at 236, and this variation may be due to depauperation of the type, which is normally 

 rather robustly built at 230. At 236, the type was conspicuous by its absence. The variety 

 bears considerable resemblance to V. schreibersiana var. margi?iata, Heron-Allen and Ear- 

 land, described and figured by us in 1922 from South Nigeria {Geol. Survey of S. Nigeria, 

 Bull. no. 3, 1922, Appendix, p. 142, pi. xii, figs. 4 a, b), but the cusps are much more 

 conspicuous and strongly developed in the Falkland specimens than in that variety. 



140. Virgulina subsquamosa, Egger. 



Virgulina subsquamosa, Egger, 1857, MSO, p. 295, pi. xii (pi. viii in the reprint), figs. 19-21. 

 Virgulina subsquamosa, Brady, 1884, FC, p. 415, pi. Hi, figs. 10, 11. 



Two stations: 228, 230. 



