232 EORAMINIFERA OF THE CRAG. 



1. Rhabdogonium tricarinatum (d'Orbigny), 1826. Plate VII, figs. 16 a, b. 



Vaginulina tbicabinata, d'Orb., 1826. Ann. Sci. Nat., vol. vii, p. 258, No. 4; 



Modele, No. 4. 

 Ehabdogonium pteamidale, Karrer, 1861. Sitzungab. k. Akad. Wiss. Wien, 



vol. xvi, p. 444, pi. i, fig. 5. 

 Vaginulina TRicABiifATA, P., J"., and B., 1865. Ann. Mag. Nat. Hist., ser. 3, 



vol. xvi, p. 19, No. 41, pi. i, 

 fig. 34. 

 Oethocebina bhomboidalis, Blake, 1876. Yorkshire Lias, p. 470, pi. xvii, 



fig. 30. 

 Ehabdogonium pyeamidale, Schwager, 1877. Boll. E. Com. Geol. Ital., vol. viii, 



p. 25, pi. o, fig. 5. 



— TEiCAEiNATUM, Brady, 1884. Eeport ' Challenger,' p. 525, 



pi. Ixvii, figs. 1 — 3. 



— — m, BalTcwill and Wright,l%S5. Trans. E. Irish 



Acad., vol. xxviii (Sci), p. 344, 

 pl. xii, figs. 17, 18. 



— — Sherborn and Chapman, 1886. Journ E. Micr. 



Soc, ser. 2, vol. vi, p. 752 

 pl. XV, figs. 16 a, b. 



— — Brady, ParJcer, and Jones, 1888. Trans. Zool. 



Soc, vol. xii, part 7, p. 223, 

 pl. xlv, fig. 3. 



— — Burrows, Sherborn, and Bailey, 1890. Journ. E, 



Microse. Soc, p. 558, pl. x, 

 figs. 7 a, b. 



— — (?), Be Amicis, 1893. Boll. Soc. Geol. Ital., 



vol. xii, fasc. 3, p. 106. 



— — Egger, 1893. Abhandl. k. Bayer. Akad. Wiss., 



vol. xviii, part 2, p. 355, pl. xi, 

 figs. 49, 50 ; pl. xii, figs. 36—38. 



— — var. ACTJTANG0LTJM, Chapman, 1894. Journ. E. 



Microse. Soc. for 1894, 

 p. 159, pl. iv, figs. 8 a, b. 



— — Egger, 1895. Jahresb. Natur. Ver. Passau, 



vol. xvi, p. 23, pl. ii, figs. 

 18 a, J, 19. 



Characters. — Shell three-cornered, varying to quadrangular, tapering; curved or 

 twisted ; chambers compactly set on ; aperture central, with or without a short 

 neck. 



Occurrence. — Bliahdogonium tricarinatum has a wide geographical and bathy- 

 metrical range, but is most common in the North Atlantic, and has not apparently 

 been yet met with in the North Pacific. It is most common in comparatively shallow 



