296 rORAMINIFERA OF THE CRAG. 



DiscoEBiNA OBBicuiAEis, BalkivUl and Wright, 1885. Trans. E. Irish Acad., 



vol. xxviii (Sci.), p. 349, pi. xiii, figs. 

 31—33. 



— — Brady, 1887. Journ. E. Micr. Soc, p. 918. 



— — Brady, ParJcer, aud Jones, 1888. Trans. Zool. Soc, 



vol. xii, pt. 7, p. 227, pi. xlvi, fig. 1. 



— — Terrigi, 1889. Mem. E. Accad. Lincei, ser. 4, vol. vi, 



p. 115, pi. vii, figs. 2, 3. 



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



xviii, pt. 2, p. 389, pi. xv, figs. 16 — 

 18, 76—78. 



— — Goes, 1896. Bull. Mus. C. Z. Harvard Coll., vol. xxix, 



p. 69. 



Characters. — Test thin, depressed, slightly conical above, flat or nearly so 

 below. The upper face shows numerous, long, narrow, curved, and overlapping 

 chambers ; the last the longest. Sutures usually simple, sometimes slightly 

 limbate. On the lower face only three or four chambers visible, the last much 

 the largest. Umbilical flaps present. 



Occurrence. — Discorhina orbicularis has a very wide geographical and bathy- 

 metrical range, but it has not hitherto been found in Arctic or Antarctic waters. 

 The Irish Sea appears to be the most northern limit known. The ' Challenger ' 

 Report states that it is plentiful in the shallow water among the Pacific Islands, 

 and also amongst the West Indies. Egger, in his ' Gazelle ' Memoir, records it 

 from the Cape Verde Islands and other points off the West Coast of Africa, 

 Mauritius, Western Australia, and the Atlantic Ocean. The greatest depths 

 recorded in the ' Challenger ' Report is 435 fathoms ; but the ' Gazelle ' obtained 

 specimens from a depth of 2590 fathoms in the South Atlantic Ocean. 



As a fossil it has been recorded from the Neocomian (Bargate Beds of Surrey), 

 the Miocene of Italy and Muddy Creek (Victoria), and the Pliocene of Italy and 

 St. Brth. In the Coralline Crag we have found it in every zone examined. 



5. DiscoRBiNA PAKisiENSis (d'Orhigny), 1826. Plate II, figs. 13 — 15. 

 Part I, 1866 ; Appendices I and II, Tables, No. 77. 



EosALiNA PAEisiExsis, d'Orb., 1826. Ann. Sci. Nat., vol. vii, p. 271, No. 5 ; 



Modele, No. 38. 

 DiscoEBiNA PABISIENSI8, Parker, Jones, and Brady, 1865. Ann. Mag. Nat. Hist., 



ser. 3, vol. xvi, p. 25, pi. 2, fig. 70. 

 — — J., P., and B., 1866. Monogr. For. Crag, App. i aud ii, 



Tables, No. 77, pi. ii, figs. 13—15. 



