DISCORBINA LINGULATA. ^97 



DiscoEBiNA PAKisiExsis, Morvis, 1876. Lect. Geol. Croydon, p. 8, figs. 3 and 7. 



— — Wright, 1877. Proc. Belfast Field Club for 1876-7, 



Appendix, p. 105, pi. iv, figs, la — d 

 (not la — e). 

 DiscOEBis PAEisiENsis, BertheUn, 1878. Ann. Soe. Ac. Nantes, ser. 5, vol. viii, 



p. 242, No. 65. 

 EosALiNA PAEisiENSis, Terquem, 1882. Mem. Soc. G-eoi. France, ser. 3, vol. ii, 



p. 99, pi. X (xviii), figs. 15—17. 

 DiscoEBiNA PAUisiENSis, Brady, 1S84. Eep. ' Challenger,' pp. 627 and 648, pi. xc, 



figs. 5, 6, 9—12. 



— — — 1887. Journ. E. Micr. Soc, p. 919. 



— — Egger, 1893. Abhandl. k. Ak. Bayer. "Wiss., vol. xviii, 



part 2, p. 391, pi. xv, figs. 25—30. 



— — Goes, 1894. K. Svensk. Vet.-Ak. Handl., vol. xxv. 



No. 9, p. 93, pi. XV, fig. 791. 



Characters. — Shell plano-convex, sometimes witli an obtusely pointed apex; 

 consisting of two or three convolutions of long, oblique, arcuate chambers, seven 

 to nine in a convolution ; inferiorly the segments of the last convolution extend 

 to the umbilicus. Upper surface smooth ; the last and the earlier chambers 

 variously exposed in different specimens ; the sutures simple ; the lower face of 

 the shell shows several curved and some intercalated chambers, and is ornamented 

 with radiating lines of minute tubercles. Peripheral margin thin, rarely lobulate. 



Occurrence. — Discorbina parisiensis is generally of rare occurrence in the recent 

 condition, and appears to have a somewhat restricted range ; but it is not uncommon 

 in the shore-sand of Mount's Bay, Cornwall (Millett). The ' Challenger' found 

 specimens only off Kerguelen at depths of 20 to 50 fathoms. The ' Gazelle ' found 

 specimens off Rerguelen, and also off Mauritius (70 to 220 fathoms) ; off South- 

 West Australia (2159 fathoms), and off West Australia at less depths. Specimens 

 have also been obtained in shallow water off the coasts of Ireland and France. 



The earliest records of the species in a fossil condition is from the Neocomian 

 (Bargate Beds) of Surrey. It has also been found in the Eocene (Calcaire 

 Grossier), and in the Pliocene of St. Erth. We have specimens in our own 

 collections from the Casterlian and Scaldisian of the Kattendyk Docks, Antwerp. 

 In the Coi'alline Crag we have found it in every zone examined, and it has also 

 been obtained (small and rare), as stated in the First Part of this Monograph, from 

 the Red Crag. 



6. Discorbina lingulata, sp. nov.. Burrows and HoUand. Plate VII, figs. 33 o — c. 



DiscoEBiKA BICONCATA, Brady, 1S84. Eeport " Challenger,' p. 653, pi. xci, fig. 3 



(not fig. 2). 



