136 FORAMINIFERA OF THE CRAG. 



(lain* 4. — Orbitolites, Lamarck, 1801. 

 Brady, Report ' Challenger,' pp. 62 and 210. 

 Part I, 1866, page 22. 



General Characters. — Discoid ; commencement either spiral and non-embracing 

 or with one or more inflated chambers, then cyclical; chambers divided into 

 chamberlets. 



1. Orbitolites complanatus, Lamarck. Plate III, figs. 45 — 47 (0. orbiculus). 

 Part I, 1866 (0. orbiculus), page 23 ; and Appendix II, Table, No. 21. 



Additional Synonyms : 



Orbitolites complanatus, &c, Carpenter, 1883. Report ' Challenger,' xxi, pp. 1 



—49, pi. i— viii ; Philos. Trans., 1883, p. 562,. 

 figs. 4 & 5 ; Journ. Quekett Microsc. Club, ser. 2, 

 vol. ii, 1885, p. 91, &c. (figs.). 

 — — Brady, 1884. Eeport ' Challenger,' Zool., vol. ix 



p. 218, pi. xvi, figs. 1 — 6 ; pi. 

 xvii, figs. 1 — 6. 



Characters. — In Part I this Foraminifer was treated under the name of 

 Orbitolites orbiculus, derived from the "Nautilus orbiculus" described by Forskal 

 as a white orbicular organism, flat on both sides (faces), marked with subconcentric 

 bead-like, spiral lines, and having all the outer margin perforated with double 

 pores. In his Report ' Challenger ' (1884) Brady has ignored this name, without 

 any explanation. Perhaps he preferred the alternative offered by Parker and 

 Jones in the 'Annals Mag. Nat. Hist.,' ser. 3, vol. viii, 1861, p. 235, and thus 

 regarded it as an adult Orbiculina adunca (like fig. 43, PI. Ill, see above, page 134) ; 

 and perhaps in his opinion Forskal's allusion to its likeness to " Nummulites 

 placentula," probably his " N. major " (now known as N. complanatus), may have 

 made the proposed synonymy less likely. Carpenter also missed this name ; and 

 with others he made Lamarck's name, " 0. complanatus, ," so common that we are 

 inclined to allow the doubtfulness of Forskal's specimen, and to let his be merged 

 in Lamarck's better known name. 



