136 FORAMINIFERA OF THE CRAG. 



Genus 4. — Orbitolites, Lamarch, 1801. 

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

 Part I, 1866, page 22. 



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

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

 chamberlets. 



1. OivBiTOLiTES COMPLANATUS, Lamarck. Plate III, figs. 45 — 47 {0. orhicidus). 

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



Additional Synonyms : 



Oebitolites complanattjs, &e., Carpenter, 1883. Eeport ' Challenger,' xxi, pp. I 



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

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

 vol. ii, 1885, p. 91, Ac. (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 ovhicnlus, derived from the ''Nautilus orbicMlus " 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, PL III, see above, page 134) ; 

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

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

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

 with others he made Lamarck's name, " 0. complanatus i'^ 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. 



