FOEAMINIFEEA OP THE KEEIMBA AECHIPELAGO. 



595 



15 d, e, / (text-fig. 42, B, C), to Lamarck's species P. {Spirolinites) cylindracens * , 

 apparently on the ground that fig. 15 c (text-fig. 42, A) is complanate in section, whilst 



Text-figure 42. 



A. Nautilus arieiinns Batscb, 1791, fig. Joe. 



B, 0. „ „ „ „ figs. 15 d&/. 

 D. „ „ „ „ fig. 15 a. 



figs. 15 d &f (text-fig. 42, B, C) (15 e is merely a section of 15 d) are circular in the 



section of the later chambers. 



But if compression of the shell is to be taken as the basis for separation between 

 « L. 1804, AM. vol. V. p. 237 ; vol. viii. (1806) p. 387, pi. viii. fig. 15. This plate is reproduced 



(reprinted) in Lamarck's ' Eeeueil de Planches des Coquilles Fossiles des Environs de Paris ' (Paris, 1823). 



