THE 



GEOLOGICAL MAGAZINE. 



NEW SERIES. DECADE V. VOL. I. 



No. VI. — JUNE, 1904. 



OE,ia-iiNr.A.ij -A.i?,TiOLES. 



L — Observations on some of the Foraminifeea of the 

 Oceanic Kocks of Trinidad. 



By E. J. Lechmere Guppy. 



{Concluded from the May Number, p. 199.) 



(PLATES VIII AND IX.) 



THE oceanic beds of Naparima, in Trinidad, contain numerous 

 forms of Foraminifera of great interest, and I propose to make 

 some observations on a few of them. These rocks and their contents 

 were described by me in the Journal of the Geological Society of 

 London, 1892 (vol. xlviii, p. 519). Messrs. Jukes-Browne and 

 Harrison treated of the same subject in the same journal in 1899 

 (vol. Iv, p. 177), and I have given further particulars in the 

 Proceedings of the Zoological Society, 1894 (p. 647), in the 

 Proceedings of the Trinidad Field-Naturalists Club, 1893, and in the 

 Geological Magazine, 1900, p. 322, A few further observations 

 are published in the Proceedings of the Victoria Institute. 



On Gonatosph^ea. (PI. VIII, Figs. 1-7.) 



In the Proceedings of the Zoological Society, 1894, I described 

 a new genus and species from the Bitrupa-hedL of Pointapier, in 

 Trinidad, under the name of GonatospJicsra prolata. The specimens 

 then discovered and described did not enable me to ascertain with 

 any certainty the relationships of the form. Since then I have 

 discovered other specimens which may throw additional light upon 

 these relationships, and I think that there is sufficient interest 

 attached to the subject for me again to bring it forward. The 

 specimens originally discovered were either almost spherical (this 

 being the young form) or a more or less prolate spheroid with 

 a ridge encircling it, as shown in the figs. 14, 16, 19 of the plate 

 appended to the paper quoted. This ridge is the remnant of the 

 wall of the last chamber, which has been broken away in these 

 specimens; while in figs. 15, 17, 18 the last chamber has not been 

 added. The shell begins its existence as a small spherical chamber 

 which in the adult generally shows as a protuberance more or less 



DECADE V. — TOL. I. — NO. VI. 16 



