EXPLANATION OF PLATE 16 (XVI) 



Figs. 1-4, X 30; Figs. 5, 6, X 20; Fig. 7, X 11 ; Figs. 8, 9, nat. size; Fig. 10, X 3; Fig. 11, X 12. 

 Figures 1-6. — Marginopora vertebralis Blainville. 



Figs. 1, 4. Challenger Sta. 260A, Honolulu reefs. Pacific. (40 fathoms) 

 Figs. 2, 3. Loo Choo Islands, Formosa, Pacific. 



Fig. 6. Challenger Sta. 172, Friendly Islands, Pacific. (18 fathoms) 

 Referred by Brady to Orbitolites complanata Lamarck, a fossil form from the Eocene of France, and by Dou- 

 ville to Marginopora vertebralis (Bull. Soc. geol. France, Ser. 4, Vol. 2, 1902, p. 296), attributing the species 

 to Quoy and Gaimard, in de Blainville, and referring to the figures of Carpenter (1883 and 1856) but not to 

 those of Brady. Cushman (C.L.F.R., Spec. Publ. No. 5, 1933, pi. 24, figs. 15, 16) reproduces figs. 5 and 6 of 

 Brady as Marginopora vertebralis Blainville. Figures 1-4 show early stages of development and may not be the 

 same species, but it seems probable that they are correctly identified. 

 Figure 7. — "Orbitolites duplex Carpenter."* 



Challenger Sta. 173A, off' Fiji, Pacific. (12 fathoms) 

 This is one of Carpenter's original figures of 0. duplex and must therefore be authentic. He places Amphisorus 

 hemprichii Ehrenberg 1839 in synonymy with his Orbitolites duplex 1883, however, (Zool. Voy. H.M.S. Chal- 

 lenger, Part XXI, 1883, p. 25), and this is followed by Douville (Bull. Soc. geol. France, Ser. 4, Vol. 2, 1902, 

 p. 293) who regards duplex as Sorites hemprichii (Ehrenberg). Cushman (U.S.N.M. Bull. 104, Pt. 7, 1930, 

 p. 51) refers Brady's figure to Amphisorus hemprichii Ehrenberg and is followed by Thalmann (Eclog. geol. 

 Helv., Vol. 25, No. 2, 1932, p. 298). The question of the synonymy of Amphisorus with Sorites requires investi- 

 gation, however. The present species should probably be referred to Amphisorus hemprichii Ehrenberg until 

 further detailed studies can be made. 

 Figures 8-11. — Marginopora vertebralis Blainville var. plicata Dana. 



Figs. 8-10. Challenger Sta. 172, Friendly Islands, Pacific. (18 fathoms) 

 Fig. 11. Challenger Sta. 172A?, Tongatabu Reef, Pacific. (? 18 fathoms) 

 Referred by Brady to Orbitolites complanata Lamarck var. laciniata Brady, and by Heron-Allen and Earland 

 (Trans. Zool. Soc. London, Vol. 20, 1915, p. 606) to Marginopora vertebralis var. plicata Dana (C. Wilkes' 

 U. S. Exploring Exped., Vol. 7, 1846, p. 706, pi. 60, fig. 9), though they refer this form to the synonymy of 

 Orbitolites complanata Lamarck (see note on figs. 1-6 above). Hofker (Siboga Exped., Foraminifera Pt. II, 1930, 

 p. 84) states that this form is his "Forma B" or microspheric generation of Marginopora vertebralis. 



*Notf: Lacroix (Bull. I'lnst. Oceanogr., Monaco, No. 787, 1940, p. 14) retains the name Amphisorus hemprichii Ehrenberg (erroneously 

 recorded as "kemprichi") but does not refer to Brady. He also makes Amphisorus a subgenus of Marginopora. This paper (also 1. c. 

 No. 794, 1941) should be studied by anyone working on this complex and little understood group. 



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