24 BULLETIN 71, UNITED STATES NATIONAL MUSEUM. 



Genus CYMBALOPORA Hagenow, 18SO. 



Rotalia (part) d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 272. 



Rosalina (part) d'Orbigny, in De la Sagra, Hist. Fis. Pol. Nat. Cuba, 1839, 



" Foraminif eres, " p. 100. 

 Cymbalopora Hagenow (type, C. poeyi (d'Orbigny)) Bryozoen Maastrichter Kreide, 



1850, p. 104. — H. B. Brady (part), Rep. Voy. Challenger, Zoology, vol. 9, 



1884, p. 635. 



Description. — Test free; early chambers spirally arranged, later 

 ones annular or irregular; umbilicate; wall finely perforate; chambers 

 often not contiguous, but separated from one another by some dis- 

 tance along the periphery, marked on the ventral side by depressions 

 radiating from the central umbilicus; in the various species the early 

 chambers following the proloculum are usually brownish in color, 

 this being wanting in the later adult chambers. 



This genus, together with the following one, Tretomphalus, has been 

 placed with the Globigerinidre by some authors. In the general 

 form of the test, especially in the latter genus, there is a striking 

 resemblance, but it seems merely parallelism. The early chambers 

 are decidedly like Discorbina in form, wall, aperture, and even in the 

 peculiar brown coloring so characteristic of Discorbina and allied 

 genera of the Rotaliidse. 



There seem to be enough differences in form and structure to keep 

 separate the genus Cymbalopora from Tretomphalus, as has been done 

 by Moebius. 



CYMBALOPORA POEYI (d'Orbigny). 



Plate 10, fig. 1; plate 14, fig. 5. 



Rotalia squamosa d'Orbigny (nomen nudum), Ann. Sci. Nat., vol. 7, 1826, p. 272, 



No. 8. 

 Rosalina poeyi d'Orbigny, in De la Sagra, Hist. Fis. Pol. Nat. Cuba, 1839, 

 "Foraminif eres," p. 92, pi. 3, figs. 18-20. 



Cymbalopora poeyi Carpenter, 



Parker, and Jones, Introd. 



Foram., 1862, p. 215, pi. 13, figs. 



10-12. — Schwager, Boll. Com. 



Geol. Ital., vol. 8, 1877, p. 26, pi., 



fig. 56. — Moebius, Beitr. Meeres- 



fauna Insel Mauritius, 1880, p. 



a If c 97, pi. 10, figs. 1-5. — Butschli, in 



Fig. 28.— Cymbalopora poeyi (d'Orbigny). a, Bronn, Klassen und Ordnungen 



dorsal view; 6, side yiew; c, ventral view. Thier-Reichs, 1880, p. 202, pi. 9, 



(After d Orbigny.) ' ' * ' r ' 



fig. 4. — H. B. Brady, Rep. Voy. 



Challenger, Zoology, vol. 9, 1884, p. 636, pi. 102, figs. 13a-c— H. B. Brady, 

 Parker, and Jones, Trans. Zool. Soc, vol. 12, 1888, p. 226, pi. 46, fig. 12.— 

 Egger, Abh. kon. bay. Akad. Wiss. Munchen, Cl. n, vol. 18, 1893, p. 381, 

 pi. 18, figs. 51, 52. — Silvestri, Mem. Pont. Accad. Nuovi Lincei, vol. 15, 

 1899, p. 280, pi. 6, fig. 3.— Flint, Ann. Rep. U. S. Nat. Mus., 1897 (1899), p. 

 326, pi. 72, fig. 1.— Millett, Journ. Roy. Micr. Soc, 1904, p. 696.— Rhum- 

 bler, Zool. Jahrb., Abt. Syst., vol. 24, 1906, p. 71, pi. 5, fig. 59.— Bagg, 

 Proc. U. S. Nat. Mus., vol. 34, 1908, p. 156. 



