FORAMINIFERA OF THE ATLANTIC OCEAN 39 



PENEROPUS PLANATUS (Fichtel and Moll) 



Plate 14, figures 6, 7 



Nautilus {Lituus) arietinus Batsch ^(part), Conch. Seesandes, 1791, p. 4, 

 pi. 6, figs. 15 a, b. 



Nautilus planatus, var. (3, Fichtel and Moll, Test. Micr., 1803, p. 91, pi. 16, 

 figs, d, e, f. 



Peneroplis lanatus Montfort, Conch. Sj'st., 1808, vol. 1, p. 258, 65" genre. 



Peneroplis planatus d'Orbignt, Ann. Sci. Nat., vol. 7, 1826, p. 285, No. 1, 

 Modules, No. 16. — Williamson, Rec. Foram. Great Britain, 1858, p. 45, 

 pi. 3, figs. 84, 85. — ScHLUMBERGER, FeuiUe Jeunes Nat., vol. 12, 1881, 

 pi. 1, fig. 13.— H. B. BRADr, Rep. Voy. Challenger, Zoology, vol. 9, 1884, 

 p. 204, pi. 13, fig. 15.— Jones, Foram. Crag, pt. 2, 1895, p. 133, pi. 6, 

 fig. 5. — Heron-Allen and Earland, Trans. Zool. Soc. London, vol. 20, 

 1915, p. 601.— CusHMAN, Bull. 100, U. S. Nat. Mus., vol. 4, 1921, p. 481.— 

 Heron-Allen and Earland, Trans. Zool. Soc. London, vol. 22, 1926, p. 69, 

 (list). 



Peneroplis perlxisus, var. planatus A. Silvestri, Atti Accad. Sci. Acireale, 

 vol. 7, 1895-96, p. 42.— Dakin, Rept. Pearl Oyster. Fish., Ceylon, 1906, 

 p. 231.— Bagg, Proc. U. S. Nat. Mus., vol. 34, 1908, p. 124.— Sidebottom, 

 Mem. Proc. Manchester Lit. Philos. Soc, vol. 54, No. 16, 1910, p. 7. — 

 CusHMAN, Bull. 71, U. S. Nat. Mus., pt. 6, 1917, p. 87, pi. 37, fig. 3; 

 Publ. 213, Carnegie Instit. Washington, 1918, p. 290. 



Cristellaria planata Lamarck, Tableau Encycl. Meth., 1816, pi. 467, figs. 

 1 a~c. 



Cristellaria dilatata Lamarck, Tableau Encycl. Meth., 1816, pi. 467, fig. 2 a-c. 



Test much compressed, the early portion coiled planispirally but 

 often partially evolute, later portion very much campanulate and 

 spreading out, reaching back on both sides toward the earlier chambers 

 but not en.tirely embracing ; chambers distinct, very slightly inflated, 

 broad and low; sutures distinct, depressed, occasionally somewhat 

 limbate; wall very distinctly striate, the striae numerous and nearly 

 parallel to the periphery; apertures along the median line of the nar- 

 row apertural face. 



This species is abundant in the Mediterranean and in the Indo- 

 Pacific, but does not, so far as I have seen, come into the West Indian 

 region, where it is replaced by the following species. In the eastern 

 Atlantic, what seem to be typical specimens are recorded from off 

 the coast of Great Britain, and very likely the species like other 

 Mediterranean ones extends out into the warmer parts of the eastern 

 Atlantic. 



