FORAMINIFERA OF THE ATLANTIC OCEAN 



37 



Peneroplis carinatus — Material examined 



>Feet. 



PENEROPUS PROTEUS d'Orbigny 



Plate 13, figures 1-17 



Peneroplis protea d'Orbigny, in De la Sagra, Hist. Fis. Pol. Nat. Cuba, 



1839, "Foraminiferes," p. 60, pi. 7, figs. 7-11. 

 Peneroplis proteus Cushman, Proc. U. S. Nat. Mus., vol. 59, 1921, p. 75, 



pi. 18, figs. 13-19; Publ. 311, Carnegie Instit. Washington, 1922, p. 79; 



Publ. 344, 1926, p. 83. 

 Peneroplis dubius d'Orbigny, in De la Sagra, Hist. Fis. Pol. Nat. Cuba, 



1839, "Foraminiferes," p. 62, pi. 6, figs. 21, 22. 

 Orbiculina adunca H. B. Brady, (part). Rep. Voy. Challenger, Zoology, vol. 



9, 1884, pi. 14, figs. 3, 4. 



Test with the early portion close coiled and completely involute, 

 thickened, later portion assuming various shapes and variously 

 flaring but not becoming entirely embracing; chambers numerous, 

 but not many, 10 to 12 usually in the coils of the early portion, 

 usually somewhat higher than in most other species; sutures dis- 

 tinct, depressed; wall very smooth, thick, usually opaque; apertures 

 formed by the row of pores along the median line of the apertural 

 face. 



Length, up to 1.5 mm. 



This is by far the most common species of the genus in the warmer 

 regions of the Western Atlantic. D'Orbigny had it from Cuba 

 and Jamaica. I have had it from the north coast of Jamaica where 

 it was common. It is abundant in the shallow water collections of 

 ihe Tortugas, off Florida, and elsewhere off southern Florida north 

 at least to Biscayne Bay. It is the most common species of the 

 genus in Bermuda, the Bahamas, and Porto Rico, and probably is 

 widely distributed in the general West Indian region. Brady's 

 specimens referred to above are from off Pernambuco, Brazil, and 

 are typical P. proteus. The Albatross obtained it in the same 

 region. 



Some of the variations of this very plastic species are shown on 

 the plate and these could easily be much increased. 



