﻿82 BULLETIN 103, UNITED STATES NATIONAL MUSEUM. 



Specimens were not uncommon in the Gatun formation at two 

 stations, U!S.G.S. 6035, in gray green, fine grained, sandy shell marl, 

 vicinity of Mindi Hill, and 6036, in dark colored, fine grained, sandy 

 clay marl, from Monkey Hill, Mount Hope Station. 



Genus TRILOCULINA d'Orbigny, 1826. 



TRILOCULINA TRIGONULA (Lamarck). 



Plate 32, fig. 1. 



Miliolites trigonula Lamarck, Ann. Mus., vol. 5, 1804, p. 351, No. 3. 

 Trilocxdina trigonula d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 299, No. 1, 



pi. 16, figs. 5-9. 

 Miliolina trigonula Williamson, Rec. Foram. Great Britain, 1858, p. 83, 



pi. 7, figs. 180-182.— H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 



1884, p. 164, pi. 3, figs. 14-16. 



Description. — Test in apertural view triangular, angles rounded, 

 chambers rapidly increasing in size as added, but three visible in 

 adult test; outer wall broadly rounded, in front view oval, sutures 

 distinct, aperture not produced, lip and tooth indistinct. 



Length, 0.75 mm. Cat. No. 324726, U.S.N.M. 



A single specimen referable to this species occurred at U.S.G.S. 

 5850, in Pleistocene marly material from near Mount Hope, one- 

 fourth mile from present sea beach and about 6 to 8 feet above high 

 tide. 



This is a common species in shallow water of recent oceans. 



TRILOCULINA TRICARINATA d'Orbigmy. 



Plate 32, fig. 2. 



TrilocuUna tricarinata d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 299, No. 7 ; 



Modeles, No. 94.— H. B. Brady, Trans. Linn. Soc. London, vol. 24, 1864, 



p. 446, pi. 48, fig. 3. 

 Miliolina tricarinata H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 



1884, p. 165, pi. 8, figs. 17a, &. 



Description. — Test differing from T. trigonula largely in the an- 

 gles, which are acute, the sides concave, at least toward the borders, 

 center of the side either flat or slightly convex, in end view rather 

 sharply triangular, in front view oval ; neck slightly produced, aper- 

 ture rounded, tooth wanting in this specimen. 



Length, 0.60-0.70 mm. 



Four specimens were collected in the Culebra formation at U.S.G.S. 

 No. 6025, foraminiferal marl about 200 yards south of southern end 

 of switch at Bohio Ridge Station, relocated line, Panama Eailroad. 



Two of the four specimens had the neck somewhat elongated, the 

 others were more nearly normal in this respect. The specimens were 



