4 PROCEEDINGS OF THE NATIONAL MUSEUM vol. V5 



Family MILIOLIDAE 



Genus QUINQUELOCULINA d'Orbigny, 1826 



QUINQUELOCULINA, species (?) 



Plate 1, figures 6 a, 6 



The broken specimen here figured has a few longitudinal striations, 

 but it is impossible to determine whether this is an adult or not and 

 so no attempt has been made to place it specifically. It is from off 

 Santa Elena, Ecuador. 



QUINQUELOCULINA. species (?) 



Plate 1, figures 7 a-c 



This smooth form also from off Santa Elena, Ecuador, has not 

 enough specimens to give full specific characters. It appears to be 

 quinqueloculine, but may be only the early stage of a smooth Trilocu- 

 lina. A very few specimens of this group were also obtained from 

 off Corral, Chile, but not enough for identification. 



Family TROCHAMMINIDAE 



TROCHAMMINA PERUVIANA, new species 



Plate 1, figures 8 o, 6 



Test trochoid, spire greatly flattened, dorsally very slighly convex, 

 ventrally slightly concave, consisting of three or four whorls; chambers 

 numerous, 10 or more in the last-formed whorl, of rather uniform 

 size and shape increasing slowly in size as added ; sutures on the dorsal 

 side gently curved, very slightly depressed, only those of the last- 

 formed whorl distinct, on the ventral side gently curved or with a 

 sinuous, lobed condition especially in later portions, distinct; wall 

 finely arenaceous with much chitin, thin, very flexable when wet; 

 aperture ventral, along the inner margin of the last-formed chamber. 



Diameter, 0.45 mm. 



Holotype. —{C&t. No. 20784, U.S.N.M.) From off Eten, Peru. 



This species is closely allied to Trochammina ochracea Williamson 

 and T. plicata Terquem. The peculiar sinuous arrangement of the 

 ventral side is different from either of these, of each of which we 

 we have had excellent series of recent European specimens for 

 comparisons. 



Family NONIONIDAE 



Genus NONION Montfort, 1808 



NONION PIZARRENSIS Berry 



Plate 1, figures 10 a, b; plate 2, figures I a, b 



Nonion pizarrensis Berry, Journ. Pal., vol. 1, 1927-28 (1928), p. 269, figs. 1-3 

 (in text). 

 Test nearly bilaterally symmetrical, slightly longer than broad in 

 side view, periphery broadly rounded, umbilici depressed but not 



