58 BULLETIN 161, UNITED STATES NATIONAL MUSEUM 



as well as in the Mediterranean. Our material fits very well the 

 form described by d'Orbigny, which we have from the type locality. 

 It differs from T. trigonula in the side view on account of the greater 

 inflation of the base, and the chamber is not symmetrical as it is in 

 T. trigonula. The aperture also is distinctive. Those specimens 

 that do not have a circular aperture have the sides toward the base 

 with definite thin lobes, which are difficult to describe but which are 

 shown in the accompanying figures. 



So far as our material shows this species seems to have very definite 

 and restricted distribution. It is abundant in the collections from 

 the Paumotu Islands, occurring both inside the lagoon and off the 

 island of Rongiroa; from the beach off wharf, Hereheretue; on the 

 outer beach and in the lagoon at Pinaki Island. 



Similar specimens occurred at a few Albatross stations, all also off 

 the Paumotu Islands as shown in the accompanying table. 



TRILOCULINA AFFINIS d'Orbigny 



Plate 13, Fig-ores 4 a, 6 



Triloculina aflini* d'Orbigny, Ann. Sci. Nat., vol. 7, p. 299, no. 2, 1826. — Ter- 

 qtjem, Mem. Soc. Geol. France, ser. 3, vol. 2, p. 164, pi. xviii (xv), figs. 1 a-v, 

 18S2. — Fornasini, Mem. Acad. Sci. Istit. Bologna, ser. 6% vol. 2, p. 59, pi. 1, 

 fig. 1, 1905. 



Test slightly longer than broad, triangular in transverse section, 

 the angles subacute and the outer wall of the chamber decidedly con- 

 vex ; sutures distinct, slightly if at all depressed ; wall smooth ; aper- 

 ture generally circular, with a distinctly bifid tooth. Length, 0.35- 

 0.45 mm. • breadth, 0.35-0.4 mm. 



The types of this species were from the Miocene of Dax in the 

 Bordeaux region. Terquem records a somewhat similar form under 

 this name, and Fornasini reproduced outline figures from d'Orbig- 

 ny's plates. An examination of the Miocene material from the type 

 locality of Dax shows that there are forms present there that strongly 

 suggest that this species is closely related to the forms here called 

 Triloculina trigonula. The outer periphery is distinctly convex, al- 

 though the peripheral angles are often rather sharply formed. 



Such specimens occurred at a number of stations as follows: 

 Mokaujar Anchorage, Fiji; Viva Anchorage, 3 fathoms, Fiji; Le- 

 vuka, 12 fathoms, Fiji; near Nairai, Fiji; Rotonga, 7 fathoms; 

 Makemo Lagoon; and in 21 fathoms off Guam Anchorage, Ladrone 

 Islands. It occurred also at several Albatross stations as noted in 

 Table 19. 



