TROPICAL PACIFIC FORAMINTFERA OF ALBATROSS 



57 



wide, in end view rounded, triangular, the sides convex ; sutures dis- 

 tinct; wall smooth; aperture with a rather broad bifid tooth. 

 Length, 0.5-0.85 mm. ; diameter, 0.4-0.45 mm. 



As noted previously in Bulletin 104, Lamarck's type of this spe- 

 cies is from the Eocene of the Paris Basin, and before the applica- 

 tion of this name can be very definitely and accurately used it would 

 be necessary to make sections of microspheric specimens to determine 

 the characters of the early stages. It has been the usual custom 

 for authors to place under this species almost any of the triangular 

 forms that have the edges rounded. 



Such specimens as that figured here are fairly common in our 

 material occurring off Fiji at Mokaujar Anchorage; 12 fathoms off 

 Nairai; 12 fathoms off Levuka; and also from Makemo beach and 

 Rutavu, as well as a specimen from Albatross Station H3936, 0.3 

 mile east of Hereheretue Atoll, Paumotus. 



TRILOCULINA AUSTRIA CA d'Orbigny 



Plate 13, Figukes 2 a, o 



Triloculina austriaca dOrbigny, Foram. Foss. Bass. Tert. Vienne, p. 275, pi. 16, 

 figs. 25-27, 1846. 



Test slightly longer than broad, generally triangular in transverse 

 section, the sides and periphery of the chambers rounded; chambers 

 distinct, inflated, usually broader at the base than at the apertural 

 end, giving an asymmetrical shape to the test in front and side views ; 

 sutures distinct, slightly depressed; wall smooth and polished, but 

 often marked by very slight elongate pits; aperture either rounded 

 or somewhat modified as shown in the accompanying figures, with an 

 elongate tooth bifid at the tip, apertural lip thin and slightly everted. 

 Length, 0.7 mm.; breadth, 0.45 mm.; thickness, 0.4 mm. 



A number of the species described by d'Orbigny from the Miocene 

 of the Vienna Basin are found still living in the Indo-Pacific region 



Table 18. — Triloculina austriaca — material examined 



1 Key to abbreviations is given in Table 1. 



