54 BULLETIN" 161, "UNITED STATES NATIONAL MUSEUM 



some variations in the shape of the chambers, which are typically 

 irregular, but the general characters of the aperture and arrange- 

 ment of the chambers remain fairly constant. 



TRILOCULINA LABIOSA d'Orbigny SPARSICOSTATA, new variety 



Plate 12, Figures 1 a-c 



Variety differing from the typical in the ornamentation of the sur- 

 face, which has a few, slightly developed, rounding costae with shah 

 low depressions between. 



Holotype of variety. — Cushman Coll. No. 14738, from beach off 

 wharf, Hereheretue Island. 



This variety is abundant at the type locality and occurs as well 

 with the typical at Rutavu, and a single specimen was taken from 

 Albatross Station H3924, 7 miles northwest of Nukutipipi Atoll, 

 Paumotus. 



TRILOCULINA IRREGULARIS (d'Orbigny) 



Plate 12, Figures 2 a-c 



Quinqueloculina irregularis d'Orbigny, Ann. Sci. Nat., vol. 7, p. 302, No. 25, 

 1826. — Fornasini, Mem. Accad. ScL Istit. Bologna, ser. 6", vol. 2, p. 67, pi. 

 3, fig. 14, 1905. 



Test slightly longer than broad, nearly circular in side view, com- 

 pressed, periphery truncate, with the angles produced into definite 

 costae, apertural end slightly extended; chambers distinct; sutures 

 distinct, but not depressed; wall matte, with slightly incised short 

 lines; aperture elongate with a distinct, narrow tooth, with a bifid 

 tip. Length, 0.8 mm.; breadth, 0.5 mm.; thickness, 0.3 mm. 



The types of this species described by d'Orbigny are from the 

 Mediterranean. Very similar specimens occur in considerable num- 

 bers in 40 to 50 fathoms off Fiji Islands. In its general characters 

 it somewhat resembles the one here described as Triloculina oceanica, 

 but the characters of the aperture are very distinctive, and the range 

 of the form with a narrow aperture is very limited. 



TRILOCULINA OCEANICA, new species 



Plate 12, Figures 3 a-c 



Test about as long as broad, the periphery concave with very 

 prominent angles to the chambers, which are acute ; sutures distinct, 

 slightly depressed; wall smooth except for the very coarse costae 

 and angles of the chambers; aperture large, with a semicircular, 

 flattened tooth nearly filling the opening. Length, 0.5-0.6 mm.; 

 breadth, 0.45-0.5 mm. : thickness, 0.3-0.35 mm. 



