66 



BULLETIN 71, UNITED STATES NATIONAL MUSEUM. 



Fig. 31.— Tmloculina trigonula 

 (lamarck). x50. outline 

 figure showing apertural 

 characters. 



Distribution. — Brady records a single North Pacific station for 

 this species, Challenger station 260A in 40 fathoms on the coral reefs 

 of Honolulu, Hawaiian Islands. Bagg records it from the following 

 five Albatross stations hi the vicinity of the Hawaiian Islands, D4000 

 in 104-213 fathoms, D4017 in 305 fathoms, D4025 in 275-368 fath- 

 oms, H4568 in 1,274 fathoms, and H4696 

 hi 367 fathoms. In the Nero material it has 

 occurred about the Hawaiian Islands at two 

 stations at 2041 in 33 fathoms and 2071 in 

 271 fathoms. In the Albatross material it 

 was recorded off Japan at D4807 in 44 fath- 

 oms, D4900 in 139 fathoms, and D5068, 

 Suruga Gulf, 77 fathoms, and in Colnett 

 Strait in 316 fathoms. At one Tuscarora 

 station 1/3 it occurred, latitude 27° 7' N., 

 longitude 142° 7' E. in 73 fathoms. 



This species is distinguished from the fol- 

 lowing by the angles of the test which in this 

 species are rounded and the sides convex. 

 Young specimens of Biloculina sometimes may be confused with this 

 species but usually apertural or other characters will serve to dis- 

 inguish them as well as the adults of Biloculina that they may be 

 associated with. 



TRILOCULINA TRICARINATA d'Orblgny. 

 Plate 25, figs. 1, 2. 



Triloculina 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, 18G4, 



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

 Miliolina tricarinata H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, 



p. 165, pi. 3, fig. 17a, b. 



Description. — Test in the adult with three visible chambers, 

 smooth, the angles of the chambers sharply angled, almost carinate, 

 whole test somewhat longer than wide, in end view triangular, the 

 *ides straight; aperture with a narrow bifid tooth. 



Length, usually about 1 mm. 



Distribution. — Goes records T. tricarinata from a single Albatross 

 station, 3433 in 1,218 fathoms. Bagg records it from the following 

 four Albatross stations near the Hawaiian Islands: D4000 in 104 to 

 213 fathoms, D4025 in 275 to 368 fathoms, D4174 in 735 to 865 

 fathoms, and H4694 in 865 fathoms. In the North Pacific material 

 I have examined the species has occurred about the Hawaiian Islands, 

 Midway Island, Guam, and at a number of stations off Japan. These 

 stations range as low as 1,850 fathoms. 



