FORAMINIFERA OP THE NORTH PACIFIC OCEAN. 29 



ture arched or rounded, formed of the slightly constricted end of the 

 tube. 



"Longer diameter, one-thirtieth inch (0.8 mm.)." 

 Distribution. — Brady gives a single North Pacific record for this 

 species, Challenger station 241 in 2,300 fathoms. I have found no 

 specimens in the material I have examined. The figures and de- 

 scription are from Brady. 



Genus SPIROLOCULINA d'Orbigny, 1826. 



Spirolociilina d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 298 (Type S. depressa, 

 d'Orbigny).— H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 147. 



Description. — Test composed of chambers arranged planospirally, 

 all visible typically from opposite sides of the test, early chambers 

 after the proloculum sometimes a coil or more in length, but the 

 adult chambers one-half coil in length; aperture typically somewhat 

 produced; aperture circular, with a prominent lip and a bifid tooth 

 occasionally, with a secondary tooth directly opposite the primary one. 



Certain of the species which were described as Spiroloculina have 

 typical quinqueloculine development until the final chambers, and 

 for these the genus Massilina was created by Schlumberger. 



SPIROLOCULINA DEPRESSA d'Orbigny. 

 Plate 3, figs. 6-10. 



Spiroloculina depressa d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 298. — Wil- 

 liamson, Rec. Foram. Great Britain, 1858, p. 82, pi. 7, fig. 177. — Terquem, 

 Mem. Soc. Geol. France, ser. 3, vol. 1, 1878, p. 54, pi. 5, fig. 11. — Wiesner, 

 Archiv. Prot., vol. 25, 1912, p. 210. 



Spiroloculina limbata H. B. Brady (not d'Orbigny), Rep. Voy. Challenger, 

 Zoology, vol. 9, 1884, p. 150, pi. 9, figs. 15-17. 



Description. — Test in side view elliptical or rounded, in end view 

 with the sides nearly parallel, the periphery flattened or even slightly 

 convex, chambers numerous, in front view with the periphery and 

 the inner margin of the chamber raised, the intermediate space more 

 or less depressed, giving the appearance of having limbate sutures; 

 apertural end of the chamber usually with a short neck hardly 

 extending beyond the margin of the test, lip little if at all developed; 

 aperture nearly circular; tooth single with a bifid tip; wall smooth, 

 dull. 



Length, 1-1.5 mm. 



Distribution. — Brady in the Challenger report includes the North 

 Pacific indirectly in his statement of distribution for this species, 

 but gives no definite localities. 



In the material that I have examined the species has occurred a 

 number of times, as follows: Tuscarora 2, in 108 fathoms, latitude 

 27° 16' N.; longitude 141° 56' E.; Nero 2033 in 249 fathoms, 2034 

 in 175 fathoms, 203G in 82 fathoms, and 2041 in 33 fathoms, all off 



