30 BULLETIN 71, UNITED STATES NATIONAL MUSEUM. 



the Hawaiian Islands; Albatross H4881 in 316 fathoms in Colnett 

 Strait, D4807 in 44 fathoms off Hakodate, Japan, D4874 in 66 

 fathoms eastern channel, Korea Strait, D4900 in 139 fathoms 

 Eastern Sea of Japan, and D5068 in 77 fathoms Suruga Gulf, Japan; 

 Gaspar Straits, North Pacific Exploring Expedition, Captain Rodgers. 

 An extreme form from Nero 1466, in 234 fathoms off Guam, is shown 

 in figure 7. 



SPIROLOCULINA CANALICULATA d'Orbigny. 



Plate 4, figs. 1-3. 



Spiroloculina canaliculate. d'Orbigny, Foram. Foss. Bass. Tert. Vienne, 1846, 



p. 269, pi. 16, figs. 10-12. 

 Spiroloculina impressa II. B. Brady (not Terquem), Rep. Voy. Challenger, 



Zoology, vol. 9, 1884, p. 151, pi. 10, figs. 3, 4. 



Description. — Test elliptical in front view, the ends of the final 

 chamber projecting somewhat at both ends, in end view, the sides 

 nearly parallel, the angles of the periphery of the chamber produced 

 into thin plates, the space between being typically concave, cham- 

 bers rather neatly joined to one another, the joining being flush so 

 that little difference in the surface is noted from the exterior to the 

 center; apertural end produced into a cylindrical neck, with a flaring, 

 phialine lip, the aperture itself being circular with a bifid tooth on 

 the imier margin, the projections forming a concave plate, often an 

 accessory simple tooth on the opposite border of the aperture, wall 

 smooth and shining, white. 



Length, 1-1.5 mm. 



Distribution. — The only North Pacific record for this species that 

 is published is that given by Brady, a Challenger station in the 

 Philippine region, in 95 fathoms. 



In the Tuscarora material the species has occurred at three stations 

 near the Bonin Islands, 1, in 73 fathoms, latitude 27° 07' N.; longi- 

 tude 142° 07' E.; 2, in 108 fathoms, latitude 27° 16' N.; longitude 

 141° 56' E.; and 3, in 345 fathoms, latitude 27° 47' N.; longitude 

 141° 50' E. There are four stations for the species in the Albatross 

 material off Japan, D4874 in 66 fathoms and D4875 in 59 fathoms, 

 both in the eastern channel of Korea Strait; D4900 in 139 fathoms, 

 Eastern Sea of Japan, and D4949, 110 fathoms. 



From the Nero material in the vicinity of the Hawaiian Islands 

 it has occurred at stations 2040 in 21 fathoms and 2071 in 271 

 fathoms. 



This species may be most easily distinguished by the deeply con- 

 cave periphery of the chambers between the two prominent plate- 

 like margins of the chamber. The true S. impressa of Terquem has 

 a flat periphery instead of a concave one. 



