FORAMINIFERA OF THE NORTH PACIFIC OCEAN. 61 



SIGMOILINA CELATA (Costa). 



Plate 24, fig. 1. 



Spiroloculina eelata Costa, Mem. Accad. Napoli, vol. 2, 1855, p. 126, pi. 1, fig. 14. 

 Planispirina celata H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 

 197, pi. 8, figs. 1^. 



Description. — Test oval or elliptical in front view, the ends rather 

 pointed; in side view narrow, chambers numerous, two to a convo- 

 lution, one side of the chamber convex, the other slightly concave 

 and extending back over the previous ones of that side, giving the 

 characteristic double curve to the test; wall on the outside composed 

 of cemented sand grains, somewhat roughened, smooth and calcareous 

 within ; aperture transversely placed, often with a short, simple tooth. 



Length, usually about 1 mm. 



Distribution. — There is a single published record for the North 

 Pacific, that given by Flint, from Albatross station 3080, in 93 fathoms, 

 off the coast of Oregon. I have had a considerable number of sta- 

 tions represented in the material at my disposal; from the Nero 

 material especially on the line between Guam and Japan. The sta- 

 tions range from 891 to 1,529 fathoms, from the Albatross material, 

 about Japan in shallower water 139 to 437 fathoms, and from one 

 Tuscarora station 58, in 814 fathoms, latitude 26° 52' N.; longitude 

 142° 21' E. 



This species is much more common than the preceding, as a rule 

 occurring in fairly deep water. 



SIGMOILINA SIGMOIDEA (H. B. Brady). 



Plate 24, figs. 2, 3. 



Planispirina sigmoideaH. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, 

 p. 197, pi. 2, figs. 1-3, woodcut, fig. 5c. 



Description. — "Test free, oblong, with slightly projecting or pointed 

 ends, the two faces unequally convex, peripheral edge thin, and 

 slightly rounded; composed of numerous segments, two to each con- 

 volution, arranged on the milioline plan, the aperture alternately at 

 either end of the shell. Segments, seldom exceeding 12 in number, 

 arched longitudinally, and set at the outer margin of the alternate 

 sides, the inner margin of the wall of each segment spreading over 

 one lateral surface of the test, whilst the lateral extension of its suc- 

 cessor in its turn covers the opposite side. Aperture, a curved trans- 

 verse orifice in the prominence at the anterior end of the shell. 



"Length, one-thirtieth inch (0.85 mm.)." 



Distribution. — There are apparently no published records for this 

 species from the North Pacific. I have had material from but five 

 stations, Nero 649 in 762 fathoms, 990 in 859 fathoms, and 1320 in 



