582 
THE VOYAGE OF H.M.S. CHALLENGER. 
flush, instead of being depressed and crenulated, and the walls are not conspicuously- 
perforated. In some Australian specimens there is no perceptible swelling at the aboral 
end of the test, the Uvigerine portion being small and tapering to a blunt point. 
Schlumberger gives a sectional drawing of a shell of this species ( loc . cit.), in which the 
Uvigerine necks of the earlier segments are long and tubular, each extending nearly 
to the top of the cavity of the succeeding chamber. 
Sagrina columellaris has been collected off Gomera and off Palma, Canaries, at 600 
fathoms and 1125 fathoms respectively; off the Azores, 450 fathoms; off Pernambuco, 
350 fathoms; on the shore at Tamatave, Madagascar; at three Stations on the south- 
east coast of Australia, 6 fathoms to 410 fathoms ; and at five amongst the islands of the 
South Pacific, 125 to 620 fathoms. 
Sagrina bifrons, H. B. Brady (PI. LXXY. figs. 18-20). 
Sagrina bifrons, Brady, 1881, Quart. Journ. Micr. Sci., vol. xxi., N. S., p. 64. 
Test elongate, straight or only slightly curved, compressed ; both sides somewhat 
concave along the median line ; lateral edges thick and rounded Uvigerine segments 
few and distinct ; those of the linear series numerous, short, and not inflated. Sutures 
flush externally ; septa thickened by a deposit of clear shell-substance. Aperture large, 
oval; surrounded by a sessile lip. Length, -^th inch (0'84 mm.). 
This form is nearly allied to Sagrina columellaris, but may be distinguished by its 
short, stout, much compressed contour and thickened septa. 
Sagrina bifrons has only been observed in one locality, the Hyalonema-ground, 
south of Japan, depth 345 fathoms. 
Sagrina dimorpha, Parker and Jones (PI. LXXVI. figs. 1-3). 
Uvigerina ( Sagrina ) dimorpha, Parker and Jones, 1865, Phil. Trans., vol. civ. p. 420, pi. xviii. 
fig. 18. 
The test of Sagrina dimorpha is nearly cylindrical, stoutly built, somewhat tapering, 
and rounded at both ends ; the segments are short and but little inflated ; the walls are 
thin and conspicuously perforated, and the aperture is a wide circular opening with a 
sessile lip or rim. The sutures are slightly excavated externally, and often, though 
not invariably, have a crenellated appearance, owing to the bridging over of the depression 
at regular intervals— a peculiarity well shown in fig. 1, and to a less degree in figs. 2, 3. 
The geographical area inhabited by Sagrina dimorpha is wider than that of any 
other species of the same genus. It extends as far north as Bukken and Oster Fiords, near 
Bergen, Norway (Norman); and a single specimen from the Scottish coast is reported by 
