668 
THE VOYAGE OF H.M.S. CHALLENGES. 
only those of the final convolution on the inferior. Sutural lines on both faces marked 
by rows of exogenous beads of clear shell-substance, largest near the centre of the test ; 
walls conspicuously foraminated. Diameter, ^th inch (P27 mm.). 
An interesting and striking Foraminifer. Its nearest ally is Truncatulina 'prcecincta , 
Karrer, from which it is distinguished by its thinner and slighter build, and by the 
beaded character of the sutural limbation. 
Truncatulina margaritifera is common at Station 209, off the Philippine Islands, 
95 fathoms; it occurs also off the New Hebrides, 125 fathoms; and on the coast of the 
Korea, 10 to 50 fathoms. 
Truncatulina culter, Parker and Jones (PL XCVI. fig.. 3, a.b.c.}. 
Planorbulina culter , Parker and Jones, 1865, Phil. Trans., vol. civ. p. 421, pi. xix. fig. 1, a.b. 
Anomalina bengalensis, Schwager, 1866,. Novara-Exped., geol. Theil, vol. ii. p. 259, pi. vii. 
fig. 111. 
This form is described by Parker and Jones ( loc . cit .) as “a neat, discoidal, biconvex, 
trochiform Planorbulina, showing on its upper face about twenty -five (often more) neatly 
set chambers in a compact spire, bordered with a thin keel, as wide as a whorl of the 
chambers.” To these particulars may be added that the superior or spiral face is much 
less convex than the inferior, that the septal walls are thick and sometimes slightly 
limbate externally, and that the carina of the Challenger specimens is seldom quite so 
wide as laid down in the foregoing quotation. 
Parker and Jones’s specimens were from the “tropical Atlantic, 1080 fathoms.” The 
Challenger gatherings furnish tolerably good examples from two Stations near the Canaries, 
1125 fathoms and 1525 fathoms; from two in the South Atlantic, 675 fathoms and 
1415 fathoms; and from three points amongst the islands of the South Pacific, 580 
fathoms, 610 fathoms, and 1350 fathoms respectively. 
Dr. Schwager states that his Anomalina bengalensis, which may be referred without 
hesitation to the same species, occurs at two horizons of the Pliocene formation of Kar 
Nicobar, and that it is still living on the shores of the Nicobar Islands. 
Truncatulina rostrata, H. B. Brady (PI. XCIV. fig. 6, a.b.c.). 
Truncatulina rostrata, Brady, 1881, Quart. Journ. Micr. Sci., vol. xxi., N. S., p. 65. 
Test biconvex, subnautiloid, slightly asymmetrical ; periphery sharp, subcarinate ; 
consisting of two or three convolutions, of which only the outermost is visible externally. 
Segments numerous, about ten in the final whorl, equitant ; sutures limbate on both faces of 
the test, especially near the centre, those of the later chambers more or less depressed as 
they approach the periphery. Normal aperture an arched labiate fissure, placed trans- 
