424 
THE VOYAGE OF H.M.S. CHALLENGER. 
Bolivina nobilis, Hantken (Pl. LIII. figs. 14, 15). 
Bolivina nobilis, Hantken, 1875, Mitttieil. Jalirb. d. k. ung. geol. Anstalt, vol iv. p. 65, pL xv. 
fig. 4, a. b. 
In general contour, in the form and arrangement of the segments, and in the surface- 
ornament of delicate, parallel, longitudinal s trite, the recent examples of this species agree 
accurately with von Hantken’s description and figure ; but such as have been hitherto 
obtained are not as a rule so large as the fossil specimens. 
So far as can be learnt from the Challenger dredgings, the occurrence of Bolivina 
nobilis is confined to the South Pacific. The following are the localities at which it has 
been collected : — Humboldt Bay, Papua, 37 fathoms ; N ares Harbour, Admiralty Islands, 
17 fathoms; off Tahiti, 420 fathoms ; off Levuka, Fiji, 12 fathoms ; and Port Jackson, 
6 fathoms. 
Yon Hantken’s specimens were from the later Clavulma-szaboi formation of Ofen 
(Buda), Hungary. 
Bolivina hantkeniana , H. B. Brady (Pl. LIII. figs. 16-18). 
Bolivina hantlceniana, Brady, 1881, Quart. Journ. Micr. Sci., vol. xxi. N. S., p. 58. 
Test depressed, nearly equally convex on the two faces ; varying in contour, from a 
relatively long form tapering to a point at the aboral extremity, to a broadly oval modification 
with rounded ends. Composed of numerous, rounded, inflated segments, in two more or 
less regular alternating series, surrounded by a delicate keel of varying width and com- 
pleteness. Aperture oval ; with a thickened lip or border, and often furnished with a 
projecting tongue. Surface generally traversed by short, delicate, longitudinal costae. The 
long narrow specimens which seldom have a continuous wing attain a length of -g^th inch 
(0'84 mm.) or more; whilst those of wider proportions with the broader more regular 
wing are less than ^th inch long (0'6 mm.) and about 5 \yth inch (0‘5 mm.) broad. 
Bolivina hantkeniana is a polymorphic species, and its range of variation is suggested 
rather than fully represented by the drawings. 
Its area of distribution appears to be limited to the islands of the Pacific, the following 
being the only localities at which it has been observed : — off Tahiti, 420 fathoms and 620 
fathoms ; off Kandavu, 210 fathoms and 255 fathoms; off New Hebrides, 130 fathoms ; 
and off Aru Island, 800 fathoms. 
Bolivina karreriana, H. B. Brady (Pl. LIII. figs. 19-21). 
Bolivina karreriana, Brady, 1881, Quart. Journ. Micr. Sci., vol. xxi., N. S., p. 58. 
Test elongate, tapering, broadest near the oral end, somewhat depressed ; aboral ex- 
tremity pointed, often mucronate ; peripheral edge thick and rounded, more or less 
