422 
THE VOYAGE OF H.M.S. CHALLENGER. 
Bolivina beyrichi, Reuss (PI. LIII. fig. 1). 
Bolivina beyrichi, Reuss, 1851, Zeitschr. d. deutsch. geol. Gesellsch., vol. iii. p. 83, pi. vi fig. 51. 
„ „ Hantken, 1875, Mittheil. Jahrb. d. k. ung. geol. Anstalt, voL iv. p. 64, pi. vii. 
fig. 11. 
„ , Terrigi, 1880, Atti dell’ Accad. Pont., ann. xxxiii. p. 198, pi. ii. fig. 44. 
The Bolivina beyrichi of Reuss is closely allied to Bolivina gr amen ( Vulvulina gramen, 
d’Orbigny, — Foram. Cuba., p. 139, pi. i. figs. 30, 31). The principal grounds of distinction 
are the somewhat narrower, more slender contour of Reuss’s species, and the greater 
depth and subtriangular outline of its later chambers, but these are at best very variable 
characters. In both organisms the inferior peripheral angles of the segments project, and 
are drawn out into sharp points which are directed towards the initial end of the test. 
This peculiarity constitutes their most striking feature ; and it may be a question 
whether it is worth while to preserve a “ specific ” separation between two forms so 
similar in their salient characters. 
Bolivina beyrichi occurs at the following Stations : — off the Canaries, 600 fathoms 
and 1125 fathoms; off Sydney, 410 fathoms; off the Ki Islands, 129 fathoms and 
580 fathoms ; off the Philippines, 95 fathoms ; on the Hyalonema- ground, south of Japan, 
345 fathoms ; and on the Pacific shores of Patagonia, 120 fathoms and 345 fathoms. 
In the fossil condition, it is a frequent constituent of the Septaria-clays of Germany 
(Reuss), and of the lower Clavulina-szaboi beds of Hungary (Hantken), as well as of the 
later Tertiary sands of the neighbourhood of Rome (Terrigi). 
Bolivina beyrichi, var. alata, Seguenza (PL LIII. figs. 2-4). 
Vulvulina alata, Seguenza, 1862, Atti dell’ Accad. Gioenia, ser. 2, vol. xviii., p. 113, pi. ii. 
figs. 5, 5a. 
Bolivina beyrichi, var. carinata, Hantken, 1875, Mittheil. Jahrb. d. k. ung. geol. Anstalt, vol. iv. 
p. 64, pi. vii. fig. 12. 
„ „ „ Terrigi, 1880, Atti dell’ Accad. Pont., ann. xxxiii., p. 198, 
pi. ii. figs. 43, 45. 
As the name implies, this is a modification of Bolivina beyrichi, characterised by the 
thinning out of the lateral margins of the test, so as to form a well-defined peripheral 
wing or keel. The entire test is somewhat broader proportionately than that of the type, 
and the wing is of variable form and dimensions. 
Such shells are often met with, both in the recent and fossil condition, wherever the 
typical form is plentiful. Good specimens have been noticed at the following amongst 
other localities : — off Aru Island, 800 fathoms ; off the Philippine Islands, 95 fathoms ; 
off Raine Island, 155 fathoms; off Kandavu, 210 fathoms; and off Cezimbra, south of 
Lisbon, 50 fathoms. 
