594 
THE YOYAGE OF H.M.S. CHALLENGER. 
Globigerina cretce, Ehrenberg, 1854, Mikrogeologie, pi. xxvi. fig. 44; — pi. xxx. fig. 38. 
„ stellata, 
Id. 
Ibid. 
pi. xxvi. fig. 45. 
„ ternata. 
Id. 
Ibid. 
pi. xxxv. B, figs. 5, 6. 
Planulina porotetras, 
Id. 
Ibid. 
pi. xx. II. fig. 16. 
„ pertusa, 
Id. 
Ibid. 
pi. xxii. fig. 75. 
,, stigma, 
Id. 
Ibid. 
pi. xxv. fig. 29. 
Rotalia rudis, 
Id. 
Ibid. 
pi. xxiv. figs. 35, 36. 
„ leptospira, 
Id. 
Ibid. 
pi. xxiv. fig. 39. 
„ senaria (pars), 
Id. 
Ibid. 
pi. xxiv. fig. 40. 
Ptygostomum orphei, 
Id. 
Ibid. 
pi. xxxv. B, figs. 1, 2. 
Phanerostomum atlanticum, Id. 
Ibid. 
pi. xxxv. B, figs. 3, 4. 
Globigerina bulloides, Kfibler and Zwingli, 1866, Neujahrsblatt v. d. Biirgerbib. in "Winterthur, 
pt. 2, p. 22, pi. iii. figs. 30, 31. 
„ taminensis, Id. Ibid. p. 24, pi. iii. fig. 26. 
„ bulloides, Gumbel, 1868, Abh. d. k. bayer. Akad. d. Wiss., II. CL, voL x. p. 661, 
pi. ii. fig. 106. 
„ alpigena (?) Id. Ibid. p. 661, pi. ii. fig. 107. 
„ eoccena, Id. Ibid. p. 662, pi. ii. fig. 109. 
Plcinulina mauryana, Ehrenberg, 1873, Abhandl. d. k.Akad. Wiss. Berlin(1872), p.388, pi. iii. fig. 1. 
,, globigerina, Id. 
Ibid. 
p. 388, pi. iii. fig. 3. 
,, megalopentas, Id. 
Ibid. 
p. 388, pi. iv. fig. 7. 
Pglodexia platytetras, Id. 
Ibid. 
p. 388, pi. iii. fig. 14. 
Aristerospira omphalotetras, Id. 
Ibid. 
p. 388, pi. iii. fig. 15. 
Globigerina detrita, Terquem, 1875, Anim. sur la Plage de Dunkerque, fasc. i. p. 31, pi. iy. 
fig. 4, a-c. 
„ bulloides, Id. Ibid. p. 31, pi. iv. fig. 5, a, b. 
„ „ Brady, 1879, Quart. Journ. Micr. Sci., vol. xix., N. S., p. 71. 
Test spiral, subtrochoid ; superior face convex, inferior more or less convex but 
with deeply sunken umbilicus, periphery rounded, lobulated ; adult specimens composed 
of about seven globose segments, of which four form the outer convolution ; the apertures 
of the individual chambers opening independently into the umbilical vestibule. Diameter, 
sometimes ^th inch (0‘63 mm.), but oftener much less. 
The typical Globigerina bulloides was described by d’Orbigny on four or five different 
occasions, in terms which, though not precisely identical, agree in all important particu- 
lars ; and his Model, No. 76, is an excellent illustration of the characters indicated by 
the descriptions. The species is now too well known to require extended notice. It is 
the commonest of all the Globigerine forms, not only throughout the temperate zones, 
where it exists in enormous abundance, but also in areas over which other varieties are 
similarly plentiful. The morphological characters are tolerably uniform, but under different 
external conditions the specimens exhibit considerable diversity in point of size. For 
example, the drawings, PL LXXIX. figs. 6 and 7, both represent fully-grown shells, with 
about the same number of segments, equally magnified. Both are bottom specimens, 
fig. 6 being an average example from the British coast, whilst fig. 7 is one from mid-ocean. 
