REPORT ON THE EORAMIN1EERA. 
605 
Globigerina helicina , d’Orbigny (PI. LXXXI. figs. 4 , 5). 
“ Poljmorplia globulifera,” Soldani, 1791, Testaceograpliia, vol. i. pt. 2, p. 119, pi. cxxx 
figs, pp, qq, rr. 
Globigerina helicina, d’Orbigny, 1826, Ann. Sci. Nat., vol. vii. p. 277, No. 5. 
„ „ Parker, Jones, and Brady, 1871, Ann. and Mag. Nat. Hist., ser. 4, 
voL viii. p. 175, pi. xi. fig. 113. 
„ „ Brady, 1879, Quart. Journ. Micr. Sci., vol, xix., N. S., p. 287. 
Test oblong or ovate, consisting of five or six more or less inflated chambers arranged 
on the normal Rotaliform plan, with the addition of one or two supplementary segments 
at points of the periphery out of the spiral line ; aperture consisting usually of two 
orifices on the inferior and two or more on the superior face of the test. Longer 
diameter, ^th inch (0’84 mm.). 
It may be questioned whether the Globigerina helicina of d’Orbigny possesses 
characters which entitle it to rank as a zoological variety, and whether the forms it 
includes would not be better treated as examples of monstrous or abnormal development. 
Nevertheless the peculiar features of the test are tolerably constant. It most resembles an 
ordinary small Globigerine shell of the “ rubra ” type, with the addition of an inflated 
chamber at two opposite points of its periphery. The superior face is obscurely spiral, and 
shows two, three, or more apertures ; the inferior has four visible segments, two large and 
oblong, laid side by side, and two small and rounded, one at each end of the test ; and the 
latter have inferior apertures. Of the figures in Soldani’ s Testaceograpliia, referred to 
by d’Orbigny, that marked qq, which gives both the superior and inferior aspects of the 
shell, is the most characteristic, and leaves nothing to be desired in point of definition. 
It is interesting to note that examples precisely analogous, from a morphological point 
of view, to those upon which this variety is founded, occur in other genera of the 
Globigerinidce, notably in Pullenia and Candeina (PI. LXXXI V. fig. 19, and 
PI. LXXXII. fig. 19). 
Globigerina helicina is a comparatively rare form. Occasional specimens have been 
met with at nine or ten Challenger Stations, scattered over the North and South Atlantic 
and the South Pacific ; to which may be added, on the authority of Soldani, certain 
points in the Mediterranean and the Adriatic. 
It occurs as a fossil in the later Tertiaries of Central and Southern Italy (Jones and 
Parker, Seguenza). 
Globigerina cequilateralis, H. B. Brady (PI. LXXX. figs. 18-21). 
Cassiclulina glolulosa (pars), Egger, 1857, Neues Jahrb. fur Min., &c., p. 296, pi. xi. fig. 4. 
Globigerina cequilateralis , Brady, 1879, Quart Journ. Micr. Sci., vol. xix., N. S., p. 71. . 
Test planospiral, compressed, bilaterally symmetrical, typically evolute ; consisting of 
rather more than a single loosely-coiled convolution; segments usually about six in 
(ZOOL. CHALL. EXP. — PART XXII. — 1884.) Y 77 
