718 
THE VOYAGE OF H.M.S. CHALLENGER. 
Gypsina vesicularis, Parker and Jones, sp. (PL CI. figs. 9-12). 
Orbitolina vesicularis, Parker and Jones, 1860, Ann. and Mag. Nat. Hist., ser. 3, vol. vi. p. 31, 
No. 5. 
„ „ var. congesta, Id. Ibid. p. 32,— No. 6. 
Tinoporus Icevis, Carpenter, 1860, Phil. Trans., p. 559, pi. xxi. figs. 1-3. 
„ vesicularis, Id. 1862, Introd. Foram., p. 224, pi. xv. figs. 1-4. 
„ Icevis, Brady, 1864, Trans. Linn. Soc. Loud., vol. xxiv. p. 470, pi. xlviii. fig. 17. 
Gypsina vesicularis, ‘Carter, 1877, Ann. and Mag. Nat. Hist., ser. 4, vol. xx. p. 173. 
The external aspect of this variety is sufficiently illustrated by the drawings (PI. CI. 
figs. 9-11). The test is convex or subconical, frequently taking the form of a truncated 
cone like the lower half of a sugar-loaf. The exterior is marked by an irregular network 
of raised lines, which indicate the boundaries of the constituent chambers. The raised 
bands are generally composed of clear shell-substance, whilst the enclosed areolae are 
somewhat coarsely foraminated. The internal structure, which is shown in the trans- 
parent section (fig. 12), differs in no important respect from that of Gypsina globulus. 
As already stated, the distribution, whether geographical or geological, is practically 
the same as that of the allied form. 
Gypsina inhcerens, Schultze, sp. (PL CII. figs. 1-6). 
Acervulina inlicerens, Schultze, 1854, Organ, der PolythaL p. 68, pi. vi. fig. 12. 
Polytrema, sp., Brady, 1866, Report Brit. Assoc., Trans., p. 70. 
Tinoporus lucidus, Id., 1870, Edin. Catal. Brit. Foram., p. 8. 
Cellepora hemisphcerica, Parfitt, 1873, Ann. and Mag. Nat. Hist., ser. 4, vol. xii. p. 98, pi. iii. b. 
figs. 1-6. 
Tinoporus lucidus, Robertson, 1874, Trans. Geol. Soc. Glasgow, vol. i. pt. 1, table. 
„ „ Wright, 1877, Proc. Belfast Nat. Field Club,M 876-7, App., p. 105, pi. iv. 
figs, 4, 5. 
„ „ Terrigi, 1880, Atti dell’ Accad. Pontif., ann. xxxiii. p. 213, pi. iv. fig. 70. 
Gypsina inhcerens is the commonest parasitic modification of the type. The test 
consists of a variable number of inflated or vesicular chambers, associated either in a convex, 
acervuline, nearly circular mass, or in an irregular patch spreading over the surface of the 
object to which it happens to be attached. As in the congeneric forms, there is often a 
small nucleus of spirally-arranged chambers. This is sometimes visible on the adherent 
face of the test, but more frequently it is placed nearer the centre, and can only be 
detected by means of sections (fig. 6), and in many cases it either does not exist or can- 
not be identified. But under all circumstances the chambers which constitute the bulk 
of the test, whether few, as in Schultze’s figure (loc. cit.), or very numerous as in the 
drawings now furnished, are combined irregularly and without dependence on any 
recognisable plan of growth. The chambers have no special stoloniferous orifices, and the 
test exhibits no general aperture ; and this peculiarity serves to distinguish the present 
