34 Messrs. W. K. Parker and T. R. Jones on the 
hemispherical knobs of this exogenous shell-matter quincuncially 
arranged over the whole surface, three or four cells being in- 
cluded in the area of each quincunx. This style of exogenous 
growth is also recognizable in some of the spherical lobeless 
individuals. : 
The bead-ornament suggests the name O. spherulata for this 
variety*. 
9. A still larger variety of the massive Orbitolina, having a 
sugar-loaf form, a flat or slightly concave base, and a diameter of 
+ inch, occurs fossil at Ciply (Belgium), in the uppermost 
Cretaceous series. It is much mineralized, but appears to have 
the same structure as the foregoing, including the erystalline 
knobs on the angles of the septa; but these clear beads are 
connected together by strings of granules of the same substance, 
small and variable in size, protruding on the edges of the septa. 
As a variety, this may be named O. spherulolineata. 
10. In the same deposit are somewhat smaller and globular 
specimens, in which the granular growth of the septal edges is 
still greater; so that continuous, rough, sinuous walls of division 
are produced, marking out irregular polygonal spaces, including 
one or more cells, the faces of which lie low down below the 
surface. Essentially similar septal projections constitute the 
limbate feature in Rotalia Beccarii, var. Schreteriana, and R, 
repanda, var. Carocolla. Similar globular Orbitoline (O. globu- 
laris, Phillips, sp.) are common in other Cretaceous deposits. 
Millepora? globularis, Phillips (Geol. Yorks. pl. 1. f. 12) and 
Woodward (Geol. Norf. pl. 4. f. 10-12), Tragos globularis, Reuss 
(Bohm. Kreid. p. 78, pl. 20. £.5), Coscinopora globularis, D’Orb. 
(Prodrom. ii. p. 284) and Morris (Cat. B. Foss. 2nd edit. p. 27), 
is our Orbitolina globularist. Michelin’s Ceripora Avellana (Icon. 
Zooph. p. 208, pl. 52. f. 13), from Sarthe, appears to us to be 
a large specimen of the same variety. Its probably adherent 
habit and perforated condition are not inimical to this view. 
* Denys de Montfort (Conch. Syst. i. p.146) has given a curious hybrid 
picture of his Triophorus baculatus, which consists of a three-spmed Orbi- 
tolina, according to its surface-ornament and its vertical section, but out- — 
lined apparently after a three-spined Calcarina. Spengleri, fig. e, pl. 15, in 
Fichtel and Moll’s ‘Test. Microsc.’ The indication of an aperture (the 
broken newest chamber in Calcarina) is also after F. & M. Its sectional 
aspects appear to have been taken, the vertical (Orbitoline) from nature, 
the horizontal (Calcarine) from Fichtel and Moll’s fig. k, with the sectional 
feature of the spine (also Calcarine) added from some other source. Some 
stellate form of O. spherulata may perhaps claim the name of.O. bacu- 
lata, Montf. - 
+ The characteristic structure is visible in some specimens preserved in 
the British Museum, and formerly in the collection of the late John 
Brown, Esq., of Starwway. 
