MILIOLIDA. { 13 
varieties, not far removed from the transitional forms above alluded to; the ridged marginal 
border being almost the only character connecting it with Q. Ferussacit. 
It is very difficult, therefore, if not impossible, to define the limits of this variety, which 
passes into the true Q. seminulum on one hand, and into several varieties (of little value) on 
the other. ‘The synonyms above given are merely a selection. 
Stout-ribbed Quinqueloculine are not uncommon wherever the other Ailiole exist, 
though they seldom occur in any great abundance ; we find their shells also in fossiliferous 
‘Tertiary strata in the neighbourhoods of Paris and in the Vienna Basin. In the Crag we 
only note its occurrence at Sutton. 
6. QUINQUELOCULINA PULCHELLA, D’Orbigny. Plate IV, fig. 3. 
QUINQUELOCULINA PULCHELLA, D’Orb., 1826. Ann. Sc. Nat., vol. vii, p. 303, No. 42; 
Soldani, Testac. ac. Zooph., vol. iv, p. 53, pl. 18, 
figs. c and f. 
— VERNEUILIANA, SCHREIBERSII, JosEpHIANA, Id., 1846. For. Foss. 
Vien., p. 296, pl. 19, figs. 19—27. 
_— PULCHELLA, Brady, 1864. Trans. Linn. Soc., vol. xxiv, p. 466, pl. 48, 
fig. 4. 
Characters—Shell traversed by several stout parallel longitudinal coste. Segments 
arranged as in the other Quinqueloculine. Colour white, dirty-white, or brownish. 
Length, 3th inch. 
The varying conditions of the surface of the shell in respect to texture and orna- 
mentation are among the least of the secondary characters on which the artificial sub- 
division of the Milioline groups may be founded. These characters cannot boast any 
greater permanency than we have ascribed to those on which the larger divisions have 
been determined. The texture of the normally porcellanous Foraminiferal shells may, 
under altered circumstances, present every gradation from white and smooth to brown, 
rough, and purely arenaceous ; and the surface-markings, which so many species exhibit, 
are seen in every degree of intensity, from delicate hair-like strize and fine mblets, 
to deep sulcations and bar-like ribs. But, whilst it isimpossible to draw any defined limit 
between these different forms of ornamentation, they are sufficiently strikimg in their 
external development to yield a ready means of dividing what would otherwise be a some- 
what unwieldy and heterogeneous collection of forms. 
The bold and strongly ribbed Quinqueloculina pulchella is not a common shell; and 
only a single specimen has occurred to us in our examination of the Foraminifera of the 
Crag. ‘This specimen, from Sutton, is in Mr. Searles Wood’s collection; and although it 
is broken and much worn, we have no hesitation in assigning it to this sub-species. On 
the British coast, Q. pulchella is a very rare form; but it is more frequent in the Mediter- 
ranean, and in tropical seas. It is occasionally found in the Tertiary fossiliferous deposits, 
but does not appear before the Grignon Beds of the Paris Basin. 
