16 FORAMINIFERA OF THE CRAG. 
earliest of Miliola, if not the first of all in pomt of time. A feeble variety of the form 
now under consideration is found in the Lower Lias Clay of Warwickshire ; and it occurs, 
associated with the other Mcliole, in nearly if not quite all the Tertiary strata that yield 
Foraminifers. 
It is a very common form at all depths in the British seas, and partakes of the cosmo- 
politan character of the other sub-typical forms of the family. 
2. SPrROLOCULINA CANALIcULATA, D’Orbigny. Plate III, figs. 39, 40. 
SprroLocutina cymBiuM, D’Orb., 1839. Foram. Canar., p. 140, pl. 3, figs. 5, 6. 
— cANALIcuLATA, Id., 1846. For. Foss. Vien., p. 269, pl. 16, figs. 10—12. 
— LIMBATA, Bornemann (non D’Orb.), 1855. Zeitsch. Deutsch., Geol. Ges., 
vol. vil, p. 44, pl. 8, fig. 1; Reuss, 1863, Sitz. Akad. Wien., 
vol. xlviii, p. 64, pl. 8, fig. 89. 
— DEPRESSA, et var. CYMBIUM, Williamson, 1858. Ree. For. Gt. Brit., p. 82, 
Dlov/s AER. 177, 179: 
— CANALICULATA, Parker and Jones, 1862. App. Carpenter’s Introd. For., 
p. 312, pl. 6, fig. 2. 
Characters. —Segments arranged as in the other Spiroloculing. Lateral faces of the 
chambers concave, in extreme examples the peripheral margins bearing a groove due to 
the prominence of the marginal ridges. Length, jth inch. 
We prefer retaining the trivial name used in D’Orbigny’s Monograph on the Foramini- 
fers of the “ Vienna Basin,” in preference to the earlier one employed in his work on the 
Foraminifera of the Canaries, inasmuch as the figures to which it is applied indicate a shell 
of medium growth, and therefore more typical in character, and a better representative of 
the little group to which both varieties pertam. The figured variety in the latter work, 
Sp. cymbium, is one of the feeble and perhaps transitional forms, concerning many of 
which it is difficult to say whether they belong to the Spiroloculine or the Quinqueloculine 
sub-types. In Sp. canaliculata each chamber is more or less bi-concave; and in its 
extreme development the marginal ridges become very prominent, producing a well- 
marked marginal groove on the peripheral edge of the shell. 
In the Lower Crag of Sutton we have many large specimens; but we are not able to 
speak of its occurrence in the Crag of other localities. Recent specimens are not 
uncommon; indeed, it may be said to occur wherever Spiroloculine JMliole are 
found, whether in shallow seas, or in fossiliferous beds formed under similar cir- 
cumstances. 
