16 FORAMINIFERA OF THE CRAG. 



earliest of Miliol^, if not the first of all in point of time. A feeble variety of the form 

 now nndcr consideration is found in the Lower Lias Clay of Warwickshire ; and it occurs, 

 associated with the other Miliola, 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. Spiroloculina canaliculata, lyOrUgny. Plate III, figs. 39, 40. 



Spikoloculina cymbium, B'Orb., 1839. Foram. Canar, p. 140, pi. 3, figs. 5, 6. 



— CANALICULATA, Id., 1846. For. Foss. Vieii., p. 269, pi. 16, figs. 10—12. 



— LiMBATA, Borneniann (non D'Orb.), 1855. Zeitsch. Deutsch., Geol. Ges., 



vol. vii, p. 44, pi. 8, fig. 1 ; Reuss, 1863, Sitz. Akad. Wien., 

 vol. xlviii, p. 64, pi. 8, fig. 89. 



— UEPHKSSA, et var. cymbium, Williamson, 1858. Rec. For. Gt. Brit., p. 82, 



pi. 7, figs. 177, 179. 



— canaliculata, Parker and Jones, 1862. App. Carpenter's Introd. For., 



p. 312, pi. 6, fig. 2. 



Characters. — Segments arranged as in the other SpiroIocuHna;. Lateral faces of the 

 chambers concave, in extreme examples the peripheral margins bearing a groove due to 

 the prominence of the marginal ridges. Length, ,',th 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 medimn growth, and therefore more typical in character, and a better representative of 

 the little group to which both varieties pertain. The figured variety in the latter work, 

 Sp. cpnhium, 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. canaJiculafa 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 MUiolce are 

 found, whether in shallow seas, or in fossiliferous beds formed under similar cir- 

 cumstances. 



