2 BRITISH FOSSIL CORALS. 



Order ZOANTHAEIA (p. ix). 

 Family TURBINOLID^E (p. xi). 

 Tribe TURBINOLINyE (p. xvi). 



Genus Sphenotrochus (p. xvi). 

 1. Sphenotrochus intermedius. Tab. I, figs. 1, 1 a — 1 i. 



Turbinolia intermedia, Munster, ap. Goldfuss, Petref. Germ., vol. i, p. 108, tab. xxxvii, 



fig. 19, 1826. (This figure is good, excepting that the basis of 

 the Coral appears too truncate.) 



— — Ch. Morren, Descrip. Corall. foss., in Belgio Repertorum, p. 52, 



1828. 



— . . . . R. C. Taylor, in Mag. of Nat. Hist., vol. iii, p. 272, fig. 2, 



1830. (A rough figure.) 



— intermedia, Milne Edwards, Notes in the second ed. of Lamarck's Anim. sans 



Vert., vol. ii, p. 361, 1836. 



— — Galeotti, Mem. couron. par l'Acad. de Bruxelles, vol. xii, p. 188, 



1837. 

 — Hagenow, in Neues Jarhb. fur Miner. Geol., 1839, p. 291. 



— — Nyst, Coquilles et Poly. foss. des Terr. Tert. de la Belgique, 



p. 631, tab. xlviii, fig. 14, 1843. (This figure is incomplete, 

 and does not show the columella.) 



— Milletiana, Searles Wood, Ann. and Mag. of Nat. Hist., vol. xiii, p. 12, 1844. 

 Sphenotrochus intermedius, Milne Edwards and Jules Haime, Monogr. des Turbinolides, 



Ann. des Sc. Nat., 3 me serie, vol. ix, p. 243, 1848. 



Corallum simple, straight, free, presenting no trace of adherence, cuneiform, strongly com- 

 pressed in its lower part, and truncate at its basis, which is very broad (fig. 1) ; sometimes 

 even as much so as the calice (fig. la). This last character exists also in the Spheno- 

 trochus Milletianus ; but this Coral, instead of being much compressed in the lower part, 

 is, on the contrary, very thick down to its extremity. 



Costa smooth, rather thick, especially near the calicular edge, closely set, but separated 

 by deep grooves (fig. \b). They all occupy almost the whole length of the corallum ; and 

 it is therefore difficult to recognise their relative age by the height at which they begin. 

 This difficulty is also augmented by the form of those situated near the middle of the 

 flattened sides, which in their lower part are constituted by small, rather irregular papillae. 

 The median costse are nearly straight, nearly equal, not very prominent, and narrowing as 

 they approach the base; the lateral costse, and those situated near them, are, on the 

 contrary, larger, separated by deeper grooves, slightly curved towards their lower end, 

 sometimes rather undulate, and thicker at their base than higher up. 



