2 BRITISH FOSSIL CORALS. 
Orver ZOANTHARIA (p. ix). 
Family TURBINOLIDD (p. xi). 
Tribe TURBINOLIN & (p. xvi). 
Genus SPHENOTROCHUS (p. Xvi). 
|, SPHENOTROCHUS INTERMEDIUS. ‘ab. I, figs. 1, 1 a—li. 
TURBINOLIA INTERMEDIA, Miinster, 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. 
_ . . . . RR. C. Taylor, in Mag. of Nat. Hist., vol. iti, p. 272, fig. 2, 
1830. (A rough figure.) 
— INTERMEDIA, Milne Hdwards, Notes in the second ed. of Lamarck’s Anim. sans 
Vert., vol. ii, p. 361, 1836. 
_ — Galeotti, Mém. couron. par l’Acad. de Bruxelles, vol. xii, p- 188, 
1837. 
— Hagenow, in Neues Jarhb. fiir Miner. Geol., 1839, p. 291. 
— — Nyst, Coquilles et Poly. foss. des Terr. Tert. de la Belgique, 
p- 631, tab. xlvin, fig. 14, 1843. (This figure is incomplete, 
and does not show the columella.) 
— Mitetrana, 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™° série, 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. 1a). This last character exists also in the Spheno- 
trochus Milletianus ; but this Coral, instead of bemg much compressed in the lower part, 
is, on the contrary, very thick down to its extremity. 
Coste smooth, rather thick, especially near the calicular edge, closely set, but separated 
by deep grooves (fig. 14). 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 papille. 
The median costé are nearly straight, nearly equal, not very prominent, and narrowing as 
they approach the base; the lateral costa, 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. 
