CORALS FROM THE CORAL RAG. 87 
nuda, which is very much like 7. ¢richotoma, by its general aspect, has also thinner and 
more numerous septa. 7. ramosa@ may also be distinguished from 7. axnularis by the 
regular form and small size of its calices. 7. gregaria’ differs still more from the prece- 
ding species by the corallites remaining in general grouped in fasciculi to a considerable 
distance from the parent calice, on which they were formed by fissiparous generation, a 
mode of arrangement which we have not met with in other corals of the same genus. 
M. D’Orbigny has recently given the name of Lasmosmilia’ to a certain number of 
fossil corals, which appear to us to be species of ZZecosmilia that have been accidentally 
deprived of their epitheca. The genus dmblophylia of the same author’ is founded 
on the existence of a rudimentary epitheca, and is probably composed only of speci- 
mens of the same genus less completely weatherworn. If the different species men- 
tioned under these two generical names were well characterised, it would be necessary 
for us to compare them with the British species described here above; but that is far 
from being the case. 
Genus RHABDOPHYLLIA.® 
Ruappopnyiuia Puinursi. Tab. XV, figs. 3, 3a, 30, 3c. 
CaryoruyLuia, Phillips, Ilustr. of the Geol. of Yorkshire, vol. i, p. 126, 1829. 
Lirnopenpron Epwarpstt, M‘Coy, Ann. and Mag. of Nat. Hist., s. 2, vol. ti, p.419, 1848; 
(but not Lithodendron Edwardsii of Michelin, as supposed by 
that author.) 
RuaBporHyLyuia Puriiurpst, Milne Edwards and J. Haime, Monogr. des Polyp. Paleeoz., &e., 
loc. cit., p. 83, 1851. 
Corallum composite, dendroid ; corallites tall, almost cylindrical ; slightly tumified at 
short distances, and becoming larger and somewhat compressed where they dichotomise. 
This division takes place frequently, and the newly formed branches diverge at an angle of 
about 50°. Coste very distinct, rather thick, granulose, almost equally developed, closely 
set, and often dichotomose (fig. 3a). The calices, when young, are regularly circular, as 
may be inferred from the form of the corallum, but the terminal portion of the branches was 
broken off in the specimens we have seen. A horizontal section, made at some distance 
1 D'Orbigny, Prod., t. i, p. 389. 2 Tb., p> 291. 
3 Tab. xxviii, fig. 1. 4 Note sur des Pol. Foss., p. 6. 
5 Note sur des Pol. Foss., p. 8. Amblophyllia rupellensis (D’ Orbigny, Prod. de Paldéont., vol. ii, p. 30,) 
is a species established for a cast, which does not appear to us susceptible of being characterised. 
Amblophyllia obtusa (D’Orbigny, Op. cit., vol. i, p. 285,) is known only by a very young specimen, in 
which the three calices are not yet become distinct, and present each about sixty septa belonging to three or 
four different cycla, and delicately dentate on the edge; but this species appears to differ from all others 
previously described by the loosely set prominent radiate strize that cover the sides of the septa. 
6 Milne Edwards and J. Haime, Polyp. Foss. des Terr. Palzeoz., &e., p. 83, 
