366 BR. F, TOMES ON MADREPORARIA FROM THE LIAS OF 
THECOsMILIA TERQUEMI, Duncan, loc. cit. p. 16, pl. iii. figs. 7-12. 
Prof. Duncan’s description of this species was taken from Bro- 
castle specimens in Mr. Moore’s collection; but he afterwards 
figured some very immature Thecosmilie from my own collection, 
taken from the “ Guinea” bed of Binton; and as these latter were 
actually found attached to and growing upon shells forming the 
upper or exposed surface of the bed, there can be no doubt whatever 
about their horizon. But the low septal number which charac- 
terizes them is quite as probably the mere result of immaturity as 
of their identity with a species which possesses, even with greater 
age, only a few septa. 
TueEcosmIL1A Broprer, Duncan, loc. cit. p. 13, pl. x. figs. 1-4. 
I am only acquainted with this coral by a very cursory examina- 
tion of the type specimen. Its calicinal peculiarities distinguish it 
as a species; but there seems to be little evidence of its generic 
claims. 
THECOSMILIA DENTATA, Duncan, loc. cit. p. 16, pl. iv. figs. 21-23. 
So far as can be ascertained from the examination of the type 
specimen, which is not, however, a very satisfactory one, the present 
species possesses more strongly marked specific characters than some 
of the other species of Thecosmilic, occurring also in the Brocastle 
conglomerate, which have a smaller number of irregular and ill- 
developed septa. 
Tuecosmitia Duncant, Tomes, 
Thecosmilia irreqularis, Duncan, loc. cit. p. 15, pl. i. figs. 1-6 
(not pl. x. fig. 5), not Thecosmilia wrregularis, Laube, loc. cit.p. 257, 
Taf. 6. fig. 6. 
Like so many (probably all) of the Brocastle Thecosmilie, the 
present species increases by fissiparity. Figure 5 of plate x. of the 
work above quoted, represents a coral which I cannot regard as 
identical with the one figured on plate ii. under the same name, - 
either specifically or generically. The very remarkable form shown 
on plate x. is, I have no doubt, the result of excessive and repeated 
rejuvenescence. J have seen precisely the same thing happen, 
though not in the same degree, in Montlivaltia rugosa, and I 
possess specimens of the latter species which show that when the 
sudden contraction takes place, the epitheca advances and obliterates 
the calice, leaving uncovered only a circular space of greater or less 
extent, from which afterwards arises the new portion of the coral- 
lite. This is precisely what has taken place in the specimen attri- 
buted to the present species, in which, as may easily be observed in 
the figure, the upper or final calice has become covered by a thick 
and wrinkled epitheca. As the specific name irregularis had been 
already made use of, the name of Duncani may be here applied to 
the present species. 
