278 BRITISH FOSSIL CORALS. 
5. Ca@nires? STRIGATUS. 
Canttes srrigatus, M‘Coy, Ann. and Mag. of Nat. Hist., 2d ser., vol. vi, p. 280, 1850. 
= = M‘Coy, Brit. Palzeoz. Foss., p. 22, pl. ic, fig. 8, 1851. 
“ Corallum forming cylindrical, dichotomous branches, two to three lines in diameter ; 
surface with small, narrow, triangular cells, the base of the triangle below, and the apex 
usually more or less prolonged upwards into a vermiform channel, often upwards of half a 
line long ; four to five rows of cells in the space of one line measured transversely, about 
two in the same space measured longitudinally ; compact interstitial space between the 
rows of cell-openings usually rather exceeding their width. 
“Tn the Wenlock limestone of Dudley, Staffordshire.” M‘Coy, loc. cit. 
Family THECID A, (p. lxii.) 
Genus Tuxcta, ( p. lxii.) 
1. Toucta SwinpEerNana. Tab. LXV, figs. 7, 7a. 
AGARICIA SWINDERNIANA, Goldfuss, Petref. Germ., vol. i, p. 109, pl. xxxviii, fig. 3, 1829. 
_ — Morren, Descr. Cor. Belg., p. 46, 1832. 
Porites ExPaTIATA, Lonsdale, in Murchison, Silur. Syst., p. 687, pl. xv, fig. 3, 1839. 
—  Swinpernana, Bronn, Ind. Paleont., p. 1031, 1849. 
ASTREOPORA EXPaTIaTA, D’ Orbigny, Prodr. de Paléont., vol. i, p. 50, 1850. 
PaLtmopora? (THEcta) Expatrata, M‘Coy, Brit. Palzeoz. Foss., p. 14, 1851. 
Tuecia SWINDERNANA (Lntrod., pl. Ixili, 1850), Milne Edwards and Jules Haime, Pol. Foss. 
des Terr. Paleeoz. (Arch. du Mus., vol. v), 
p. 306, 1851. 
Corallum massive, subgibbose, not very thick; its under surface covered with a thin 
wrinkled epitheca, and sometimes free, sometimes adherent in the middle; upper surface 
covered with small superficial calices, which vary in size and form—the larger ones placed 
on the prominent part of the tuberosities, the other in the depressions; most of them 
circular, some polygonal; most of them confluent, some separated by a slight furrow. 
Septa varying in number from 12 to 18, well developed, rather thick, slightly flexuous, 
closely set, terminated by horizontal upper edge, and not extending quite to the centre of 
the calice, where a small shallow circular fossula is visible, but where we have not been able 
to discover any columella. These septa are somewhat unequal in breadth alternately, but 
are all of equal thickness, and are prolonged externally under the form of horizontal 
costal ridges. A vertical section shows that the visceral chambers are separated by an 
abundant compact spurious coenenchyma, resulting from the intimate union of the coste. 
