CORALS FROM THE MOUNTAIN LIMESTONE. 201 
conical and the columella small. Z. affine is remarkable for the turbinate form of the 
young corallites, the existence of a well-marked septal fossula, and the abundance of the 
interseptal vesicles. The coexistence of these characters distinguishes it sufficiently from 
all the other species. 
13. Litnosrrorion Paruuirsi. Tab. XXXIX, figs. 3, 3a. 
LITHODENDRON FascicuLaTuM, Keyserling, Reise in Petsch., p. 170, pl. iii, fig. 2, 1846. 
(Not Phillips.) 
Lirnostrotion Puriiirsi, Milne Edwards and Jules Haime, Pol. Foss. des Terr. Palieoz., 
p. 439, 1851. 
Corallum fasciculate, much resembling Z. Martini,’ but differing from it by the 
frequent coalescence of the corallites, which unite laterally, so as to form small rows, 
somewhat as in the Halysites. There appears to be about 30 septa. Colwmel/a somewhat 
compressed. Diameter of the calices about 4 lines. 
Found in Ireland and in Russia. The specimen figured in this Monograph belongs to 
the collection of Mr. Stokes. 
The flexuous form of the corallites, and their mode of partial union by means of 
longitudinal sutures, distinguish this species from all the other fasciculate Lithostrotions. 
14. Lirnostrotion (?) DerBrense. 
STYLASTREA IRREGULARIS, M‘Coy, Ann. and Mag. of Nat. Hist., 2d ser., vol. iii, p. 9, 1849. 
LirHostRotion (?) Derpirensn, Milne Edwards and Jules Haime, Pol. Foss. des Terr. Palzoz., 
p- 445, 1851. 
STYLAXIS TRREGULARIS, M‘Coy, Brit. Paleeoz. Foss., p. 101, pl. iii a, fig. 5, 1851. 
This fossil is very imperfectly known, having been found only in a very bad state of 
preservation. The Corallites are irregular and bent in zigzags ; the Calices are polygonal ; 
the sept flexuous, about 30 in number, rather unequal in size alternately. Zadule 
broad and almost horizontal ; exterior zone accompanied by two or three rows of vesicular 
dissepiments. Diameter of the corallites 2 lines. Found in the carboniferous limestone 
of Derbyshire. 
15. LirHostrorion MAJor. 
STyLaxis Magor, M‘Coy, Ann. and Mag. of Nat. Hist., 2d series, vol. iii, p. 120, 1849. 
— Milne Edwards and Jules Haime, Polyp. Foss. des Terr. Palzoz., 
p. 454, 1851. 
— M‘Coy, Brit. Paleeoz. Foss., p. 101, pl. iii a, fig. 4, 1851. 
1 See tab. xl, fig. 2. 
