558 James Thomson — New Carboniferous Corals. 



convex plates ; while the outer area, or interseptal spaces, is filled up 

 with minute convex dissepiments. Convexity upwards and outwards. 

 . This coral equals in size what has been termed ZepJirentis cylin- 

 drica, and has even been classified as such. If, however, sections 

 are made and examined, it is clearly seen to be excluded from all 

 existing genera. It is dedicated to that indefatigable explorer of 

 Ayrshire fossil-beds, and excellent geologist, Mr. Robert Craig. 

 He has uniformly aided me by assiduously laying aside many speci- 

 mens which otherwise would have been buried in the quarry debris, 

 and I beg to offer him my thanks for all his kindness. 



Height of corallum 10 in. ; diameter of calico 2 in. Position 

 near the base of the Carboniferous Limestone, in a thin bed of shale, 

 in Trearn Quarry, near Beith, Ayrshire. 



Bodopliylliim Slimonianum, Thomson, sp. nov. PL XX. Fig. 2. 



Specific characters. — Corallum cylindro-conical, curved, with small 

 accretion ridges. Calico circular. Septa 44 primary, which at their 

 inner margin, and for half their length, are more or less clavate, 

 and cellular. The septa on the outer half, passing to the wall, are 

 thin and flexuous, with an equal number of long, slender secondary 

 septa which pass inwards more than half the length of the primary 

 septa. Each is laterally united by numerous angular dissepiments. 

 The fossula has three short septa in it, and a portion of the endotheca 

 of the central mass passes into it. The specimen, being only a 

 fragment, does not warrant me in giving more details; but the 

 clavate termination of the primary septa clearly excludes it from 

 any known species. 



Height of corallum unknown ; diameter of calico 2 in. 5 lines ; 

 diameter of columellarian space 1 in. The specimen was found at 

 Brockley, Lesmahagow, in the lower beds of the Carboniferous 

 Limestone, by Mr. Eobert Slimon, Surgeon. He has long and 

 carefully worked out the geology of the upper ward of Lanarkshire. 

 To him I owe the use of the specimen, and I dedicate the species 

 to him. 

 Bodophjllum simplex, Thomson, sp. nov. PL XX. Figs. 3 and 3a. 



Specific cliaracters. — Corallum turbinate, curved. Calice mode- 

 rately deep and circular. Columellarian boss rotund, and crowned 

 with sub-convolute lamellae. Septa not very well defined — the 

 specimen being imperfect, I have no data to determine exactly their 

 number and arrangement. The epitheca and septa are eroded away 

 on the concave side by atmospheric agencies. If, however, these 

 details are wanting, we are compensated by having the columellarian 

 boss exposed to near the lower extremity of the coral, and this 

 enables us to form a correct idea of its form, and of the arrange- 

 ment of the lamellae. It is rotund in outline, and resembles an 

 unexpanded rose-bud. 



Height of corallum about If in. The coral is found at Brockley, 

 Lesmahagow, in a band of shale interstratified between thin beds of 

 Limestone, and is associated with numerous other corals. 



