chief Generic Types of Palceozoic Corah. 69 



doubt as to whether it may not be in part conterminous with 

 Campophyllum as well as with Amplexus. The forms recently 

 referred to Cahphyllum by Dybowski (Mon. der Zoanth. scler. 

 rugosa, pp. 118-121) are partly simple and partly compound, 

 and are certainly not referable either to Gampopliyllum or 

 Amplexus. We have, however, no means of judging to what 

 extent they can be regarded as representing the forms referred 

 by Dana to Calophyllum. There exists, however, in the 

 Carboniferous rocks of Scotland, a group of corals which stand 

 intermediate between CamjyophyUum on the one hand and 

 Amplexus on the other. They differ from the former in having 

 no well-defined exterior zone of vesicular tissue, and from the 

 latter in the much greater development of the septa, which 

 only leave a small central area of the tabula? exposed. Whether 

 the name of Calophyllum can with propriety be retained for 

 such forms we leave at present an open question ; but we have 

 figured a few examples for purposes of comparison. 



As at present constituted the genus Campophyllum contains 

 only simple corals. There would, however, be some reason 

 for removing Cyathophyllum paracida^ M' Coy, from its present 

 genus, and referring it to Gampophyllum^ as suggested by 

 Milne-Edwards and Haime (Pol. Foss. des Terr. Pal. p. 395). 

 The ground for such a change is that the septa in this species 

 appear never to reach the centre of the visceral chamber, but 

 always leave a portion of the tabula? exposed ; whereas in the 

 typical Cyathophylla the septa meet in the centre. If this 

 change were to be accepted, then Campophyllum would con- 

 tain compound as well as simple forms. Cyathophyllum gigan- 

 teum {=Zap)hrentis cylindrica) would also have to undergo a 

 similar transference. We do not, however, feel justified in 

 adopting this alteration with the evidence at present in our 

 possession. 



The genus Campophyllum is mainly Devonian in its range ; 

 but it also extends into the Carboniferous system, where it is 

 represented by at least one species {^Campophyllum MureMsoni^ 

 E. & H., PI. VI. figs. 3, 4, & 4 A). 



EXPLANATION OF THE PLATES. 



(All the specimens are figured of the natural size.) 



Plate VI. 



Fia 1 Cyathoiihyllmn ( Caninia) gujanteum, Mich., outline of the corallum 

 of a large individual, from Auchenskeoch Quarry, near Dairy, 

 Ayrshire (Lower Carboniferous) ; 1 a, longitudinal section of 

 the upper portion of another individual of the same, from the 

 Lower Carhonifeious of Bathgate, Linlithgowshire; 1 B-1 1, 



