Vol. 67. J THE CARBONIFEEOUS SUCCESSION IN GOWEB. 557 



This species appears to be intermediate between Amplexus and 

 Caninia — in fact an Amplexus above the tabulae and a Caninia 

 below : a Caninia in form, an Amplexus in calyx. 



The few specimens that I have seen from Oystermouth were col- 

 lected by Mr. Underhill from the base of D 2 _g in North Colts Hill 

 Quarry. 



Mr. H. F. Barke, A.I.C., has collected from y at Burrington a 

 similar coral having the general form, the short septa, the broad 

 steeply-sloping tabulae, and the inconspicuous fossula of the species 

 under description. The earlier coral is, however, Amplexoid 

 throughout, and its minor septa are practically undeveloped in the 

 calyx. 



Amplexus. 



Amplexus (?) sp. (PI. XL, figs. 6 a & 6 b.) 



Form cylindro-conical, the junction of the cylindrical and conical 

 portions being abruptly marked by an extremely strong growth- 

 halt and by a change of axial direction. 



The epitheca has the strong girth-ridges characteristic of 

 Amplexus nodulosus Phill., but there are no spines. 



The septa are long, widely spaced, and about 20 in number. 



In the figured section (fig. 6 b) the septa extend much farther 

 towards the centre than is the case in the small Amplexids so 

 common at this level in northern localities {A. nodulosus Phill., etc.), 

 and they again differ very remarkably in their inequality. It is, 

 however, to be noted that sections differently situated with regard 

 to the tabulae exhibit a series of equal septa which fall short of the 

 centre, and only differ from those of A. nodulosus in their greater 

 length. 



The tabulae are strong, distant, tall arches, flattened or gently 

 convex above and sharply bent down near the wall. 



The species is rare in D 2 _ 3 of Oystermouth Quarry, where it takes 

 the place of A. nodidosus, which is common at the same level in 

 other localities. 



This species differs from A. nodulosus Phill., de Kon. 1 in its 

 septal plan (as explained above), in its few distant tabulae, and in 

 the small number of its girth-ridges. 



CLISIOPHYLLIDS. 



Dibunophylluni. 



Dibuxophyllum Q Yaughan, and an early form of Dibtjnophylltjm \p 

 Yaughan. (PI. XL, fig. 7.) 



The figured specimen is from B 1 of Port Eynon ; it shows a 

 cross-section of two cylindrical Dibunophylla, side by side. 



1 ' Nolit. Rech. Anim. Foss. Terr. Carb, Belg.' 1872, p. 74 & pi. vi, fig. 5. 



2q2 



