368 ME. T, P. SIBLY ON THE CARBONIFEROUS [May 1906, 



semi vesicular nature of its tabulae, in the absence of a purely- 

 vesicular peripheral area, and, finally, in the greater width, and the 

 more closely-vesicular nature, of the external area, radiated by both 

 series of septa. 



Campophyllids. 

 Campophyllum, Edwards & Haime. 

 See Vaughan, Quart. Journ. Geol. Soc. vol. lxi (1905) p. 276. 

 Campophyllum caninotdes, sp. nov. (PI. XXXI, figs. 2 a & 2b.) 



Form: cylindrical to cylindro-conical. Epitheca strongly 

 rugose. 



Horizontal section. — Outer wall strong, with its septal 

 projections equal to the total number of septa. Outer and inner 

 walls in contact at certain points, but otherwise separated by a 

 vesicular area. 



Vesicular area very variable in thickness, consisting of one or 

 two, rarely three or more, rows of large vesicles ; never continuously 

 radiated by the septa, but frequently showing septal projections. 



The primary septa, 45 to 55 in number, are thin, short, and all 

 approximately equal in length; they stop short of the centre, 

 leaving a wide, purely-tabulate area. 



Secondary septa generally developed, forming very short pro- 

 jections from the inner wall. 



The fossula is indicated by a slight inward shift of the tabular 

 intersections at one point of the ring, and is marked by one or more 

 shortened primary septa. 



Vertical section. — Tabulae well-spaced, continuous from side 

 to side ; flat throughout the central part, and bending sharply 

 downward within the septal zone. Outermost zone narrow and 

 variable, formed of one or two vertical rows of ascending vesicles. 



Remarks. — This species occurs very abundantly in the Upper 

 Syringothyris-Zcme, in certain parts of the Men dip area. 



The uniformly-developed, short septa, the very slight fossular 

 depression, and the strong outer wall, characterize the form under 

 description as a Campophyllum. In the irregular development of 

 the peripheral vesicular zone, however, this form shows a resemblance 

 to Caninia cylindrical mut. y ; hence the specific denomination. 



Resemblancesand di f f e r e n c e s. — Campophyllum MurcJiisoni, 

 Edwards & Haime, as represented in ' Monogr. Brit. Eoss. Corals ' 

 (Palseont. Soc.) pt. iii (1852) p. 184 & pi. xxxvi, fig. 3, differs con- 

 siderably from our form, in the following characters : — much larger 

 size, more numerous septa, the absence of a septal break, 1 and the 



1 These authors state that specimens of Campophyllum Murchisoni are in 

 the Bristol Museum. Through the kindness of Mr. H. Bolton, F.R.S.E., the 

 Curator of that Museum, I have had the opportunity of examining a specimen, 

 which agrees almost exactly with pi. xxxvi, fig. 3, of their monograph, but 

 possesses a septal break precisely similar to that shown by Campophyllum 

 canwoides. 



