﻿Vol. 64.] Ilf THE CAEBONIFEROTJS EOCKS AT LOUGHSHINNY. 461 



Diphyphyllnm. 



DiPHYPHYLLUM SUBIBICINUM (M'Coy). (PI. XLIX, fig. 7.) 



Caninia suhibicma, M'Coy, ' Brit. Palasoz. Foss.' p. 89 & pi. iii i, fig. 35. 



Form elongate and cylindrical. Tabulae broad and flat, without 

 columella. Fossula very shallow and inconspicuous. 



The septa and the external vesicular area are Lithostrotion-like ; 

 the major septa fall considerably short of the centre, the minor 

 septa project inwards beyond the ring of vesicles, and all the septa 

 are of the same thickness. 



This species is essentially a large Lithostrotion without a 

 columella, and is therefore a good example of the genus Dipliy- 

 pliyllum. 



Differences. — CijatJiopliyllum giganteum (Mich.), Thorns. & 

 jSTich, op. cit. vol. xvii, pi. vi, fig. 1, diifers in the feeble develop- 

 ment of the minor septa and in the more advanced (Clisiophylloid) 

 character of the vesicles. 



JD. suhibicinum is abundant in the Holmpatrick Limestone, where 

 it is associated with Campopliyllum Murchisoni, Ed. & H. 



In the South- Western Province it occurs commonly in D^ with 

 the same associate, llr. Cosmo Johns, F.G.S., has sent me a few 

 specimens from the Basal Conglomerate of Ingleboro' (SJ, and this 

 is the earliest record of the species. Dr. Wheelton Hind has col- 

 lected it from the Derbyhaven Limestone (Isle of Man). M'Coy's 

 figured specimen came from Kendal, and is almost certainly 

 from C-S^.^ 



Koninckophyllum. 



KONINCKOPHYLLUM Sp. . (PI. XLIX, fig. 14.) 



Cf. Koninckophyllum interrioptum, Thorns. & Nicli. op. cit. vol. xvii, p. 303, 

 pl. xii, fig. 3 (a species characterized by its discontinuous columella). 



There are two specimens in Dr. Matley's collection, both of which 

 probably belong to the same species. 



The fragment from L 7 shows no columella, whereas the figured 

 specimen from L 12 (/ exhibits this character clearly. Both speci- 

 mens are from approximately the same level in P. 



The densely-packed vesicles distinguish the later and typical 

 Koninckopliylla from the earlier and more LitJiostrotion-\\kQ 

 forms typified by Koninchopliyllum 6, Vaughan. The .partial dis- 

 appearance of the columella indicates a further stage in evolution. 



In the South-Western Province, highly-developed Koninclco- 

 p)JiyUa do not appear before D^, and all the species are continuously 

 columellate. 



A similar form occurs at Astbury (Staff's.) in the volcanic beds, 

 which are referred by Dr. Wheelton Hind to the P level. The 

 specimens figured by Thomson & Nicholson were obtained from 

 the Lower Limestones of Scotland. 



^ The Michelinia-megastoma Bed of Prof. E. J. Garwood, Geol. Mag. dec. 5, 

 Tol. iv(iy07)p. 70. 



