﻿464 DR. A. VAUGHAN OX THE PATJXAL SUCCESSION [Aug. I908, 



Carcinophyllum. 



Carcin-ophtllum ourkeenense, sp. nov. (PI. XLIX, fig. 5.) 



Porm cjiindro-conical, with smooth epitheca. 



Horizontal section. — The central area is circular and sharply 

 delimited ; it is composed of a thick irregular diametral columella, 

 from which ten or twelve thick, irregular, and knotted lamellae 

 radiate and fill up almost the whole of the area. The medial area 

 is radiated by thirty (at a diameter of 15 millimetres) short and 

 stout major septa; the minor septa do not project into this area. 

 The external area is a dense thick ring, formed by the perfect 

 approximation of the major and minor septa, which are of equal 

 thickness and in complete contact. There is some indication of a 

 narrow peripheral ring of loose structure. 



This species presents structural characters intermediate between 

 those of forms from Lower S and Upper D. In Lower S of the 

 Mendips and Tenby a closely-similar form occurs, which differs in 

 the distinct separation of the septa in the external ring. In 

 D.J of Cracoe a similar form was collected, in which thin prolonga- 

 tions of the minor septa into the medial area were conspicuously 

 shown. 



The figured specimen is from the DibunophyUum-IAmestoiie (D,), 

 and certain ill-defined corals from the Curkeen Limestone probably 

 belong to this species. 



Lonsdaloid Carcinophyllum. (PI. XLIX, fig. 12.) 



This degenerate form is probably an old-age derivative from the 

 preceding species. 



The regularity of the external ring is broken down, and this area 

 is now composed of the knobbed and bulbous bases of the septa. 

 The peripheral area is enlarged, and occupied by irregularly 

 anastomosing offshoots of the septal series. 



Specimens are not uncommon in the lower part of P. 



Dr. Wheelton Hind has collected the same form from the ' Knoll ' 

 level of Poolvash (Isle of Man). 



A New Genus of Clisiophyllid.' (Fig. 16, p. 465.) 



I have only seen three incomplete specimens of this interesting 



coral: — one from the top of the Limestone-massif at Wetton 



^Derbyshire) ; the second from the Ci/athcLvonia-Beds of Eush 



■^R 18 e, ' Rush paper ' p. 299 — there described as an ' Aulophylloid 



^ In the original definition of Cli m>phyll um (Dana in ' Narr. U.S. Explor 

 Exped.' 1838-42, vol. vii, Zoophytes, p. 355 & pp. 361, 362) the following 

 characters are clearly suggested as diagnostic: — (1) xaulted tabulae; (2) no 

 columella; and (3) an external ring of radiated vesicles. Our new genus 

 agrees with Clisiophylhim, Dana, in characters (1) and (2), but differs markedly 

 in the absence of (3). The present-day conception of Clisio'phyllum as a 

 columellate coral is apparently unwarranted. 



