562 PKOP. E. J". GAEWOOD ON THE LOWEH CAEBONIEEROTJS [DeC. 1912^ 



development of the minor septa. Specimens having a length of 

 9"5 cm. and a diameter of 3*5 cm. across the calyx are not 

 uncommon. This form has been stated bj'' Dr. Yanghan to bear a 

 striking resemblance to CyathojyhyUum (p Yanghan.^ A transversa 

 section of a typical specimen from Gascow is here figured. 



Horizon and localities. — Abundant in the upper portion of 

 the Michelinia Zone in the IN'orth-Western Province ; Arnside and 

 Storth-E,oad section in the Arnside District ; Gascow and Plumpton 

 in the Furness District ; Park Head and Prith Hall in the Grange 

 District. 



CyATHOPHYLLUM MULT1LAMELLATU31 (M'Coy).- (PI. L, figS. 5-7.) 



The type-specimen of this species was obtained by M'Coy from 

 Arnside. The species occurs abundantly in the upper portion of 

 the Michelinia Zone — not only at Arnside, but wherever that 

 horizon is exposed. It is not found above that zone; but a closely 

 allied (though somewhat smaller) form is met with in the lower 

 portion of the zone, at Brigsteer in the Kendal District and else- 

 where. M'Coy's name is retained here, as the exact relation of this 

 form to C. murcMsoni (Ed. & H.) remains uncertain until the type 

 of that species is found and cut. There is, however, a certain 

 variation of the form in the different specimens collected from this 

 horizon. These may be divided into two groups: — Group A differs 

 both from C. murcliisoni and C. (p in having more widely-spaced 

 septa and a more strongly-marked fossula, while the tabulae are 

 intermediate in type between these two forms (figs. 6 & 7). This 

 form appears to be identical with M'Coy's C. multilamellatum, a 

 transverse section of which, cut from the type-specimen preserved 

 in the Sedgwick Museum, I am able to give for comparison through 

 the courtesy of Prof. McKenny Hughes (fig. 5). Group E contains 

 forms having still more widely-spaced septa and an even more 

 ^distinct cardinal fossula. 



Thysanophyllum pseudoveemiculare (M'Coy). (PI. XLIX, figs.. 

 2 a-2 d.) 



This species was originally described by M'Coy under the name 

 of Cyathopliyllum 2^seuclovermiculare^ from specimens collected in 

 the Kendal District.^ 



It is refigured here, in order to show (1) the great variation in the 

 size of the corallites and the characteristic lateral budding (fig. 2 a); 

 (2) the coarsely-ribbed epitheca (fig. 2 a); (3) the outer zone of 

 coarse vesicular tissue, which is typically not radiated by the septa, 

 except in young forms (fig. 2 h) ; and (4) the marked tendency for 

 one of the septa to be prolonged into the centre of the tabulate 

 area, as shown in figs. 2 6 & 2 c. 



This species would appear to belong to j^icholson & Thomson's. 



^ Geol. Mag. dec. 5, vol. v (1908) p. 70. 



2 ' British Paleozoic Rocks & Fossils ' 1855, pi. iii c, figs. 3 & 3a. 



' Ihid.^. 86&pl. iiic, fig. 8. 



