376 



MR. T. F. SIBLT ON THE CARBONIFEROUS [May 1906, 



Dibunophyllum-ZoriQ are somewhat fragmentary, but they appear 

 to be closely similar to the lower form. 



Spirifer cf. furcatus, M'Coy. 



The Men dip form, which occurs very abundantly at the base of 

 the Seminula-Zone at Cheddar, agrees very closely with M'Coy's 

 description and figure, in ' Syn. Carb. Limest. Foss. Ireland' 1844, 

 p. 131, and pi. xxii, fig. 12. It is very abundant at the same 

 horizon in the Weston-super-Mare district. 



Spiriferina. 



SPIRIFERLNA Cf. OCTOPLICATA (Sow.). 



= Spii-iferina octoplicata, Vaughan, Quart. Jcurn. Geol. Soc. vol. lxi (1905) 

 p. 300 & pi. xxvi, fig. 6. 



Syringothyris. 



Syringothyris aff. ctjspidata (Mart.). 



S. aff. ctjspidata, mut. K. 



= S. aff. cuspidata, Vaughan, Quart. Journ. Geol. Soc. vol. lxi (1905) p. 301. 

 S. aff. cpspidata, mut. C. 



= S. cuspidata, Vaughan, ibid. 



Camarophoria. 



Camarophoria isorhyncha (M'Coy). (PI. XXXII, figs. 5 a-h c.) 



M'Coy, ' Syn. Carb. Limest. Foss. Ireland' 1844, p. 154 & pi. xviii, fig. 8 

 (Atrypa- isorhyncha), & ' Brit. Pal. Foss.' 1855, p. 444 ; Davidson, 

 • Monogr. Brit. Foss. Brachiop.' (Palaeont. Soc.) vol. ii (1858-63) p. 117 & 

 pi. xxv, figs. 1-2 6. 



This species is 

 highly character- 

 istic of the base 

 of the Seminula- 

 Zone in some lo- 

 calities, namely, 

 Cheddar in the 

 Mendip area, and 

 the Weston-super- 

 Mare district. Our 

 specimens closely 

 resemble the fig- 

 ured type in general 

 form, dimensions, 

 and all essential 

 characters, but 

 differ in the pos- 

 session of a much 

 more prominent 

 mesial fold ; the fold invariably consists of four ridges, and the 

 sinus always contains three ridges. 



Fig. 2. — Pedicle-valve of Camarophoria 



isorhyncha, 



(Horizontal sections, natural size, showing the 



internal characters.) 



\ r 



dp dp* 



4 mm. below beak 5 mm. below beak 



dp 



9 mm. below beak 15 mm . below beak 



dp = dental plates forming the spondylium. 

 s = mesial septum. 



