Vol.51.] EABIOLARIAN ROCKS IN THE LOWER CUXM MEASURES. 649 



lateral spine. The ribs are rounded and separated by deep furrows ; 

 the axis is somewhat narrow ; the pygidium seems to consist of from 

 6 to 7 coalesced segments, its axis is bluntly triangular, is marked 

 on either side by a parallel groove, and does not extend to the 

 posterior border. The ribs on the lateral border, which are 6 in 

 number, die away leaving a smooth margin. 



Breadth of head at the neck-furrow 6 mm., length 5 mm., breadth 

 of cheek 2*5 mm. Length of five thoracic segments following 

 the head 4*5 mm., breadth 5 5 mm. Pygidium with three thoracic 

 segments united to it 5 mm. ; pygidium alone, length 2*5 mm., 

 breadth 4*5 mm., width of axis at tail 2 mm. 



In white siliceous rock from the Combe Wood Quarry, near Barn- 

 staple. Collected by Mr. J. G. Hamling. 



(e) Brachiopoda. By F. A. Bathek, Esq., M.A., F.G.S. 



Mr. Bather has kindly examined for us the brachiopoda from the 

 Radiolarian (Codden Hill) Beds, and has supplied us with the 

 following notes on their identification: — 



Distinct, nitida, Phillips, sp. 



1836. Orbioula nitida, ' Geology of Yorkshire,' vol. ii. p. 221, pi. xi. figs. 10-13. 



1857. Discina nitida, Davidson, ' Brit. Carbonif. Brachiop.' Pal. Soc. vol. ii. pt. v. 

 p. 197, pi. xlviii. figs. 18-25, p. 268. 



1874r-82. , ' Brit. Carbonif. Brach. Suppl.' vol. iv. p. 268, pi. xxx. figs. 12 



&13. 



A rather imperfect specimen, apparently of this species. At any 

 rate it differs from the species of Discina described by Holzapfel 

 from the Lower Carboniferous of Liebstein (Pal. Abhandlung. n. s. 

 vol. i. 1889, p. 67) and from Discina marginata, Sandberger, which 

 Sarres recorded from the Culm of Aprath. Length 12 mm., width 

 9 mm. 



From Codden Hill Quarry (coll. J. G. Hamling). It is widely 

 distributed also in the Carboniferous Limestone of Yorkshire, Scot- 

 land, Ireland, etc. 



Productus plicatus, Sarres. PI. XXVIII. figs. 10, 10 a, & 10 b. 



1857. ' Inaugural Dissertation,' p. 20. 



1882. Kayser, Jahrb. d. konigl. Preuss. geol. Landesanst. f. 1881, p. 81, pi. iii. 

 figs. 1 & 2. 



The specimens are smaller and finer than those described by 

 Sarres and Kayser, while the ears seem to project a little more. 

 Spines are only shown in one specimen. Kayser compares the 

 species with P. Oarringtonianus, Davidson ; but that is a larger, 

 coarser, and more vaulted form. There is no other British species 

 with which comparison is possible, but the P. concentricus of Sarres 

 is clearly, as Kayser says, a very close ally. Length 5 mm., breadth 

 8 mm. 



From Hannaford Quarry, near Barnstaple. Also from the Lower 

 Culm at Aprath, Rhenish Prussia. 



