152 Mr. Tate on the Berwichshire Mountain Limestone Fauna. 



witli other Ganoid fish, (not yet determined), plants, and large 

 Entomostraca allied to Estheria. Scales of S. Hihherti^ I 

 have also found in Shale at Cockburnspath. 



And here I may record the occurrence of a Gyracanthus in 

 sandstone belonging to the Tuedian group, a little southward 

 of Eoss, as a specimen was found there by Mr. Langlands, 

 the President, when the Club met at Ber^dck. This is a 

 spine of the dorsal ray of a cartilaginous fish, analogous to 

 that of the Spinax Acanthias — the I)og-fish of our coast. It 

 is not sufficiently perfect to enable me, as yet, to identify it 

 with any described species ; the fragment is arched, and 

 gradually tapers to a point ; it is six-and-a-half inches long, 

 and three-quarters of an inch broad ; the oblique ridges 

 covering the sides appear to be smooth. Three other species 

 occur in Northumberland : G. formosus (Ag.), at Amble in the 

 Coal Measures ; G. Alwicensis (Ag.), and G. oUiquus (McCoy), 

 in sandstone of the Mountain Limestone formation, Alnwick 

 Moor. G. olliquus has been found also on Langton Burn, 

 by Mr. Stevenson. 



Class— MOLLUSCA. 



CONCHIFEEA. 



Genus — Saxgtjinolites. McCoy. 



2. S. arcuata, Phil. G. Y. 2, t. 5, f. 4. 

 Pare in shale, Lammerton. 



8. S. variabilis, McCoy, Pal. Foss. t. 3 P., f. 6—8. 



"Pare in the Carboniferous Limestone of Berwick-on-Tweed." 

 McCoy. 



Genus — Schizodtjs. King. 



4. S. carhonarius, Sow. Geol. Trans, vol. 5, t. 29, f. 2. 

 In shale, Lammerton. 



5. 8. depressus, Port. Geol. Pep. t. 36, f. 8. 

 In argillaceous sandstone, Lammerton. 



Genus — ^Ntjcula. Lam. 



6. JV. gihhosa, Flem. = N. tumicla, Phil. G. Y. 2, t. 5. f. 15. 

 In shale above the limestone, Marshall meadows. 



Genus — Amttsium. Megerle. 



7. A. Sowerhji, McCoy, Carb. Foss. t. 14, f. 1, 

 In shale, Berwick. 



Genus — AvicuLO-PECTEisr. McCoy. 



8. A. pera, McCoy, Carb. Foss. t. 15, f. 19. 

 In argUlaceous sandstone, Lammerton. 



BRACHIOPODA. 

 Genus — Pkoductus. Sow. 



9. P. giganteus, Martin, Sow. M. C, t. 320; Phil. G. Y. 2, t. 



8, f. 5. 

 Common in limestone. Berwick, Marshall meadows and 

 Lammerton. 

 10. P. semi-reticulatus, Mart. Derb. t. 32, f. 1, 2. 

 In limestone, Berwick and Lammerton. 



