634 FAUNAL SUCCESSION OF THE UPPER BERNICIAN 



Clisiophylloid Lithostrotion. — Thin septa, as in Lithostrotioti, 

 in the narrow external area. The central area is composed of 

 a trabecLilate columella entirely surrounded by a mesh of 

 lamellae and concentric intersections. Common in Dr of the 

 South-West Province ; not uncommon in the Redesdale 

 Limestone. (Plate xvi., fig. 10). 



Favositids. 



Palceacis cyclostoma (Phill.) — I obtained a number of these 

 corals, each attached to the back of a Chonetes, from the base 

 of the shale overlying the Great Limestone at the quarry close 

 to High Whittle. Edwards and Haime in their monograph 

 on Carboniferous corals (Pal. Soc, vol. 6, 1852) gave Palceacis 

 cyclostoma as the only species of its genus reported from the 

 Carboniferous, the other known species belonging to the 

 Silurian. Phillips (Geol. Yorks., IL, p. 202, pi. 11, fig. 9) 

 figures the species, and mentions Northumberland as the only 

 known locality in which it is found. 



There are two sets of specimens from Newton-on-the-Moor, 

 one mile south of High Whittle, in the British Museum 

 Catalogue, registered as B2700 and 50939*. 



BRACHIOPODS. 



Productus. 



The Giganteid Group. — In the Lower Bernician giganteid 

 Producti are exceedingly abundant, and display important 

 variation from the typical Productus giganteus of Martin. In 

 the Middle and Upper beds they are much scarcer, and in 

 place of the specialized forms which characterize the lower 

 horizon the huge Productus giganteus and smaller latissimoid 

 forms occur. The large species of Martin have very thick 

 shells, fine striae, and strong marginal folds. 



Productus a. — This, the predominating type of the Lower 

 Bernician giganteid group, differs from the typical form in 

 being smaller, more globose, and in having a more acute 

 beak. The striee are somewhat coarser, but the marginal 

 folds are inconspicuous. The ears are small, though distinct 



* Kindly communicated to me by Dr, Bather. 



