CARBONIFEROUS BRACHIOPODA. 
287 
incurved. Fibres of shell-structure stout, slightly wavy; perforations well separated, 
subquincuncially arranged, and distinctly defined. 
Length and breadth about 3|-, depth 2 lines. 
Ods. — It is to Mr. Joha Young, of the Hunteiian Museum, College, Glasgow, that 
we are indebted for the first discovery of this new and very interesting species. He 
discovered it some years ago in the Upper Carboniferous Limestone of Bovver-Trapping, 
Dalry,^ Ayrshire ; and in sending me a specimen of the species Mr. Young writes, " The 
punctures can be seen with the hand-lens, still better under the microscope. It is 
probable that the shell-structure in this species is much the same as in Bhi/c. Geinit- 
ziana." On sending the specimen for Prof. King's opinion, he fully confirmed Mr. 
Young's discovery, and adds, " This species has a close resemblance to the Permian 
Camarophoria glohidina of Phillips. Mr, Young's specimen has its fibrous tissue, doubt- 
less through fossilisation, of a silvery lustre, in which respect it off'ers a strong contrast to 
the brown colour of the perforations. Where oblique sections of different layers of tissue 
are exposed, they show the perforations passing completely through the valves from the inner 
to the outer surface. The perforations are filled with the same brown substance as that 
forming the cast of the visceral cavity. Mhyncliopora Youngii cannot be confounded with 
Geinitziana ; the latter species has a greater number of sharply defined ribs, and they 
pass from the point of the umbo to the anterior margin of both valves." 
I have named this important species after my friend, John Young, its discoverer, and 
to whom Scottish palaeontology is much indebted for his many valuable researches. 
Genus Camakophoria, King. 
27. Camarophoria Kingii, Bav. Sup., PL XXXIII, figs. 12, 13. 
Shell subtrigonal, widest anteriorly, rounded in front, broader than long. Dorsal 
valve rather more convex than the ventral one, sometimes somewhat gibbous ; valve 
divided into three almost equal parts, of which the central one forms a moderately raised 
mesial fold ; surface covered with eleven or twelve wide, very moderately prominent ribs, 
gently longitudinally grooved along the middle, and of which some four form the mesial 
fold. Ventral valve not as deep as the opposite one, and divided by a wide mesial sinus 
1 On the 3rd of December, 18/8, Mr. John Young read to the Natural History Society of Glasgow 
a short notice of his discovery of this remarkable species, which he had collected some twelve 
years previously. He informs me likewise by letter that Mr. Robert Craig, of Langside, Beith, Ayrshire, 
has found the same species in the Hill Head Limestone. This is another locality for Rhynchojjora, 
and on a mucli lower geological horizon, Bower-Trapping being in the Upper, and Hill Head in the Lower 
Limestone Series of Ayrshire. 
