576 



J. W. KIEKBY ON MAEINE FOSSILS IK THE 



More than thirty feet of shale and sandstone intervene, in which 

 fossils have not been observed. 



Limestone No. 7 (3360 feet) is of irregular thickness; usually 

 about 15 inches. Its upper surface is covered with shells of 

 Myalina, some of which are large and more like M. crassa than the 

 common species (though less massive). Though these shells are 

 the prevailing fossils of the bed, one of the most characteristic species 

 is a large thick-shelled Bellerojohon, which comes very near to 

 B. costatus. Another species of frequent occurrence is Naticopsis 

 plicistria, little coteries of them often being found within the 

 apertures of the Bellerophons. Bhynchonella pleurodon is found 

 abundantly at one horizon of the bed. The last-named species, along 

 with Lingula mytiloides and L. squamiformis, are the only Brachio- 

 pods that have been met with so low in the Calciferous Sandstones. 



Myalina crassa ?, Flem. 



modiohformis, Brown. 



Nucula lineata, Phill. 

 Schizodus Salteri, Eth. 

 Rhynchonella pleurodon, PJiill. 

 Diastopora megastoma, M'Coy. 

 Stenopora tumida, Phill. 

 Beyrichia subarcuata, Jones. 

 Leper ditia Okeni, Munst. 



Orthoceras, sp. 

 Bellerophon costatus, 8ow. 



decussatus, Flem. 



Loxonema scalaroidea, Phill. 

 Macrocheilus acutus, Sow. 

 Murchisonia quadricarinata, M'Coy. 



striatula, Be Kon. 



Naticopsis plicistria, Phill. 

 Aviculopecten granosus, Phill. 

 Leda, sp. 



Within the next twenty feet of shale there are three thin bands of 

 Myalina modioliformis. The only other fossils found in these bands 

 are the scales of small Ganoids, Leperditia OJceni, var. scotoburdiga- 

 lensis, Spirorbis sp., and fragments of carbonized wood. A few 

 feet lower there is an irregular bed of arenaceous ironstone, full of 

 carbonaceous matter and the fragmentary remains of fishes, chiefly 

 of Bhizodus Hibberti. Then follow more shales and thin sandstones, 

 with Sphenopteris affinis, Lepidophyllum, seed-vessels? and other 

 plant-remains, Spirorbis sp., and Ganoid scales. 



No. 8 Limestone (3413 feet) is nineteen inches thick, hard, grey 

 in colour, and weathering red. Its characteristic fossils are Ostracoda, 

 13 species of which have been found in it. The other fossils are 

 most of them small, as though dwarfed : — 



Orthoceras, sp. 



Littorina scotoburdigalensis, Eth. 

 Macrocheilus striatulus, sp. nov. 

 Murchisonia quadricarinata, M'Coy. 

 Avicula recta?, M'Coy, 

 Myalina modioliformis, Brown. 

 Schizodus Salteri, Eth. 

 Beyrichia subarcuata, Jones. 



, var. 



Bairdia plebeia, Eeuss. 



Hisingeri, Miinst. 



siliquoides, Jones cf Kirkby. 



prsecisa, J. <Sf K. 



100 feet of measures intervene, chiefly sandstones. In the more 

 argillaceous beds are found SpTienopteris affinis, Lepidodendron sp., 



Bairdia subcylindrica ?, Munst. 

 Oythere Jonesiana, Kirkhy. 



intermedia, Miinst. 



sequalis, e/. ^" K. 



cypridiformis, /. Sf K. 



Kirkbya plicata, J. ^ K. 



spiralis, J. ^ K, 



Leperditia Okeni. 



— , var. extuberata, J. ^ K. 



Arcbgeoeidaris, small spine of. 



Spirorbis, sp. 



Teeth and scales of Ganoid fishes. 



