DISTRIBUTION. 



189 



Pinna mutica, M'Coy. 

 *Modiola lata, Portlock. 



* ,, Macadamii, Portlock. 

 „ ligonula, de Kon. 



*Lithodomu8 carbonarius, Hind. 

 *Naiadites crassa, Flem., sp. 



* „ obesa, R. Etli., jun., sp. 

 Myalina Flemingi, M'Coy, sp. 



* ,, pcrnoidcs, Portl., sp. 



* ,, rcdcsdalcnsis, Hind. 



,, sublamellosa , R. Elli., jun 

 Verneuillii, M'Coy. 

 Parallelodon Geinitzi, de Kon. 



semicostatus, M'Coy, sp. 

 Niwii/iiiiii altcuitala, Flem., sp. 

 ,, brevirostris, Phill., sp. 

 ,, laBvistriata, M. and W. 

 ,, Sharmani, P. Etli., jun. 



stilla, M'Coy. 

 Nucula gibbosa, Flem. 

 „ oblonga, M'Coy. 

 „ scotica, Hind. 

 Ctenodonta Isevirostris, Portl., sp. 

 *Schizodu8 pentlandicus, Rhind., sp. 

 l'nihisc/ii::(j:liis axiniformis, Portl., sp. 



* ,, nuctdoides, M'Coy, sp. 



obliquus, M'Coy, sp. 

 rectangularis, M'Coy, sp. 

 *Carbonir<>!tt autigna, Hind. 



* „ elcgaus, Kirkby, sp. 

 *Anthracomya Isevis var. scotica, R. Etli. 



* Anthracomya valenciensis, Hind. 



* „ subparallela, Portl., sp. 

 Edmondia Josepha, de Kon. 



laminata, Phill., sp. 

 ,, Lycllii, Hind. 



„ Maccoyi, Hind. 



,, 'pentonensis, Hind. 



* „ subplicata, Kirkby. 

 „ sulcata, Flem., sp. 

 ,, transversa, Hind. 



* ,, truncata, Hind. 

 Cardiomorpha oblonga, Sow., sp. 

 Sedgwic/ria gigantea. M'Coy. 



,, ovata, M'Coy. 



„ suborbicularis, Hind. 



Mytilomorpka rhombea, Phill, sp. 

 Cypricardt'lla paraUela, Phill., sp. 



,, rectangularis, M'Coy, sp. 



Saugninolitcs (dull' iic ii sis, Kirkby. 

 ,, angustatus, Phill-, sp. 



,, clavatus, M'Coy, sp. 



plicatus, Portl., sp. 



* ,, roxburgensis, Hind. 



striiitolamellosus, de Kon. 

 ,, striatus, Hind. 



,, tricostatus, Portl., sp. 



,, variabilis, M'Coy, sp. 



Allorisma sulcata, Flem., sp. 

 Soleuomya excisa, de Kon. 



„ primxva, Phill., sp. 



Of these only 21 species are, as far as is known 

 Sandstone beds. 



confined to the Calciferous 



It will be noted that out of 340 species of Lamellibranchs described in this 

 monograph 212 species do not pass above the top of the Carboniferous Limestone, 

 and its equivalent, the upper beds of the Yoredale Series in Wensleydale and the 

 Upper Limestone Series of Scotland. Of the 98 species which occur in the 

 Pendleside Series and Upper Carboniferous Series, comprising the Millstone (Int.-* 

 and the Coal Measures, 67 species are peculiar to those beds, and do not pass 

 downwards, while only 31 species pass up from below. There is a great fauna! 

 break, therefore, at the horizon of the top of the Carboniferous Limestone Series. 

 Although I have not worked out the exact figures, the same state of things obtains 

 in the case of the Gasteropoda and Cephalopoda, while the study of the Corals and 



20 



