PLATE XXVII. 



CARBONIl-'KROUS SPECIES. 



Fig. 



1. Streptorhynchus crenistria, Phillips. Carboniferous limestone, Kildare, Ireland. 



2, 3, 4. „ ,, var. senilis, Phillips. Fig. 2. The original specimen, 



C. limestone, Bolland. British Museum. 



5. ,, ,, From Park Hill, Longnor, Derbyshire. Museum 



of Practical Geology. 



0, 7. ,, ,, A fragment of dorsal valve, showing the cardinal 



process and dental sockets. 



S. ,, ,, var. Kellii, 31' Coy. The original example, C. 



limestone, Monaghan, Ireland. 



9. „ ,, var. cylindrica, JJ'Coj/. The original specimen, from 



Arenaceous limestone of Castle Espie, Comber, 

 Ireland. 



10. ,, ,, var. quadrata, M'Coj/. The original specimen, Calp 



of Ballintrillick, Bundoran, Ireland. 8, 9, 10. 

 From SirR. Griffith's collection. 



