Figure 48 Silurian fossils. (Brachiopods, A-L; pelecypods, M-P; gastro- 

 pods, Q-X). _A\,2 Whitfieldella sulcata, xY 4 . B Lingula cuneata, xl. 

 C Spirifer niagarensis. D, E Monomcrella novcboracum ; internal view of 

 valve and side view of exterior, xY 4 . F Schuchcrtella interstriata, x l /i. 

 G Spirifer vanuxemi, x\y 2 . H Orthis flabcllitcs, x$i- I Rhynchotreta 

 cuneata var. amcricana, xj4. J Pcntamerus oblongus, x x /i. K Leptaena 

 rhomboidalis, xYi (Niagaran type). L Atrypa nodosiriata, xY 4 . M Pterinea 

 emacerata, xty. N Liopteria ( ?) subplana, xYa- Orthodestna curtum, 

 x^4. P Modiolopsis pnmigenia, xl. Q 1, 2 Bucanella trilobata, xl. R 

 Euotnphalus fairchildi, x z A. S Platyccras niagarense, x l /t. T Holopea 

 pervetusta, x}4. U, V Tremanotus alpheus (Trematanotus C & R), x x / 2 . 

 W Diaphorostoma niagarense, xY*. X Coelidium macrospira, xYi. 



