Figure 47 Silurian fossils. (VMMMMHM; A; graptolites, B, C; corals, 

 D-I ; cystoid, /; crinoids, K, L; bryozoans, M-Q). A Arthrophycus alle- 

 ghanicnsis (= harlani, x'/i. B Monograptus clintonensis, x l / 2 . C Enlarge- 

 ment of same, x5. D Syringopora retiformis, x^i. E Halysites catenulatus 

 (= catenularia) , x l / 2 . F Favosites niagarensis, x z / 2 . G, H Streptelasma 

 (Enterolasma) caliculum, x$i. I Palaeocyclns rotuloides, xl. / Caryocrinus 

 ornatus, x}i. K Eucalyptocrinus crassus, x s / 2 . L Ichthyocrinus laevis, xM- 

 M Fenestclla elegans, x l / 2 . N, Callopora elegantula, xf4, with enlarge- 

 ment. P, Q Lichenalia concentrica, x l / 2 , with enlargement of surface. 



