EXPLANATION OF PLATE VI. 
1. 
2 . 
3a. 
4 - 
5 - 
6 . 
7 - 
8 . 
9 - 
io. 
na. 
12 . 
13 - 
14. 
15. 
16. 
170. 
18. 
19. 
20 . 
21 . 
22 . 
23 - 
24 a. 
25 - 
26. 
27. 
28. 
29. 
3 °* 
Monograplus Galaensis, Lapw. 
„ M‘Coyi, Lapw. 
lobiferfus ? M‘Coy. Var. pandus (proximal extremity) 
3 b, distal extremity ; 30, the same enlarged. 
Ceph alog rap tics cometa , Geinitz. 
Dimorphogrciptus Swans toni , Lapw. 
„ elongatus, Lapw. 
Diplograptus acuminatus , Nich. 
,, confertus , Nich. 
„ sinuatus, Nich. 
„ tricornis, Garr. 
„ angustifolius, Hall. il£, portion enlarged. 
„ tamariscus , Nich. 
}J dentatus , Brogn. 
,, Hughesii , Nich. 
,, insectiformis , Nich. 
„ folium , His. 
„ truncatus, Lapw. 1 7 ^ portion enlarged. 
,, foliaceus , Murch. 
,, vesiculosus, Nich. 
,, quadtimucronatus , Hall. 
„ Whitfieldi , Hall. 
„ mucronatus , Hall. 
„ bimucronatus, Nich. 
Glossograptus Hincksi, Hopk. (Ventral aspect); 24^ lateral aspect. 
Lasiograptus tnargaritalus, Lapw. x. 2. 
,, Harknessi , Nich. x. 2. 
Clathrograptus cuneiformis , Lapw. x. 2. 
Retiolites fibratus , Lapw. x. 2. 
„ perlatus ? Nich. Var, obesus, Lapw. x. 2. 
u Var. Daironi, Lapw. 
x. 2. 
