NOTES 
PAGE LINE 
1 6 23 Palechinoids. 
l6 26 Ophiuroids. 
1 6 30 Turrilepas Canadensis. 
1 6 31 Av'icula. 
1 6 32 Horse mussel (modiolopsis), Cockle (conocardhim), Scallop 
(aviculopecteri). 
1 6 33 Neolimulus, Hemaspis. 
\ 6 35 Lituites. 
1 6 45 Eurypterids (pterygotui). 
17 67 Pteraspis, Cephalaspis, and others. 
17 71 Holoptychius from Lower Silurian sandstone, Colorado. 
17 72 Polypterus birchir, an inhabitant of the Nile. 
17 74 Thelodus, Onchus. 
21 170 Sphenophyllum. 
21 172 Lycopods. 
21 174 Protannularia. 
22 179 Protocimex Siluricus from the lower Silurian, southern Sweden. 
It is the earliest known fossil insect. 
22 182 Palitoblattina. 
22 184 Palaopbonus nuncius. 
DEVONIAN PERIOD 
23 7 Bothriolepis, Coccosteus, Pterichthys. 
23 8 Homosteus. 
23 II Mesacantbus, Chirantant/MS, Glyptolaemus, Gyrotychius. 
23 12 Onycbodus sigmoides. 
23 1 6 Chirolepis. 
23 17 Dipnoi (dipterus, pbaneropleuron). 
24 26 Amphibians probably sprang from the Dipnoi. 
25 64 Spirifera mucronata. 
25 68 Gyroceras. 
26 77 Pterygotus Anglicus. 
26 78 Cupressocrinida. 
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