NOTES 
PAGE LINE 
12 30 The sea no doubt at this time possessed its seaweeds ; and 
Oldhamia may be referred to them. The geological 
evidence, however, of seaweeds is not clear until we reach 
the Silurian period. Geikie " Text Book of Geology " 
vol. ii. 910; Dana "Manual of Geology" 469; 
Nicholson and Lydekker " Manual of Palaeontology " 
vol. ii. 1482. 
12 31 Protospongia. 
12 33 Medusina, and others. 
12 35 Corals (Archaocyathus and others). Graptolites (Bryograptus). 
12 37 Protocystites. 
12 39 Trails and borings of sea-worms are found in the earliest 
Cambrian strata. 
12 42 Brachiopods. 
12 44 Llamellibranchs (Modioloides priscus). Gastropods (Playtcerai 
primtevum). 
12 46 Pterapods (Hyolithes). 
13 50 Phyllocarida (Hymenocaris vermlcauda). 
13 53 Ostracoids (Leperditia). 
13 63 Olenus truncatus, Conocorypbe Sultzeri, Olenellus Kjerulfi, 
and many others. 
1 3 67 Crinoids (Dendocrinus Cambriensis). 
13 69 Palteaster. 
13 72 Orthoceras and Cyrtoceras. 
14 75 Foraminifera. 
14 92 See Nicholson and Lydekker, p. 99 
SILURIAN PERIOD 
15 II Necrogammarus Saltveyi. 
15 1 8 Corals with structural arrangement presenting a wrinkled 
(rugosus) appearance are termed " rugose." " Tabu- 
late " corals possess highly developed transverse parti- 
tions or tabula. 
224 
