BRITISH ASTEROIDEA AND OPHIUROIDEA. 
197 
Horizons of Jurassic species of Ophiuroidea : 
Horizons of Palaeozoic Asteroidea : 
from Middle Lias 
Lower Lias 
Carboniferous 
Devonian 
Silurian 
Range of British fossil Echinoidea, Asteroidea, and Ophuiroidea, 
Purbeck beds .... 
( Archaster 
Arthraster 
Asterias 
Astrogonium 
Astropecten . ; 
Clenodiscus . 
Echinaster 
Echinus 
Luidia 
Ophidiaster . 
Ophiolepis 
Oreaster 
Pteraster 
Scylaster 
Stellaster 
Solaster 
< Uraster 
from the 
Structure of 
PAGE 
140, 143, 146, 147, L48, 151, 153 
. 150 
23, 26 
. 36 
23—36, 169 
Upper Trias to the 
. 189 
. 18 
9 
10—12 
7, 8, 13, 18 
4, 13, 17, 18, 22 
. 18 
11, 13, 17, 18 
18, 19 
6, 17, 18 
. 8, 13, 17, 18 
. 11 
9, 18, 22 
5, 17 
13, 18 
5, 17, 18 
4, 11, 17, 18, 22 
Summary and analysis of the British Jurassic Echinoidea, Asteroidea, and Ophiuroidea 
described in Vols. I and 11 of the ' Oolitic Echinodermata ' . . . 171 — 187 
Terminology of the Asteroidea : 
Ambulacral and interarabulacral plates ..... 13 — 16 
Arms 
Body 
Dermis . 
Eyes 
Granules . 
Madreporiform body 
Oral opening 
Osseous system 
Ovaries . 
Paxillse . 
Pedicellarise 
Skeleton . 
Spines 
Tegumentary appendages 
Test 
Vent 
1—10, 12, 131, 134, 135, 137 
1, 3—22, 131, 134, 135 
1—11 
7, 16 
18 
5, 16, 17, 22,32 
. 132 
10—16 
. 131 
4, 6, 11, 18 
4, 5, 9, 11, 18—21 
], 2, 3, 10 
17, 18, 20 
17—21 
3 
4, 5, 9, 13, 16, 17, 21,22 
