25 Echin. 
2Etiolocjy, Distribution. 
1023, 1027 
8. Parasites and Commensals. 
Gastropods parasitic on Ech. ; Vaney, 
331 : Crustacea on Ech. ; Whitelegg, 
351. 
Urceolaria synaptcc ; Cosinovici, 49 : 
gastropods in Hololh. ; Vaney, 332 : 
Anoplodium in Holothuria ; Wahl, 337. 
Chordeuma in Asteronyx ; Junger- 
sen, 113. 
Disease in Carboniferous Crin. ; 
Smith, 285. 
9. Protection of young. 
Marsupia of Antarctic Ech. ; Oster- 
gren, 203. 
10. Sexual dimorphism. 
Coloration of Echinus angulosus not 
affected by sox ; Thomson, 312. 
11. Relation to other animals. 
Ech., carried by crows and dropped 
in peat ; Twenhofel, 324. 
12. Geological aspect. 
Abundance of Crin. stems in pro- 
portion to crowns in Limestones partly 
illusory and partly duo to poriodio 
migration ; Bather, 10. 
Relations of types of deposit to con- 
dition of preservation of Crin. in 
Carboniferous Limestone ; Wright, 364. 
VARIATION AND AETIOLOGY. 
1023 
2. Variation in colour. 
Due to irregular physiological, pro- 
cesses or intensity of light ; Thomson, 
312. 
4. Variation, Meristic, Homoeotic. 
In position of apical system in 
Echinocardium cordatum ; Hawkins, 95. 
5. Variation, teratological. 
Abnormality in Echinus esculentus ; 
Hawkins, 98. 
Results of heterogeneous hybri- 
dization ; Moore, 171. 
6. Variation, bionomic. 
Peter, 216 & 217. 
Of Amphiopc , Clypcastcr, Farasa - 
Ic.nia, Scutclln ; Cottreau, 52 : of Ech. 
plutei ; Tennent, 307. 
Of Cretaceous Ast. ; Spencer, 290. 
Of Cyst. ; Bather, 11. 
7. Variation, mutational. 
Schleip, 268. 
8. Evolution. 
Jackson, 108 : Jordan & Kellogg, 
111 : Montgomery, 167 : Schleip, 268. 
Trend of Evolution in some Upper 
Cretaceous Irregular Ech. ; Hawkins, 
96. 
Of lunules in Amphiopc and Treto- 
discus ; Cottreau, 62. 
Principles of evolution in Cretaceous 
Ast. ; Spencer, 290. 
Of brachioles and stem of some 
Cyst. ; Bather, 11. 
10. Phylogeny. 
Williams, 353. 
Of Cambrian Iloloth. ; Clark, A. H., 
39. 
Of Lanicriinac ; Hawkins, 96. 
Of Cretaceous Ast. ; Spencer, 290. 
Of Oph. ; Matsumoto, 156. 
Relations of Psalidocrinus to Euge- 
niacrinidae ; Remes & Bather, 235. 
DISTRIBUTION. 1027 
A. Geographical. 
i. General. 
Ihering, 107 : Knauer, 117 : McIntosh, 
144 : Perrier, 214 : Roemer, 244. 
Deep Sea fauna ; Clark, A. H., 37. 
Of many genera of Ech. ; Cottreau, 52. 
Nodes in bathymetrical distribution 
of recent Crin. ; Clark, A. H., 35 : 
Crin. in British Museum ; Clark, A. H., 
40. 
11. Atlantic Ocean, etc. 
Plankton ; Ostenfeld & Wesenberg- 
Lund, 201. 
