INDEX 



611 



Discinopsis, 244. 



Disculina, 245. 



dissoconch growth in Avicula, 23. 



distortions, pathologic, Hyatt, 40. 



divergence, reproductive, Vernon, 37. 



Dolichometopus, 146. 



Dorycrinus unicornis, spines on terminal 



sacs of, 45. 

 Dorypyge, 142. 

 Dybowsky, B. N., specific development 



of Gammarus in Lake Baikal, 65. 

 Dynastes hercules, horns in, 59. 

 Dynastidse, protective horns in males 



of, Wallace, 60. 

 Dyscolia, 278, 307. 



absence of septum, hinge-plate, and 

 dental plates in, 278. 



adult arm structure in, 291. 



discoid lophophore in, Fischer and 

 CEhlert, 278. 



loop in, 282. 



trocholophus stage in, 278. 

 Dyscoliidae, 307. 

 Dyscoliinse, 291. 



defined, 307. 

 Dysplanus, 146. 



eyes in, 147. 



position of eyes in, 147. 



E 



Eatonia, 245. 

 Eccoptocheile, 129, 155. 



pentamerous lobation of glabella in, 



155. 

 Echidna, extreme spinosity in, 70. 



male, spur on hind limbs of, 9, 59. 

 modified hairs of, 9. 

 protection of, by spines, 54. 

 Echidnoceras, 70. 



setimanus, spiny character of, 55. 

 Echinaster spinosus, protective spines in, 



56. 

 Echinocaris socialis, three spines in, 84, 



85. 

 Echinodermata, 25, 230. 



a typically spiniferous sub-king- 

 dom, 68. 



generally movable processes of, 9. 

 homologous structures in, 94. 

 localized stages of growth in, Jack- 

 son, 16. 



movable spines of, 94. 



primitive type of structure in, 26. 



repetition of structures in, 68. 

 Echinoidea, compound spines in, 68. 



minute spines in early genera of, 25. 



spine growth in, 69. 



spine production in, 13. 

 echinoids, protechinns in, 1 22. 

 Echinops, foliage of, transformed into 



spines, 74. 

 EctillcBnus, 146. 



position of eyes in, 147. 

 Edestus vorax, spines of, 68. 

 Edwards and Haime, spinules in septal 

 f? lines of Tetracoralla, 50. 

 effects, summary of the operation of the 



law of multiplication of, 6. 

 eggs, possible trilobite, 169. 

 Eichwaldia, casts of pedicle of, David- 

 son, Walcott, 257. 



diagnosis of, Billings, 336. 



reticulata, 335. 

 elk, antlers of, 9. 



simple antlers of young, 24. 



spine production in, 13. 

 Elkania, 243. 



Ellipsocephalus, 142, 143, 145. 

 Elliptocephala, 142, 143, 144, 145. 



asaphoides, 144. 



interocular spines of young, 



136. 



pleura from the glabella in, 127. 

 pygidium in, 143. 

 retrally directed pleura of, 79. 

 Emmrich, H. F., classification of trilo- 



bites, 111, 112. 

 Encrinuridae, 129, 131, 152, 153. 



defined, 153. 

 Encrinurus, 113, 129, 153. 



eye-line in, 154. 



glabella in, 154. 



pygidium in, 223. 

 Endesia, 297. 



cardium, 297. 

 endopodites of Triarthrus, 224. 



of Trinucleus, 224. 

 Endymionia, 138, 220. 

 energy, bathmic, 34. 



entergogenic, effect of action of, 

 Hyatt, 29. 



of growth force, 31, 34, 38. 

 Enteletes, 245. 



