290 INDEX 
Drpnoans, in classification, 7, 8; an- 
tiquity of, 9, 10, 147; swim-bladder 
of, 21; affinities to shark, 96, 98 
(Fig. 103); general description of, 
116-129 (Figs. 121-129); structural 
characters and general anatomy of, 
116-120 (Fig. 121); skeleton of, 
118 (Fig. 122), 119; fossil forms, 
120-124 (Figs. 123-126); living 
forms, 123-127 (Figs. 127-129 4); 
relationships, 127-129; amphibian 
characters of, 127, 129; kinship to 
sharks, 127; the advancing struc- 
tures of, 129; the Arthrodiran lung- 
fishes, 129-138 (Figs. 130-144); 
arthrodiran affinities, 136; eggs and 
breeding habits, 181 (Fig. 192), 
185; larval development of, 218- 
221 (Figs. 290-295); names of 
authors and works on, list of, 244- 
246; comparison tables of skeleton, 
253; skeleton of Protopterus annec- 
tans, 119 (Fig. 122); skull and 
branchial arches, table of relations 
of, 257; heart, conus and bulbus 
arteriosus, tables of, 258 (Figs. 320, 
321); comparison tables of heart, etc., 
260; digestive tract, 262 (Fig. 329) ; 
comparison tables of digestive tract, 
263; genital system, tables, 266; 
urinogenital ducts and _ external 
openings, tables, 267 (Figs. 332- 
337); circulation in, tables, 269; 
brain, 272 (Fig. 343); central ner- 
vous system, tables, 275; sense or- 
gans, tables, 277; integument and 
integumentary sense organs, tables, 
279; early development of, compari- 
son tables, 280-281. 
Dipterus, in classification, 8; antiquity 
of, 9; description of, 121 (Figs. 
123-125), 122. 
Dohrn, A., 40, 63. 
Dolphin, fish-like form of, 6. 
Dorsal fin, v. Fins. 
Drum-fish, barbels of, 46, 47 (Fig. 
56). 
Dugong, fish-like form of, 6. 
Eagle-ray (Myliobatis), dental plates — 
of, 24 (Fig. 30), 27. : os 
Early development, v. Development. eo 
Edestus heinrichsti, fin spine of, 28-300 
(Figs. 35-38). 
Edinburgh Society, Transactions of, — 
quoted, 70. 
Edwards, V. N., 184. 
Eel, movement of, 2 (Fig. 2); gills of, 
18; median fins of, 31; description 
of Anguilla vulgaris, 171, 173 (Fig. 
180). 
Eggs of fishes, 180-186 (Figs. 186- 
199), v. Comparison tables of the 
early development of fishes, 280, 
ELASMOBRANCHII, in classification, 8, 
9; antiquity of, 9; description of, — 
72-97 (Figs. 83-102); affinities of, 
95; resemblances to lung-fishes, 128, 
129; to Athrodirans, 136, v. Shark; 
eggs and breeding habits of, 183, 
184 (Figs. 189, 189 4); circulation 
in, 268 (Fig. 338), 269; central ner- 
vous system, tables of, 274, 275. _ 
Elonichthys, 156; E. (Rhabdolepis) 
macropterus, 156 (Fig. 158). 
Embiotocids, eggs of, 185. 
Emery, C., 169, 170. 
Enamel of shark skin, 23, 24 (Fig. 
20); enamel organ of shark, 23, 24 
(Fig. 20). . a 
Entering angle of fishes, 5, 6. a 
Environment, changes due to, 167 ; 
169 (Figs. 172-174). 
Erythrinus, swim-bladder of, 22 (Fig. 
15). 
Eurynotus, 157; £. crenatus, 156 
(Fig. 159). 
Eusthenopteron, 151-153; £. igs 
152 (Fig. 154). 
Evolution, of fishes, slowness of, ert) by 
of fins, 30-46; of unpaired fins, 31- 
39 (Figs. 39-43); of paired fins, 39- . 
46 (Figs. 49-54). = 
Excretory system, tables of, 270, 7 
(Figs. 332-337, p- 267). 
Exoskeletal specializations of Dip- 
noans, 129. 
