290 



INDEX 



DIPNOANS, 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^); 

 relationships, 127-129; amphibian 

 characters of, 127, 129; kinship to 

 sharks, 127; the advancing struc- 

 tures of, 1 29 ; 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. 



Early development, v. Development. 



Edestus heinrichsii, fin spine of, 28-30 

 (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 vulgar is, 171, 173 (Fig. 

 1 80). 



Eggs of fishes, 180-186 (Figs. 186- 

 199)1 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, 1 28, 

 129; to Athrodirans, 136, v. Shark; 

 eggs and breeding habits of, 183, 

 184 (Figs. 189,189^); 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). 



Entering angle of fishes, 5, 6. 



Environment, changes due to, 167- 

 169 (Figs. 172-174). 



Erythrinus, swim-bladder of, 22 (Fig. 



15)- 

 Eurynotus, 157; E. crenatus, 156 



(Fig. 159). 

 Eusthenopteron.) 151153; E. foordi, 



152 (Fig. 154). 

 Evolution, of fishes, slowness of, 1 1 ; 



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, 271 



(Figs. 332-337, P- 267). 

 Exoskeletal specializations of Dip- 



noans, 129. 



