INDEX 
Paddle-fish, v. Polyodon. 
Palaaspis americana, 67 (Fig. 75); 
paired fins or spines, 71 note. 
Paledaphus, median foramen, 55. 
Pal@oniscus, in classification, 157, 158 
(Fig. 164); Palozic, 166 (Fig. 
171 A). 
Palaospondylus, in classification, 8; 
antiquity of, 9, 71; P. gunni, 65 
(Fig. 73), 70; palzichthyic affini- 
ties, 70; list of authors and their 
works on Palaospondylus, 238. 
Pander, 121, 151. 
Paraliparis bathybius, 168 (Fig. 172). 
Parexus, pectoral fin of, 42 (Fig. 51), 
. 44 
Parker, W. N., 7, 117, 127, 128. 
—, T. J., 41, 58. 
Parsons, 5, 6. 
Perca, v. Perch. 
Perch, antiquity of, 9; scales of, 25 
(Fig. 31 A), 26, 171; described, 
174; Perca americana (= flyvia- 
talis ?), 173 (Fig. 181); digestive 
tract, tables of, 262 (Figs. 326-331). 
Petalodonts, 86. 
Petromyzon, 61; P. marinus, 60 (Fig. 
72), 61 (Fig. D), 62; skeleton of, 
58 (Fig. 69); eggs of, 180-183; 
eggs of P. marinus, 181 (Fig. 
188); fertilization of eggs, 187; 
development of, 188-192; develop- 
ment of P. planeri, 189 (Figs. 200- 
214); digestive tract, tables of, 262 
(Fig. 326); genital system, tables 
of, 266; urinogenital ducts and ex- 
ternal openings, 267 (Fig. 332); 
excretory system and urinogenital 
ducts, 270; brain of, 272 (Fig. 
340); central nervous system, 274. 
Phaneropleuron, in classification, 8; 
description of, 122 (Fig. 126). 
Phocena lineata, v. Porpoise. 
Phylogeny, tables of, 98 (Fig. 103), 
166 (Fig. 171 A); comparison of 
the phylogenetic tables of the differ- 
ent authors, 282, 283. 
Phyllopteryx, 178. 
295 
PHYSOSTOME, 166 (171 A). 
Pineal eye, 53-56. 
Pipe-fish, v. Syngnathus. 
Pisces, v. Fishes. 
PLECTOGNATHI, 176. 
Pleuracanthus, in classification, 8; 
gill slits, 16; a fossil shark, 78; 
anatomy and skeleton of, 83 (Fig. 
go); dermal bones of head roof, 
84 (Fig. 90 A); teeth of, 84 (Fig. 
go £); affinities of, 95, 98 (Fig. 
103); anterior spine of dorsal fin, 
114; tail of, 115; Coccosteus com- 
pared with, 131. 
PLEUROPTERYGII, in classification, 8. 
Pogonias, v. Drum-fish. 
Pollard, H. B., 64, 113, 132. 
Polyodon, barbels of, 46, 47 (Fig. 59), 
48; described, 160-163; P. spatula, 
162 (Fig. 166 8); gills, spiracle, 
gill rakers, and opercula, tables of, 
261. 
Polypterus, swim-bladder of, 21, 22 
(Fig. 17); origin of derm cusps, 30; 
caudal fin of, 36, 37 (Fig. 47); tail 
of, 115; skeleton of P. dichir, 144, 
147 (Fig. 147); contrasted with 
Teleosts, 144; P. dichir described, 
148 (Fig. 148), 149 note; P. lap- . 
radet, 149 (Fig. 149); in table of 
phylogeny, 166 (Fig. 171 4); skull 
and branchial arches, 254 (Fig. 
314); table of relations of skull and 
branchial arches, 257; comparison 
tables of gills, spiracle, gill rakers, 
and opercula, 261; digestive tract, 
tables, 263; swim-bladder, tables, 
264, 265 (Fig.17); excretory system 
and urinogenital ducts, tables, 270. 
Porcupine-fish, v. Chilomycterus. 
Porpoise, striped, lines of, 5 (Fig. 5). 
Port Jackson shark, v. Cestracion. 
Powrie, 82. 
Prionotus, barbels of, 46, 47 (Fig. 60), 
48. 
Pristiophorus, antiquity of, 9; descrip- 
tion of, 92 (Fig. 99); affinities of, 
96-98 (Fig. 103). 
