INDEX 



297 



Selachii, in classification, 8. 

 Semionotus, 157; S. kapffi, 157 (Fig. 



161). 

 Semon, R., 125, 181, 199, 200, 219. 

 Sense organs, characters of, 46-56; 



tables of, 276-277; integument and 



integumentary sense organs, tables 



of, 278, 279. 

 Sense of feeling, 46-48. 

 Sensory canals in head of Chimaera, 



30. 

 Sensory tubules, v. Lateral line. 

 Serrajizis, eggs of, 181 (Fig. 196), 186; 



development of egg of S. atrarius, 



208 (Figs. 269-283). 

 Shad, V. Alosa. 

 ■Shagreen denticle of shark, 23-25 



(Figs. 20-22) ; of sting-ray, 24 (Fig. 



23), 25. 

 .Sharks, movement of, 2; in classifi- 

 cation, 7, 8; antiquity of, 9, 10, 72; 

 gills of, 17 (Fig. 11), 19; spiracle 

 of, 19; gill shields of, 20; skin, 

 enamel, and dermal denticle of, 23- 

 26 (Figs. 20-22) ; shagreen denticle 

 of the Greenland shark (^Lcemargus), 

 24 (Fig. 21); jaw of Port Jackson 

 shark {Cestracio7t) , 24 (Fig. 27), 

 27; evolution of the dermal armour- 

 ing, 25, 26 (Figs. 25, 26) ; unpaired 

 fins of, 33, 34 (Figs. 39-43) ; caudal 

 fin of, 36-39 (Figs. 45-47) ; lateral 

 line of, 49, 50 (Figs. 61, 62), 51, 76; 

 description of, 72-98 (Figs. 83-103) ; 

 position of, 72; general anatomy of, 

 73 (Fig. 83); skeleton of, 74-76 

 (Fig. 84) ; sub-notochordal rod in 

 skeleton, 76 (Fig. 85); integument 

 of, 76; brain of, 76; nasal organ, 

 eye, and ear, 76; renal and repro- 

 ductive system of, 76; digestive 

 tube, viscera, 77; heart, 77; clasp- 

 ers, 77; fossil sharks described, 77- 

 86 (Figs. 86-91) ; teeth of fossil, 86; 

 recent sharks, 87-95 (Figs. 92-101); 

 affinities of, 95-98 (Fig. 103) ; eggs 

 and breeding habits, 181 (Figs. 189- 

 190), 183, 184; fertilization of eggs, 



187 note; development of egg of, 

 194-198 (Figs. 216-230); larval de- 

 velopment of, 215-218 (Figs. 284- 

 289); list of authors and their works 

 on sharks, 238-244; comparison 

 tables of the skeleton of, 252; skel- 

 eton of Cestracion galeatus, 75 (Fig. 

 84), 255; skull, jaws, and branchial 

 arches, tables, 256; heart, tables, 

 258 (Fig. 317), 260; gills, spiracle, 

 gill rakers, and opercula, tables, 262 

 (Fig. II, p. 259); swim-bladder, 

 tables, 264; genital system, tables, 

 266; urinogenital ducts and exter- 

 nal openings, 267 (Fig. 333), and 

 tables, 270; plan of circulation in, 

 tables, 268 (Fig. 338), 269; ab- 

 dominal pores, tables, 271 ; brain of, 

 272 (Fig. 341); sense organs of, 

 tables, 276; integument and integ- 

 umentary sense organs, tables, 279; 

 comparison tables of the early devel- 

 opment of, 280, 281. 



Siluroid, antiquity of, 9; affinity and 

 phylogeny of, 147, 166 (171 A), 

 171 ; South American Siluroid (^Cal- 

 lichthys armatiis), 172 (Fig. 178); 

 eggs and breeding habits of, 181 

 (Fig. 195), 185, 186 and note; 

 heart, conus and bulbus arteriosus, 

 tables of, 258 (Fig. 318). 



Siphostoma, eggs and breeding habits 

 of, 186. 



SiRENOiDEi, in classification, 8. 



Skates, description of, 93-95 (Figs. 

 100-102) V. Ray. 



Skeleton, V. Shark, Pleur acanthus, Chi- 

 m^roid, Dipnoan, Ceratodus, etc. 



Skin defences, v. Dermal and Teeth. 



Skull of fishes, dermal bones of head 

 root of Pleur acanthus, 84 (Fig. 90 

 A'); of Chimeeroids, 1 13; resem- 

 blances of skull of lung-fishes to 

 Elasmobranchs, 128; of Dinichthys 

 intennedius, 133 (Fig. 1 33 and Fron- 

 tispiece) ; table of relations of skull, 

 jaws, and branchial arches of, 254 

 (Figs. 310-315)' 256. 



