ILLUSTRATIONS. 



-H--34- 



PAGS 



FINS OF PERCH . . . . . . .19 



LATERAL LINE ....... 20 



BRANCHED RAY ....... 21 



SCALE OF THORNBACK . . . . . .21 



UPPER JAW OF MALE THORNBACK . . . .21 



CTENOID SCALE . .' . . . . .22 



CYCLOID SCALES ....... 22 



CARDIFORM TEETH ...... 25 



HOMOCERCAL TAIL ...... 25 



HETEROCERCAL TAIL ...... 25 



SHIELD OF STURGEON ...... 26 



TEETH OF ANGLER .... .29 



HINGED TOOTH OF ANGLER . . . . 30 



HEAD OF BARBEL ...... 31 



THORACIC VENTRALS ...... 32 



ABDOMINAL VENTRALS ...... 33 



TEETH OF HAKE ...... 34 



TEETH OF CAT-FISH . -35 



TEETH OF BALLAN WRASSE . . < . -37 



UPPER JAW OF PIKE ... -3^ 



DENTARY OF PIKE ... 39 



LOWER PHARYNGEAL TEETH OF CARP . 39 



SKULL OF PERCH ...... 42 



PREMAXILLARY, MAXILLARY, AND DENTARY OF SALMON . 43 

 GILL ARCHES ... .43 



OTOLITH OF CODFISH ...... 44 



