V.)2 APPEXDIX 



CHORDATA 



Animals which possess, at some time of hfe, throat slits and a 

 dorsal supporting rod or chorda.. 



[HEAIICHORDA] 



Animals of worm-like form, showing gill-slits like fishes. Balano- 

 glossus (293). 



[TUNICATA] 

 Usually sessile Chordata, often forming colonies (290). 



[VERTEBRATA-ACRAXIA] 



Free-li^'ing fish-like Chordata, but "s^-ithout skull, paired fins, or 

 heart, and wdtli colorless blood. Amphioxus (294j. 



[VERTEBRATA-CRAXIATA] 



Free-living Chordata, with skull and complex brain, and red 

 blood. 



CYCLOSTO^NII. Eel-like vertebrates without lower jaw, and 

 li\'ing a parasitic life (322). 



PISCES. Aquatic vertebrates with gills, without lungs, and 

 with paired fins instead of legs. SEL.-iCHn, skeleton cartilaginous, no 

 operculum, spiral valve (322). Ganoidei, skeleton either cartilagi- 

 nous or bony, spiral vah e and operculum present : sturgeons (323) ; 

 spoon-bill (324) ; garpiike (324) ; bowfin (324). Teleostei, skele- 

 ton bony, no spiral valve. [Acanthopteri], dorsal, anal, and ven- 

 tral fins with spines, pharyngeal bones distinct : perches (312) ; 

 darters (311); sunfishes (313); toadfishes (313); sculpins (313); 

 silversides (314); sticklebacks (315). [Pharyngogn.i.thi], fins with 

 spines, pharyngeal bones united. [Axacaxthixi], fins without 

 spines, ventral fins far forward : codfishes (310) ; flatfishes (316). 

 [Phtsostomi], fins without spines, ventral fln placed far backward : 

 smelts (309); trouts (310); whitefishes (316); catfishes (317); 

 suckers (317) ; minnowF (318) ; pikes (319) ; shads (319) ; eels 



