EE Te ES ee a ee ae | 
GEOLOGICAL DISTRIBUTION 9° 
TABLE II 
“a opengl OF FISHES IN GEOLOGICAL TIME 
ical distribution of the prominent groups of fishes as here shown is in the main 
as rod voy ittel (Palzontologie: Fische). The varying thickness of the lines denotes ap- 
proximately increase or diminution in the number of existing genera. 
; a itul ¢ 3 eB) 3 é oS) 
= l'aa! §| 2 2]. 3g sig| 3s 
gaia id iglal slé Sli 1 e 
Marsipobranchii. 
Cyclostomes . . 
PPteraspids . . . 
?Cephalaspids . . . 
Palzospondylus . . 
?Pterichthids 
Elasmobranchii. 
Cladoselache . . . 
Acanthodians. . . 
Pleuracanthids 
Cestracionts ° 
Recent sharks (in- 
cluding Notidanids) 
Rhinobatus 
te 
: 
| 
Soue 
i 
Siluroids é 
Gadoids and eiiet 
Teleosts . . 
