SKELETON OF FISHES 



253 



-rt 



il 



. >-J3 C o 



9.c $3 2 



IS^II^SJ 



*r* ^ C3 r> ^ "* *"-^ "-^ *^ 



15 e &c 



Chondr 

 and is conflu 

 massive in A 



in other form 

 ossification pr 

 mouth surface 

 brane) bones. 



niu 

 es ; 

 rmal 

 ener 

 nal 

 iety 



Chondrocr 

 cartilage bo 

 column. D 

 reduced in g 

 often additio 

 in great var 

 tegals) . 



liiiifi 



c^t-p^rj^rt 



ne 

 der 

 io-b 

 pec 



tor 

 fin 

 to 



o) " . <" ^2 in 



fcJ3 "OTd O 



i'SW-f- 



-1 _- rt C U.5 jg w 



Biis-clill 



t-urti; 1 - 5 ^ rt 



. ,s = 2 a 



ns 

 ycer 

 y de 

 rma 



Unpaired fi 

 Caudal diphy 

 Dorsal mainly 

 supports. Der 

 ized joint in a 

 fins shark-like 

 clustering roun 

 (basals). " Cl 

 tral fins of the 



diphy- 

 al and 

 archip- 

 of all fins 

 ifurcating 



l por- 

 ments 

 fins in 

 n) ; in 

 ls con- 



o 

 adi 

 " 



Unpaired fins continuous 

 cercal tail; their supports 

 basal cartilages. Paired fi 

 terygial." The outer halve 

 consisting of jointed and 

 dermal rays. 



Unpaired fins shark-li 

 tions, however, enlarged 

 segmented and forked. 

 some forms shark-like (P 

 others, largely dermal, radi 

 stricted, fused, insignifican 



External portion of unpaired fins sup- 

 ported by dermal rays of many types, 

 supporting parts representing mainly 

 radio-basals of older fin types ossified, 

 often with fusions. External portion of 

 paired fins dermal; radio-basals greatly 

 reduced, confluent, ossified. Tail homo- 

 cereal. 



5S 



^^U 



r-~ ' D. (U O 



I 



l-ilSMI 



iss-^g-i 



2 c J cs o,S 



1-g c ^l| 

 Il^llfi 



^ggg 



ilitlii 



^2 ^2 O U^ <U 





2 ] 



w c ~ 

 got 



