Fishes of the Famil/j Tcosteldce. 



Gil 



without duct. Skeleton weakly ossified, largely cartilaginous, 

 soft, and flexible. 



Fig-. 1. 



^/et/i 



A. B. 



Skull of Icosteus, from aI)ove (A) and from below (B), 



/, frontal ; 2h parietal ; 7neth, mesetlimoid ; letJi, lateral ethmoid ; soc 

 supraoccipital ; boc, basioccipital ; eoc, exoccipital ; epo, epiotic • 

 pto, pterotic; spo, sphenotic ; pro, prootic^ as, alisphenoid • 

 2)s, parasplienoid ; v, vomer. 



Fio-. 2. 



.'^/^ 



Con 



^y 



A. P. 



Icosteus enigmaticus. Skeleton of pectoral (A) and caudal (B) fins. 



sc, hypercoracoid (scapula) ; cor, hypocoracoid ; r, radials ; 

 ep, epurals ; hy, hypurals. 



I have studied the skeleton of an example of Icosteus 

 enigmaticus^ but the skull has been pushed out of shape. 



