Figure 291.— Dorsal view of skull of 



Dicotylichthya punctulatus, 226 mm SL, 



Australia. 



pharyngobranchials 



epihyal 



branchiostegal rays 



basibranchials 

 hypobranchials 



ceratobranchials 



dorsal hypohyal 



ventral hypohyal 

 ceratohyal 



Figure 292.— Chi/omyctcnts achoepfi: 



dorsal view of branchial arches (extended oi 



lower side) and lateral view of hyoid arch, 



168 mm SL, Florida. 



Figure 293.— Nasal apparatuses of representative 



diodontids: A, Chilomycterus mauretanicus; 



B, C. orbicularis; C, C. schoepfi; D, C. antennatus, 



1 being the normal condition of two nostrils 



in each tube and a ridge along the inner 



surface, while 2 and 3 are variations of 



abnormal conditions, 2 having a single nostril 



on one side but the normal two nostrils on the 



other side (USNM 249592, 75.2 mm), and 3 having 



a single nostril on both sides (USNM 249592, 



85.7 mm); E, C. reticulatus; F. C. atinga. 



1 being the normal condition of an open nasal 



sac (one nostril) on each side and 2 being an 



abnormal condition of a closed sac with two 



nostrils on one side but an open sac on the 



other (ANSP 103900, 278 mm); G, Diodon hystrix; 



H. D. holocanthus, 1 being the normal condition 



of two nostrils in each nasal sac and 2 being 



an abnormal condition of a single nostril on 



one side but two nostrils on the other (ANSP 



105586, 186 mm); l.D.jaculiferus, 1 being 



the normal condition of two nostrils in 



each nasal sac and 2 being an abnormal 



condition of a single nostril on one side 



but two nostrils on the other (USNM 176952, 



42.2 mm): J, Dicotylichthys punctulatus; 

 K, D. nicthemerus, a bifid tentacle in adults 

 but two nostrils in a tube in young specimens. 



f IP '^7 ^"a 



