406 Analytical Synopsis of the Order of Squali. 



Genus Somniosus Lesueur, 1818. 

 Lsemargus Milller and Henle, 1838. 

 Leiodon Wood, 1846. 



Type Somniosus brevipinna Zes. 



Family ECHINORHINOID^ Gill. 



Genus Echinoriiinus Blainville, 1816. 

 Goniodus Agassiz. 



Type Echinorhinus spinosus Blainville. 



Family PPJSTOPHOROID^ Bleeher. 

 Genus Pristiophorus Midler and Henle^ 1838. 

 Pristidophorus Bon, 1838. ' 



Type Pristiophorus cirratus Milller and Henle. 



Family GmGLYMOSTOMATOID^ Gill. 

 Genus Ginglymostoma Miiller and Henle^ 1838. 

 Nebrius Ruppell. 



Type Ginglymostoma concolor. 



Family SCYLLIORHINOID^ Gill. 

 Synopsis. 

 Caudal fin moderately elongated. 



Branchial apertures nearly equidistant. 



Spiracles close behind eyes. Anal fin under or 

 before the second dorsal. ScylliorhiniiT^. 



Upper margin of tail serrated by larger scales. Pristiurus. 



Upper margin of tail unarmed. 



Nasal valves confluent, with their hinder 



border entire and free. Scylliorhinus. 



