386 Analytical Synopsis of the Order' of Squall. 



Family III. Galeidse=Galei, Scylliodontes, Musteli Mali, and Henle. 

 (D.) Sharks, with two dorsals and anal ; the first dorsal over the space 

 between the pectorals and ventral?. Spout holes, but no nicti- 

 tating membrane. 



Family IV. LamnidjEr^Lamnse, Odontaspides Miill. and Henle. 



Family V. Alopeciidse = Alopecioe Miill. and Henle. 



Family VI. Cestraciontid{E = Cestraciontes MUll. and Henle. 



Family VII. RhinodontidjemRhinodontes Miill. and Henle. 

 (E.) Sharks, with one anal and only one dorsal. 



Family VIII. Notidenid£e=:Notidani MUll. and Henle. 

 (F.) Sharks, with spout-holes. Two dorsals ; no anal ; no nictitating 

 membrane. Five gill-openings, all before the pectorals. Intes. 

 tinal valve spiral. 



Family IX. Spinacid8e=Spinaces Mull, and Henle. 



Family X. Scymnidse = Scymni Miill. and Henle. 



Family XI. Squatinidse = SquatiniB Mull, and Henle. 

 (G.) Sharks, similar to those of division B. in having a nictitating mem- 

 brane and no spout holes, and in the position of the spineless 

 dorsals ; but with a lateral extension of the skull at the orbits' 

 which is greatest in the adults. 



Family XII. Zygsenidae. 



This distribution, if we except the division of the Nictitantes 

 into two families, is similar to that of Owen ; it differs from 

 the one of Miiller and Henle by the union of the families of the 

 first and second divisions of the second section into families 

 corresponding to those sections, after the exclusion of the ham- 

 mer-headed sharks. The latter are retained as a family at the 

 end of the sub-order of Squali. The genus Ilemigaleus, of Blee- 

 ker, has been rather carelessly placed among the Torpedinoidse.* 



* The family of Torpedinoidse or Narcaciontoidte may be thus arranged. 

 Disk pyriform, formed by the union of tlie true disk with the 

 ventrals, which are united beneath the tail. Tail very 

 short. Head emarginated in front. Sjnracles far behind 

 eyes. Teeth with three point?, Hyfnin^ 



Dorsals two. Hypnos. 



