AnalytiGal Synopsis of the Order of Squall. 385 



consideration. The work itself is a useful one, and not only 

 contains the translations of the characters of the groups of Miil- 

 ler and Henle, but the synonymy is copied with some additions, 

 and is very full and generally reliable ; a review is also given 

 of some of the previous arrangements of these fishes. 



16. — M. A. Dumeril, in a monograph of the Scyllioids,* pro- 

 posed the division of the sub-order of Squali, which he regarded 

 as a family, into four tribes, equivalent to the sections of Miiller 

 and Henle, whose characters he thus expressed. 



Groups, 

 f distinct, ftwo ; the ( above or behind the ventrals . I 



I dorsal -I first ( between the ventrals and pectorals. 11 

 Anal fin. < \ ^^_ 



(^ one ....... Hi 



(^ none . IV 



17. — Sir John Richardson, in the essay on " Ichthyology," in 

 the last edition of the " Encyclopeedia Britannica," adopted the 

 following arrangement. 



(A.) Sharks, with an anal fin and the dorsals far back; the first being 

 behind the ventrals. 

 Family I. Scylliidae=Scyllii Miiller and Henle. 



(B.) Sharks, with two dorsals and an anal ; the first dorsal over the 

 space between the pectorals and ventrals. A nictitating mem- 

 brane. No spout holes; the last two gill openings over the 

 pectoral. 

 Family II. Carcharidse. 



Genera. I. Carcharias JHZ-ii^^e/* and Henle. (Sub-genera I. Scoliodon. 

 11. Physodon. III. Aprion. IV. Ilypoprion. V. Prionodon.) 

 11. Prionodon Milll, and Henle. The last name has been inad- 

 vertently substituted for Tricenodon. 



(C.) Sharks, with two dorsals and an anal ; first dorsal between the pec- 

 torals and ventrals. A nictitating membrane. Spout holes. 

 The last two gill openings over the pectoral. 



* Monographie de la tribu des Scylliens ou Roussettes (Poissons Plagio- 

 stomes), comprenant deux especes nouvelles, par M. le docteur Auguste Dumeril 

 in Revue et Magasin de Zoologie pure et appliquee, 2e serie — t. v,— 1853, pp. 8, 

 73, 90, 119. 



