Analytical Synopsis of the Order of Squali. 399 



Family GALEORHmOID^ Gill. 

 Si/nopsia. 

 I. Teeth more or less compressed and with entire or ser- 

 rated sharp edges, Galorhiniin^. 

 A. Spiracles obsolete, 



B. Teeth with no lateral denticles. Gynocephali* 



C. Teeth with the points directed towards the 

 sides, so that the smooth* internal margins are 

 nearly horizontal and present an incisive edge. 

 D. Teeth thick, with the points slender. Physodon. 



DD. Teeth much compressed. ' Scoliodon. 



CC. Teeth with the points, if at all, only mode- 

 rately directed towards the sides, compressed. 

 D. First dorsal scarcely entirely behind the 

 pectorals. 

 E. Teeth above with the base serrated on the 



outer or both sides. Teeth below entire. Hypoprionodon. 

 EE. Teeth more or less serrated in the lower 

 as well as upper jaw. 



Teeth well serrated, above broad and 

 straight in front; below in front straight 

 and claviform. Snout broad and short. Eulamia. 



Teeth scarcely serrated, constricted at the 

 base, claviforip and straight in both jaws. 

 Snout slender, conic. Isogomphodon. 



DD. First dorsal intermediate between pectorals 

 and ventrals. 

 E. Teeth serrated in both jaws. 



Teeth straight in both jaws ; above more 

 or less constricted near the base and cla- 

 viform. Snout short, conic, Lamiopsis. 

 Teeth curved outwards and often flexuous ; 

 outer margin with its upper and under 



* The synopsis of the genera of this group is to be consulted with much cau- 

 tion. At another time a more perfect one will be given and the genera more 

 rigorously restricted. 



DEC, 1861. 28 ^^^- ^^'''- '^^'^- ^^'^^' ^^^- ^'^- 



