NATURAL SECTIONS. 



The following diagram assists the 



21 



these sections 



eye in appreciating the natural relationship of 



I.-LONGIROSTRES. 



DIAGKAM 1 



QuMi-natural s«tioni of (r«iu« 

 J'tdicularit freneth really di*p<>v<d. 



II.-ADUNCiE. 





III.-EROSTRES 





The system now proposed is after all a simplification at the expense of 



some 



natural affinities. But it is offered as an approximation to a natural disposition that at 

 the same time possesses the compactness requisite in a systematic arrangement. 



The relation that this system bears to that of Mr. Maximowicz remains to be 



Both attempt to do what it is perhaps impossible with this genus to succeed 

 to show compactly the natural disposition of its component groups. Aud the 



noticed. 



in 



doing 



subjoined table ghows that the two systems are practically identical. 





