228 



SALENIADtE. 



A Table showing the Classification of the SALENIADiE. 



Family. 



Sections. 



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Diagnosis. 



Genera. 



Inter-ambulacral tubercles large ; apical 



disc small and not prominent ; sur-anal \ Acrosalenia, Agassiz. 

 plate composed of one or many pieces ; 

 vent posterior and excentral. 



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' Inter-ambulacral tubercles moderate; api- 

 cal disc large and prominent ; genital 

 plates in the form of elongated lobes ; 

 sur-anal plate single ; vent posterior and 

 slightly excentral. 



Inter-ambulacral tubercles large, few in 

 number ; apical disc large, and forming 

 a regular pentagon, with elevated angu- 

 lar carinas independent of the sutures ; 

 sur-anal plate angular; vent large, ex- 

 central, oblong, and posterior. 



Inter-ambulacral tubercles large ; apical 

 disc large, prominent, and shield-like ; 

 border undulated, with punctuations or 

 sculpture in the lines of the sutures : sur- 

 anal plate single, central ; vent excentral, 

 posterior, and inclined to the right side. 



Inter-ambulacral tubercles very large ; 

 apical disc large and very solid, with an 

 undulated circumference ; surface of the 

 large plates ornamented with punctua- 

 tions, or sculptured figures along the 

 line of the sutures ; sur-anal plate single ; 

 vent excentral, and directed towards the 

 right side. 



Peltastes, Agassiz. 



Goniophorus, Agassiz 



Hyposalenia, Desor. 



\ Salenia, Gray. 



