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AUSTIN HOBART CLARK, 



of which the apices are roughly Luzon, Singapore and New Guinea; yet, 

 considered in detail, it is found to possess certain striking and charac- 

 teristic features. Chief among these are 1) the absence of any represen- 

 tatives of many widely ranging- families, genera and species ; 2) the pre- 

 dominance of the species of the Oligophreata over those of the Macro- 

 phreata, the latter only making up about 4% of the total; 3) the occurrence 

 of nearly 50% f peculiar local forms, 35% being purely tropical and 

 15% southern, yet immediately derived from tropical stock; and the 

 curious exaggeration of the differential characters in almost all of these. 



The Australian crinoid fauna is divisible into two parts, 1) the tro- 

 pical, with about 85% of the species, inhabiting the northern coast and, 

 becoming progressively more and more attenuated, extending south on the 



