Genus— ACANTHORNXS. 
Acanthoknis Legge, Papers Proc. Roy. Soc. Tasm., 
1886, pp. 236, 240, 1887. Type (by monotypy) Acanthizci magna Gould. 
This genus is apparently the Tasmanian development of Sericornis frontalis 
and is all Sericornine in detail, save the arched bill and, of course, the more 
rounded wing and longer legs. 
The bill is long and the culmen is strongly arched, the tip delicately 
decurved, the sides strongly compressed ; the nasal groove about one-third 
the length of the bill with the frontal -feathers projecting and obscuring the 
linear nostrils ; the under mandible slight ; the rictal bristles pronounced. 
The wing has the fifth and sixth primaries longest, the fourth a little 
shorter and equal to the seventh ; the third longer than the eighth and much 
longer than the second which is less than twice the length of the short first ; 
the secondaries are longer than the second, but shorter than the third 
primary. 
The tail is long and rounded. 
The legs are long and the feet small ; the front of the tarsus is booted and 
the hind part bilaminate ; the toes are weak, claws small ; the outer toe and 
claw slightly longer than the inner toe and claw which is equal to the middle toe 
alone ; the hind toe and claw are equal to the middle toe and claw, the hind 
claw being longer but not much stronger. 
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