Genus— P SEUDOPRION. 
Pseudoprion Coues, Proc. Acad. Nat. Sci. Philad., 1866, 
p. 164 Type P. turtur. 
A VERY distinct Prionitic genus, agreeing with the other Prionitic genera in 
general, hut with a noticeably different style of bill. 
The nail is strong and almost half the length of the chord of the culmen, 
while there is very little space between it and the nasal tube. The under 
mandible is strong, and the strong rami diverge at an acute angle enclosing 
a triangular fully-feathered interramal space. The whole bill recalls that of 
Fuhnarus. 
I have pointed out that I consider Coues’s generic description to apply 
to this genus, rather than to the succeeding Heteroprion ; if my reasoning 
should be considered invalid and Pseudoprion should be utilised for my genus 
Heteroprion, I would propose that Fuhnariprion be then resorted to for the genus 
I have here described, and I would select as type, my subsp. Pseudoprion turtur 
crassirostris, hereafter described. 
I here give figures of the bill of Pseudoprion turtur crassirostris and 
Heteroprion helcheri, for comparison. Note the extreme development of the bill 
of the former, so that it recalls at once that of the Fulmar. 
1, Psendoprion turtur crassirostris, adult. 2. Heteroprion helcheri, adult. ^ 
3. P. turtur crassirostris, adult. 4. Pseudoprion turtur huttoni, immatxire. 5. Heteroprion hetbheri, adult. 
In Nos. 3 and 5 I give a top view of the same two for a Hke purpose, 
while I have also added that of a very young specimen of P. turtur huttoni, 
showing that the difference between the two genera is well marked even when 
a juvenile of the one is compared with the adult of the other. This is 
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