ON THE ANATOMY OF CHAUNA DERBIANA. 329 
In Chauna the angle of the mandible is much prolonged and up- Page 197. 
curved, as in the Anseres, from which it however differs in not being 
deeply excavated in the interval between the upturned process and 
the inwardly-directed articular angle. It must be remembered that 
the mandible is much the same in the Galline. 
It must also be remembered that the Screamers are the only birds 
in which there are no uncinate processes to the ribs, as has been shown 
by Mr. Parker. 
TABLE. 
Postacetabular sie nas 
Wane of Expansor Biceps slip to Obturator portion of ten- 
family. secundariorum | the patagium internus " sor fascise 
(see p. 323) (see p. 324). | (see p. 325) (see p. 325). 
TINAMID2 .. Ciconine. Absent. Triangular. Large. 
PALAMEDEID .| Ciconine. Absent. Oval. Absent. 
GALLINZ ......| Present (vide | Absent only in | Triangular. Large. 
p. 324). Cracide 
RALLipz ....,.| Ciconine. Present. Trian Large. 
SITIOS ota Ciconine. Absent. Oval. Present. 
Cariama.......| Ciconine Absent. Triangular. Present. 
Phenicopterus..| Ciconine. Present. Oval. Present. 
Serpentarius....\ Ciconine Absent. i ¥ Absent. 
MusopHacipz .| Ciconine Absent. Triangular. Present. 
CucuLipz2 .....| Ciconine Absent. Triangular. Present. 
PsitTact.......}| Absent. Absent. pesbecvece veces | AUBORE 
ANATIDE «.| Ciconine Present. Peculiar from | Present, except 
Cygnine, pe: elongation of | in Cygnine. 
culiar in pelvis. 
others (vide 
p- re 
SPHENISOIDE ..|........00ce0e|oeceeeeeeees-| Lriangular. Absent. 
CorymBrpx ....| Not seen. Present. ? Present. 
Popiciripz....| Not seen. Present. Oval. Present. 
zz | P ? ? ? 
FULMARIDz....| ? ? Oval. Absent. 
PELARGI .+| Ciconine. Absent. Oval. Absent, or ex- 
; tremely small 
CATHARTID2 .. .| Ciconine. Absent. i Present. 
HERODIONES ...| Ciconine (not | Absent, Triangular. Absent, or ex- 
in Cancroma tremely small, 
and Egretta). 
STEGANoPopEs .| Absent. Absent, except | Oval. Absent. 
in Phalacro- 
coracide. 
AccrpiTrEs ....| Absent (not in | Absent. Triangular (ex- | Absent. 
Faleo, Poly- cept Neo- 
borus and phron). 
Tinnunculus). 
STRIGIDZ .....| Absent, Absent Triangular (not | Absent. 
Scops). 
CoLUMBz...... Feeble or ab- | Present. | Present. 
sent. 
CHARADRIID2 ..| Ciconine Present. Oval. Present. 
GRUIDZ ......| Ciconine Present. Triangular. Present. 
LaRIDZ........ In some. Present. Oval. Absent. 
ALCID2........| Absent. Present. _| Oval. Present (not 
in Arctica 
alle ?) 
