' 238 THE ANATOMY OF THE COLUMBA. 
Page 257. 
Length of 
Name of bird. intestine. 
ft. in. 
Palopis MOAB vas. one a ch ot ee 0 11 
melamocephalus......-.sscccseseces 0 9 
Starneenas cyanocephala .......020e0200s 2 10 
TVOron COWS Soest Cees pth eee nS eee 2 44 
Turtur didabramis 20. 33. vcne vay on eee 1 8 
CHONG a ce eae eters peste is 
Zenaida martinicana..........6+.. eae ee y Kea 
Zenaidura carolinensis ......-+ +00 eevee 20 
In nearly all Pigeons the gizzard is well-developed after the ordi- 
nary type; in some the pad on which the food is triturated is 
longitudinally grooved or plicated, whilst in others it is smooth; its 
ossification in the Nicobar Pigeon (Calenas nicobarica) has already 
attracted attention.* In Carpophaga the stomach is very feebly 
muscular, not being more powerful than in strictly fruit-eating birds, 
such as the Hornbills. It is in the genus Ptilopus that a form of 
gizzard is developed such as is not found in any other bird. In 
P. marie, P. melanocephalus, and P. jambu it is exactly the same, 
being composed of four pads instead of two. A horizontal section of 
an ordinary gizzard presents the well-known section represented in 
fig. 2, b, it being composed of two muscular masses, which push the 
two pads together in a manner which I have explained elsewhere. 
But in Ptilopus the section is much more elaborate, in a direction to 
which no other gizzard is known to approach; so that by the gizzard 
alone the genus whence it came could be determined with certainty. 
The accompanying figure (a) represents the section made exactly in 
Fig. 2. 
Horizontal section of the gizzard of :—a. Ptilonopus jambu ; b. Treron calva. 
”? 
* See Prof. Flower’s observations, ‘‘ Proceedings of the Zoological Society, 
1860, p. 333, and Mr. Bartlett’s note, 73. p. 99. 
+ “Proceedings of the Zoological Society,’ 1872, p. 525. (Supra, p. 105.) 
