NOTES ON THE STRUCTURE OF BIRDS. 
large, has the walls rather thin, but is thickly studded with oval 
glands ; immediately above, we have the usually found plicae, which 
continue upwards until the position of the true crop, where the 
walls become slightly thick and partially glandular. 
The gizzard contained remains of hard coleoptera (among others 
fragments of curculionidm), one or two hard seeds, and bits of 
quartz. The entire length of the intestinal canal measured 51 . 6 . 
At the distance of about 7 from the external pylorus, the hepatic 
duct ( d ) is given off i .3 in length, crossing the regular gall duct 
and terminating in two branches, which, in common with the regular 
gall duct, seem to communicate with a large sinus in the liver. 
About i farther on arises the real gall duct ( e ) curving abruptly 
at about an inch in length, to enter a pyriform gall bladder, and 
at the same time to send a continuous branch (/) to the sinus 
above alluded to. On inflating from the bladder, the communica- 
tion is direct to the duct, the continuous branch not inflating until 
the other has been filled. 
49-2 
