. A monograph of the genus Casuarius . nty caeca, he points out, are furthermore remarkable in that they open into therectum by a common orifice, thus differing from those of all other birds. The cfeca of the Tinamous resemble those of Casuarius ; Calodromas elegans,however, affords a remarkable exception, differing as it does in this matter from allother known birds. These caeca have been described and figured by Beddard [6].They are much wider than usual, and have the outer walls produced into numerousprominent diverticula decreasing iu size from behind forwards. PHYLOGENT OF THE
. A monograph of the genus Casuarius . nty caeca, he points out, are furthermore remarkable in that they open into therectum by a common orifice, thus differing from those of all other birds. The cfeca of the Tinamous resemble those of Casuarius ; Calodromas elegans,however, affords a remarkable exception, differing as it does in this matter from allother known birds. These caeca have been described and figured by Beddard [6].They are much wider than usual, and have the outer walls produced into numerousprominent diverticula decreasing iu size from behind forwards. PHYLOGENT OF THE PAL^ AND KEOGNATHtE. 251 The following table from Beddard [7] will give at a glance the known variations inthe proportions of the alimentary canal :— iiuicrorJii/ticJiii, $ lUiea mnrrlcaiKt (young) Struthio camcliis, !J ? „ ? I, ,1 c^ d CasuKfiiis inuq)/)! iiilicnJitlus, 2., casiicijiiis hiiuani, 2 ,, picticulUs, d ,, „ hennctti, c? T)fOincn(f norti-JioUandli ausiridix „ , (S. The Liver. The liver, in all the Palceognathce, save Struthio, agrees with that of theNeognatlue in that it is divided into two lobes. In Casuarius and Droiiueus the right lobe is larger tlian the left. A Spigelian lobeis represented. Both Casuarius and Dromceus possess a gall-bladder. In the former the gall opens,in common with the pancreatic ducts, into a diverticulum on the distal loop of theduodenum. In Apteryx the left liver-lobe is larger than the right; the gall-bladder is occasion-ally absent. In Bhea the right and left liver-lobes are equal in size. The gall-bladder isgenerally wanting. 252 MR. W. P. PTCEA^FT ON THE MORPHOLOaT AND Stnithio is remarkable in that, according to Beddard, the right and left lobes arefused into a single heart-shaped lobe. There is a Spigelian lobe. The gall-bladderis wanting ; and there is but a single bile-duct, which opens near the pylorus. Mr. Beddard found the free edge of the liver in Bhynchotus mfescens
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