ora rer ees 
ON HALMATURUS LUCTUOSUS. 273 
In the subgenus Petrogale the stomach is not bifid at its cardiac 
extremity, in which respect it resembles Dorcopsis. In other respects, 
however, it presents considerable differences; it is more capacious 
opposite the cesophageal orifice, and the cardiac portion is bent on the 
rest nearly at right angles, which is not the case in Macropus giganteus 
and Dorcopsis. 
The character of the mucous membrane also deserves attention.* 
In Macropus giganteus, as is well known, the squamous epithelium of 
the cesophagus spreads over most of the stomach also, the pyloric 
extremity, and one of the two cardiac ceca (which is itself bifid) being 
alone lined with a columnar coating. In Petrogale this latter is 
absent, the digestive mucous membrane being confined to the pyloric 
region. Of Dendrolagus inustus Prof. Owen remarks,t “the epithe- 
lium is continued from the cesophagus, for a breadth of 2 inches down 
the posterior surface of the stomach, and of 1} inches down the ante- 
rior surface, and thence is continued, slightly diminished in breadth, 
3 inches towards the pyloric end of the stomach, and 23 inches 
towards the cardiacend. The rest of the cavity is lined with the 
usual gastric vascular membrane, the surface of which is diversified by 
patches of follicular apertures along the upper curvature of the 
stomach, which patches increase in breadth as they approach the true 
digestive portion.” A very similar condition maintains in Dorcopsis 
luctuosa, the only difference being that the squamous lining covering 
the whole of the cardiac cul-de-sac is also found to spread from the 
esophageal orifice along the lesser curvature for a short distance 
towards the pylorus. As in Dendrolagus inustus, two strong parallel 
longitudinal folds run from the cesophageal opening, in this squamous- 
covered mucous membrane, for some distance on the way to the pyloric 
compartment, gradually disappearing before they reach it. 
The small intestine is 97 inches in length, with numerous oblong 
Peyer’s patches distributed throughout its whole distance, averaging 
1} inch long, by } inch across. The cecum and large intestine are 
not sacculated ; the former has a length of 24 inches, and its cireum- 
ference is the same; the latter is 32 inches long, being one-third the 
length of the small intestine, which is the same proportion that 
Prof. Owen{ observed between the same-named viscera of Dendro- 
lagus inustus. The equally short cexcum in the Hypsiprymni differs 
in having two lateral longitudinal bands which scarcely sacculate it. 
* [See, for a full description of this, the paper by Messrs. E. A. Schafer and 
D. J. Williams “ On the Structure of the Mucous Membrane of the Stomach in the 
Kangaroos,” which was communicated to the Zoological Society by Prof. Garrod, 
“* Proceedings of the Zoological Society,” 1876, pp. 165-177.— Eb. ]} 
+ “ Proceedings of the Zoological Society,” 1852, p. 105. 
t Loe. cit. p. 106. 
