356 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Dendrolagus (Figs. 1 and 2). 



So far as I can find, only two descriptions of the 

 visceral anatomy of this genns are in existence. 

 Beddard* has described the abdominal viscera, certain of 

 the great bloodvessels and the brain ; Owent gave some 

 notes on the anatomy of a different species, and refers to 

 the unusual size of the parotid glands. In the specimen 

 I dissected, the superficial thymus was found with no 

 other dissection than dividing the skin and platysma along 

 the middle ventral line of the neck, and reflecting back 

 the folds. The organ had two lobes of nearly equal size, 

 the largest of which had a longitudinal diameter of about 

 20 mm., and a transverse diameter of 13 mm. It was 

 situated on the upper part of the thoracic wall, covered 

 only by skin and platysma, and lay mostly posterior to the 

 anterior extremity of the sternum. The external jugular 

 veins were connected by a wide anastomosing vessel at 

 the transverse level of the angles of the lower jaw. The 

 submaxillary glands were situated in the angles of the 

 three vessels so formed. External to the jugulars, and only 

 separated by these from the submaxillary glands, were 

 the parotids, large thin sheets of glandular tissue, about 

 23 mm. in length, extending backwards to the ears on the 

 lateral surfaces of the neck. All these glands were 

 hardened, imbedded in paraffin, and sectioned. The pre- 

 servation of the tissues was very bad, and no more of the 

 minute structure of these organs could be ascertained than 

 sufficed for their identification. In the thymus no obvious 

 distinction into cortical and medullary portions could be 

 made out. Hassall's corpuscles were however present. 



* On the visceral anatomy and brain of Dendrolagus bennetti. 

 Proc. Zool. Soc, 1895, pp. 131-137. 



f Notes on the Anatomy of the Tree-Kangaroo (Dendrolagus inustus). 

 Proc. Zool. Soc, 1852, pp. 103-107. 



