ON THE VISCERAL ANATOMY OF THE MARSUPIALIA. 851 



43. Contributions to the Visceral Anatomy and Myology 

 of the Mai'supialia. By Chaeles F. Sonntag, M.D.^ 

 F.Z.S., Anatomist to the Society. 



[Received October 5, 1921 : Read November 22, 1921.] 



(Text-figuies 70-79.) 



Contents. 



Page I Page 



Ventral Mesentery 851 [ Urinary Organs 867 



Adipose Tissue 851 ! Ductless Glands 868 



Cervical Lympliatic Glands 851 I Respiratory Organs 870 



Muscular System 852 Vagus and Sympathetic 873 



Mouth 854 1 Systematic 877 



Salivary Glands 857 i Sumruary and Conclusions 880 



Alimentary Canal 861 ; Bibliography 881 



Organs of Circulation 865 



The present paper is based on the examination of several 

 Polyprotoclont and Diprotodont Marsupials * which died in the 

 Society's Gardens ; and the material comprised botii fresh and 

 preserved specimens. 



I have used my paper on the Koala and Yulpine Phalanger for 

 purposes of comparison (15), and I have drawn attention to the 

 difierences between the anatomy of Ferameles obesula and that of 

 Ccenolestes ohscuriis^ recently described by Osgood (9). 



Wlien the abdomen of Dendrolagus ursinus was opened an 

 avascular peritoneal fold, representing the remains of the ventral 

 mesentery, was seen running from the pelvic floor posteriorly to 

 beyond the urinary bladder anteriol•l3^ Beddard (1) observed a 

 similar condition in D. hennetti and Ornithorhynchus. 



Adipose Tissue: — Owen (10) states that the omentum of the 

 Opossums has no fat when there are accumulations elsewhere. 

 In Petaurus sciihreus the omentum is heavily laden with fat, and 

 there are deposits in other parts. The fat in the anterior joart of 

 the thorax contains the thoracic lobes of the thymus gland. 



Cervical Lympliatic Glands : — The relative positions of the two 

 groups of glands in the Marsupialia have already been described 

 in my paper on the Koala (15), but the number of glands in each 

 varies. The anterior group has only one in Ferameles obesida 

 and Ccenolestes ohscurus, but several are present in Dendrolagus 



* Didelpliyidse : Didelpliijs azarce, D. marsupialis, D. alhiventris, Metachints 

 opossum, Philander laniqer, Marmosa elegans ; Dasyuridai : Dastfurus viver7-vmis, 

 SarcopJdlus liarrisi ; Peramelida} : Ferameles obesula ; Macropodidaa : Macropus 

 hennetti. 31. giganteus, 31. rufus, 31. melanops, Dendrolagus ursinus, Onyclwgale 

 lunata, Betiongia penicillata ; Phalangeridae : Petanriis sciureus, F. hreviceps, 

 F. brevicep>s papuanns, Fsendochirus peregrinus, Fhalanger orientalis, Petaurus 

 australis. Duplicates of some adult forms, and a number of pouch specimens of 

 different ages were examined. 



