AND MYOLOGY OF THE MARSUPIALIA. 



857 



the Koala and Vulpine Phalangei" (15). They are not surrounded 

 by a cushion. 



The characters of the palate can be conveniently expressed by 

 means of formulae. In the following list denotes complete 

 I'idges, I incomplete ridges, P incisive pad, T incisive tubercles, 

 fl a median incisive ridge or raphe, and U uvula. For the area 

 surrounded by the incisor and canine teeth the term ^^ incisive 

 area" is suggested. 



POLYPKOTODONTS. 



Metachirus opossum CyloP IT — 

 Philander laniger . . . Cyl^P + IT — 

 Didelphys azarse . . . CtjI^P + U — 

 „ marsupialis Cgl^P + U — 

 Marniosa elegans ... CgloP — U— 

 Perameles ohesula . . . Cj^jIjP + U — 

 Dasyurus viverrinus C^^IgP + U — 

 Sa7-cophilus harrisi.. . C-I5P + U — 



DiPROTODONTS. 



Phascolarctos cinereus CgloTXJ— 

 Trichos^irus vulpecula CgloP — U— 

 Pseudochirus pere- 



grinus c.,IoP-U — 



Petaurus sciureus . . . C^IoTU — 

 „ breviceps pa- 



piianns CyloP + U — 



Coenolestes obsr.wus . . . CgljP + U — 

 ^pyprymnus rufescens C-IoRU — 

 Dendrolagus (all 



species) CyloP + U— 



Macropus (all species) C^IoP + U— 

 Onychogale lunata . . . CjjIoP+U — 

 Phalanger orientalis . . . CgloP+U — 



The only Marsupial in the above list in which the palate 

 narrows from before backwaixls is JSpyprymnus rufescens. In 

 the Peramelids the palate is long and narrow. 



I have nothing to add to existing descriptions of the tonsils 

 and fauces. And in no Marsupial could I detect Waldeyer's 

 lymphatic ring in the pharynx. 



The Salivary Glands (text-*figs. 71-74). 



The Parotid Glands (m) are small in all Polyprodonts, but vary 

 considerably in thickness and superficial extent in the Dipro- 

 todonts. They are thick, and extend from the auricles to the 

 clavicles in Dendrolagus and Dorcopsis, and Garrod has figured 

 their surface markings in the latter (4). Their relations in the 

 former are shown in text-fig. 74 ; and the ducts, which are 

 capacious and thin-walled within the glands, become thicker and 

 contracted where they cross the masseter muscles. They are 

 equally thick, but only reach the middle of the neck in Phasco- 

 larctos cinereus. And in none of these genera do they pass 

 mesially to the inner borders of the sterno-mastoid muscles. In 

 other genera they are thin, and cover a variable extent of the 

 neck. They reach the clavicles in Petaarus, but do not extend 

 so far in Macropus, Mpyprymnus, and Onychogale. 



The most extensive parotids are present in Pseudochirus pere- 

 grinus, in which they extend from the aui"icles to the clavicles, 



57* 



