NERVOUS SYSTEM. VERTEBRATA. 157 



of the cerebellum and is a narrow insignificant strip, which 

 is expanded laterally only to a very slight degree. The 

 region of the nodulus agrees with that of other mammals. 

 The floccular lobe is sessile in Tachyglossus, but projects for 

 a considerable distance in Ornithorhi/nchus. It is a simply 

 foliated appendage, and is not divisible into flocculus and 

 paraflocculus ; nor can a ventral and dorsal segment be 

 recognised as in other mammals, although the radiating 

 feather-like arrangement of the folia in Tacliyglossus is a 

 simplified form of the two-layered type of paraflocculus. 



The cerebellum differs in a most marked manner from 

 that of other mammals, and seems to be a highly specialised 

 modification of the primitive mammalian type. Its most 

 significant feature is the relatively small size of its lateral 

 parts. Seeing that most of its exposed part probably 

 represents the anterior lobe of the mammalian cerebellum, 

 in which there is no clear line of demarcation between 

 vermis and lateral hemispheres, such distinctions are also 

 lacking in the Monotreme. 0. C. 1323**. 



Ziehen, Semon's Forschungsreise, Jena. Denkschr. 1897, 

 p. 23. 



D. 196. The cranial cast of a so-called " Proechidna " (Proechidna 

 bruijni). 



The brain is distinctly larger than it is in T. aculeatus ; 

 the olfactory bulbs project much further beyond the hemi- 

 spheres ; the hemispheres are proportionately much longer 

 than in the other species and are extremely large and 

 richly convoluted for so lowly a mammal. 



Gervais, Nouv. Arch. Mus., t. v. 1869, pi. xiv. 



OKDER MARSUPIALIA. 



Suborder POLYPROTODONTIA. v 



Family DASYURID^E. 



D. 197. The brain of a Tasmanian Devil (Sarcophilus [Dasyurus] 

 UTsinus) ( ? ), in which the left cerebral hemisphere has 

 been separated from the rest of the brain. 



