30 AN INTRODUCTION TO ZOOLOGY 



bear at their postro-lateral corners two small, easily detached lobes, 

 the paraflocculi, situated within the floccular fossae of the cranium. 

 The whole of the surface of the cerebellum is marked by close set, 

 almost parallel, and for the most part transverse folds or sulci. 

 The ventral portion of the metencephalon is composed of a trans- 



OL 



OT 



FL 



RF 



OX 



XII 



sc 



FIG. 113. Brain of Lepus. Ventral view. 



C.C., crus cerebri ; C.T., corpus trapezoideum ; F., flocculus ; F.L., frontal lobe ; H.L., hippo- 

 campal lobule ; I., infundibulum ; M., medulla ; O.L., olfactory lobe ; O.T., olfactory tract ; 

 O.X., optic chiasma ; P., paraflocculus ; Pi., pituitary body ; P.V., pons Varolii ; R.F., rhinal 

 fissure ; S.C., spinal cord ; T.L., temporal lobe ; V.P., ventral pyramids ; II.-XIL, roots of spinal 



versely running broad band of fibres, the pons Varolii, which connects 

 the two sides of the cerebellum across the mid ventral line. 



The myelencephalon is composed of a somewhat flattened mass, 

 the medulla oblongata, whose roof is formed by the posterior choroid 

 plexus which, however, is hidden beneath the enlarged cerebellum. 

 On its ventral surface we can recognise two narrow longitudinal 



