1900.] 



MR. T. E. BEDDARD ON BASSARICYON ALLENI. 



B67 



surrounding peritoneal cavity. This state of affairs is au 

 exaggeration of what is to be seen in some other mammals. In 



Fig. 4. 



Ovary (ou.) aud oviduct of right side of Cercoleptes. In the right-hand figure 

 the sac containing the ovary and ths mouth of the Fallopian tube is cut 

 open to display these structures. 



the Paca for example the ovary can be perfectly easily pushed into 

 a little pocket, and quite concealed from view when the fold bearing 

 the mouth of the oviduct is drawn over it. It is normally half 

 concealed. 



The Brain. 



The brain of Bassaricyon resembles very closely that of Bassa- 

 i-iscus 1 . The general outline is almost identical. The hemi- 

 spheres diverge posteriorly to display the cerebellum. The crucial 

 sulcus is situated rather anteriorly, and is well marked, curving 

 round laterally after running forwards for a short way. 



In Bassariscus a " lozenge " is not formed, there being in the 

 brain of that animal no forward process of the crucial sulcus on 

 either side to enclose a space. 



In Bassaricyon there are distinct indications of such forward 

 processes, particularly on the right side. But, as will be seen 

 from the drawing exhibited (fig. 5, p. 668), there is nothing like the 

 complete " lozenge " of larger Arctoids. As to this feature in 

 the brain, there is no possibility of confounding Bassaricyon with 

 Cercoleptes, which latter has a fairly well developed " ursine 

 lozenge " ; and in addition the anterior part of the brain lying 

 in front of the crucial sulcus is much more depressed below 

 the level of the rest of the hemispheres than is the case with 

 Bassaricyon, 



The chief longitudinal fissure of the brain, that which divides 

 the sagittal from the parietal gyrus, does not reach the margin of 

 the pallium posteriorly ; it does so however more nearly on the 



1 " On certain points in the Anatomy of the Cunning Bassarisc, Bassariscus 

 astutus," P. Z. S. 1898, p. 129. 



