672 ME. F. B. BEDD.VRD OS BVSSABICV'OS ALLBNI. [June 19, 



The Plantaris is totally absent. This is very unusual, but there 

 is no possible doubt about it. 



The Soleus, on the other hand, is present. The muscle arises from 

 the head of the fibula, and so it cannot possibly be confounded with 

 the plantaris, which of course has a femoral origin. Moreover its 

 fibres also partly arise from the septum between itself and the 

 peroneal. Its tendon joins that of the gastrocnemius. 



Of the Flexores tibialis andjibularis and the Tibialis posticus I 

 have nothing to say save that they were present and quite normal. 



The Tibialis anticus has a double tendon of insertion, and the 

 muscle itself was double the smaller and lower portion, arising 

 entirely from the fibula, while the larger half arose from both tibia 

 and fibula. The lower half appears to be the equivalent of the 

 extensor proprius hallucis, since its tendon is continued to the end 

 of that digit ; while the tibialis anticus proper is attached to the base 

 of the first metacarpal by its much stouter tendon. 



The Extensor longus digitorum is not remarkable. It has a long 

 tendon of origin from the femur and a fleshy origin from the head 

 of the fibula. 



I found the three Peroneals mentioned by Perrin in Cercohptes. 



Osteology . 



As has already been mentioned, both species of Bassaricyon have 

 been described as regards the skull and teeth by the three gentle- 

 men who have dealt with those two species. In order to make the 

 present account of the skeleton more complete, I shall recapitulate 

 the main features in the skull as well as of the other bones, com- 

 paring them with the corresponding bones of Cercoleptes. 



On the palatal aspect of the skull, it is seen that the palate of 

 Bassaricyon is wider than that of Cercoleptes, and increases in width 

 from before backwards as far as the end of the series of teeth ; its 

 form is thus roughly triangular, as compared with an oval form in 

 Cercoleptes. This feature appears to be more marked in B. alleni 

 than in B. gabbi. The length of the zygomatic arch from before 

 backwards where it becomes confluent with the tooth-line is greater 

 than in Cercoleptes. The anterior end of the palate at the insertion 

 of the incisors is almost semicircular in outline in Bassaricyon, and 

 nearly straight in Cercoleptes. In Bassaricyon the tympani bulla? 

 extend laterally and posteriorly nearly to the edge of the skull ; 

 in Cercohptes there is a considerable flattened area of bone in this 

 situation. The paroccipilal processes, which are not long in either 

 genus, thus come to lie close to the tympanic in Bassaricyon and 

 some way away in the Kinkajou. 



On the lateral aspect of the skull, the chief difference which is 

 apparent is that the zygomatic arch in Bassaricyon is arched morp 

 strongly upwards than in Cercohptes. The infra-orbital foramen is 

 visible on this view in Cercoleptes ; it is not in Bassaricyon. The 

 last molar lies behind the maxillary part of the zygomatic arch in 

 Cercohptes ; this is not the case with Bassaricyon. 



