THE LOCOMOTION OF THE LORISES,WITH SPECIAL REFERENCE TO THE POTTO

The stealthy locomotion of the lorises is seen to be directly related to catching prey such as insects and roosting birds. The method of stalking prey contrasts strongly with the quick leaping method of food-catching presented by the galagos. The lorises, by virtue of their food-catching habits, are restricted to true forest, whereas some of the galagos, by the same token, have colonized more open country. This throws some light on the nature of the post-Miocene link between Africa and Asia and is suggested as a reason why the galagos are restricted to Africa whereas the lorises are found in both Africa and Asia.     

THE NASAL APPARATUS IN DIPNOI, WITH SPECIAL REFERENCE TO PROTOPTERUS

An investigation is made of the homology of the nasal apparatus of the Dipnoi, in order to determine whether the posterior naris is homologous with the choana of tetrapods or with the posterior external naris of fishes. The ontogeny of the nasal capsule of Protopterus is described in detail. The nervous and venous systems of tho snout region of Protopterus are also duscrbed. It is found that whereas the pattern of the nervous and vascular systems is very similar in all Dipnoi, the structuro of the nasal capsule in the Lepidosiren-Protopterus stock differs greatly from that of the Neoceratodus stock. the homology of the various components of the depnoan nasal coasule is revised and it is shown that there are no evidences of a direct relationship of the Dipnoi with the tetrapods. It is further concluded that the posterior naris of Dipnoi is homologous with the posterior external naris of fishes.