air-cells apparently not extending along the neck, or beyond the 

 abdominal cavity, except to penetrate the osseous system; but of 

 this I cannot speak with safety, as the bird was skinned before I dis- 

 sected it. 



" The eye of the Touraco is large, measuring 7 lines in lateral 

 diameter. The lens is very convex posteriorly, and its capsule is 

 attached to a narrow maraupium. 



" The clavicles were united, forming an os Jurcatorium ; but they 

 were extremely weak, and yielded with facility at the point of union. 

 The keel of the sternum was of moderate size, its greatest depth 

 being to the length of the sternum as 1 to 4. The posterior mar- 

 gin of the sternum has two notches on either side of the keel, as in 

 the Toucan; the lateral ones extending along two thirds the length 

 of the sternum, the mesial ones about one third. 



" After this detail it is scarcely necessary to observe that in all 

 the important points of the internal structure the Tourcco manifests 

 close relationship to the Scansorial order, and a marked deviation 

 from the typical structure of the Rasores, in which the superadded 

 lateral dilatations of the alimentary tube, the crop and cceca, are so 

 largely developed. 



" The same affinity is also shown in the nature of its parasitic 

 worms, — the Teenies belonging to the species Jiliformis of Ru- 

 dolphi, so remarkable for the length and tenuitj' of the body, and 

 which has hitherto been met with only in the Psittacidce . 



" 1 had an opportunit)' in this instance of witnessing very satis- 

 factorily the mode of generation of the Tesnia. Many separate 

 joints were found in the track of the intestines, which, when viewed 

 under the lens, were seen full of ova. Each of these joints contained 

 from thirty to thirty-three ova, of a subglobular form, and a sur- 

 face rendered irregular by minute asperities. The posterior joints 

 of the unbroken worms were similarly distended, and readily sepa- 

 rated. 



" This division of the body approximates to the fissiparous mode 

 of generation; but as the joints are merely the capsules of the ova, 

 it is more strictly analogous to the mode of generation in the 

 LerncecB and Entomostraca." 



