KHAMPHASTIDiE.] 



OSTEOLOQIA AVIUM. 



[RHAMPHASTIM. 



Fam. 2. EHAMPHASTIDJE. 



Subfam. Rhamphastin^e. 



Rhamphastos, Linn. 



Erythrorhynchus, Gm. 



Type of Rhamphastidse. 



Cranium with the orbital septum entire ; impression of the masseter muscle not so 

 distinct, or carried so far backwards, as in Centropus ; inferior mandible not perforated by 

 a foramen ; nostrils very small. Palatine bones similar in shape, but with the posterior 

 portion more elongated. 



Sternum rather small ; the posterior margin with two fissures on each side, the outer 

 one larger ; the inferior edge of the keel nearly straight ; anterior edge produced to the 

 end of the manubrial process, very slightly scolloped out ; lateral margins much produced 

 anteriorly. Furculum with the rami not united, consisting merely of a tapering strip of 

 bone. Coracoids long. Scapula rather broad, curved downwards. 



Pelvis with the ilium not projecting over the ischium at their hinder extremities, but 

 projecting over it for the anterior half of the space between the cotyloid cavity and its 

 hinder margin, without any dorsal ridge. Ischiadic foramen large, oval; obturator 

 foramen more open than among the Cuculidce; the os pubis not being united to the 

 ischium except at its extremities, and projecting in front in the shape of a small knob. 

 Remaining bones similar to the Cuculidce. 



Measurements. 



Tenths. 



Length of humerus 22 



Length of ulna 34 



Length of metacarpus 11-^ 



Length of femur 22 



Length of tibia 34 



Length of metatarsus 20 



Length of sternum 20 



Tenths. 



Breadth of posterior margin of sternum 12 



Breadth of anterior margin of sternum 12 



Depth of keel 4 



Length of head ....... 57 



Breadth of head . ....... 16 



Length of pelvis 29 



Breadth of pelvis 13 



Rhamphastos, Linn. 



Tucanus, Linn. 

 In structure precisely similar to the foregoing. 



Pteroglossus, III. 



Bailloni, Vieill. 



The only distinction between this genus and the foregoing appears to be in the 

 position of the nostrils, and in having the furculum perfect^ although small. 



vol. i. o 93 



