ARBEIDiE.] OSTEOLOGIA AVIUM. [PlATALINJE, 



Measurements. 



Tenths. 



Length of humerus ..... 70 



Length of ulna 82 



Length of metacarpus 35 



Length of femur 38 



Length of tibia 80 



Length of metatarsus ..... 61 



Length of sternum 35 



Tenths. 



Breadth of posterior margin of sternum 12 



Breadth of anterior margin of sternum 1 7 



Depth of keel 10 



Length of head 70 



Breadth of head 13 J 



Length of pelvis 46 



Breadth of pelvis 16 



Ardea. 



Exilis. 

 Besides the above I have specimens of A. visrescens, Nivea, Candidissima, Ccerulea, 

 RubicolliS) and Purpurea, all of which are similar. 



Botaurus, 8teph. 



§tellaris, Linn. 

 The principal distinction between this genus and Ardea is the comparative lengths 

 of the metatarsus and tibia 



Nyctyceorax, Stepk. 



Griseus, Linn. 

 Also similar to Ardea. 



Cancroma, Linn. 



Cochlearia, Linn. 



I have only an imperfect cranium of this bird : it has a channel on the vertex, and 

 an elevated ridge over the top of the bill; nostrils small ; orbits large, and elongated. 

 Palatine bones broad, placed horizontally, the hinder portion missing; inferior 

 maxillary very slightly elongated beyond the condyles, the edge curved much down- 

 wards. 



Platal^a, Linn, 



Leucorodia, Linn. 

 Cranium with a very slightly marked depression between the orbits, without any 

 depression at the base of the nasal bones ; occipital ridge slightly marked ; orbital 

 septum with two small foramina. Palatine bones with their edges for the first half 

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