Prof. Owen on a Relic of an unknown Strut hious Bird. 167 



other ridges or line£e asperse traverse longitudinally the posterior 

 concave side of the shaft ; one of them is broad and rugged, the other 

 is a mere linear rising. 



" The texture of the bone, Avhich affords the chief evidence of its 

 ornithic character, -presents' an extremely dense exterior crust, vary- 

 ing from one to two lines in thickness ; then there occui*s a lamello- 

 cellular structure of from two to three lines in thickness. The la- 

 mellae rise vertically to the internal surface of the dense wall, are 

 directed obliquely to the axis of the bone, decussate and intercept 

 spaces which are generally of a rhomboidal form, and from two to 

 three lines in diameter. This coarse cancellated structure is con- 

 tinued through the Avhole longitudinal extent of the fragment, and 

 immediately bounds the medullary cavity of the bone, which is about 

 one inch in diameter at the middle, and slightly expands towards 

 the extremities. There is no bone of similar size which presents a 

 cancellous structure so closely resembling that of the present bone 

 as does the femur of the Ostrich ; but this structure is interrupted 

 in the Ostrich at the middle of the shaft where the parietes of the 

 medullary, or rather air-cavity, are smooth and unbroken. From 

 this difference I conclude the Struthious bird indicated by the pre- 

 sent fragment to have been a heavier and more sluggish species than 

 the Ostrich ; its femur, and probably its whole leg, was shorter and 

 thicker. It is only in the Ostrich's femur that I have observed su- 

 perficial reticulate impressions similar to those on the fragment in 

 question. The Ostrich's femur is sub-compressed, while the present 

 fragment is cylindrical, approaching in this respect nearer to the 

 femur of the Emeu ; but its diameter is one-third greater than that 

 of the largest Emeu's femur, with which I have compared it. 



" The bones of the extremities of the great Testudo ehphantopus 

 are solid throughout. Those of the Crocodile have no cancellous 

 structure like the present bone. The cancellous structure of the 

 mammiferous long bones is of a much finer and more fibrous charac- 

 ter than in the fossil. 



" Although I speak of the bone under this term, it must be ob- 

 served that it does not present the characters of a true fossil ; it is 

 by no means mineralized : it has probably been on, or in, the ground 

 for some time, but still retains most of its animal matter. It weighs 

 seven ounces twelve drachms, avoirdupois. 



" The discovery of a relic of a large struthious bird in New Zea- 

 land is one of peculiar interest, on account of the remarkable cha- 

 racter of the existing Fauna of that island, which still includes one 

 of the most extraordinary and anomalous genera of the struthious 



