of the Extinct Dromseus ater. 9 



D. ater, S ad. D. ater. 

 Florence. Paris, 



m. m. 



Width of the sternum below (straight line) . . 0-054 0-08G 



Length of the pelvis (mesial line, curve) .... 0-270 0-340 



From the anterior margin of the acetabulum to 



anterior iliacal crest 0-083 



From the posterior margin of the acetabulum 



to the extremity of the ilium 01 27 



From the posterior margin of the acetabulum 



to the extremity of the pubis 0'135 



From the posterior margin of the acetabulum 



to the extremity of the ischium 0130 



Width of the pelvis across the posterior margins 



of the acetabula 0-076 0092 



Width of the pelvis above the acetabula .... O'OGS 0-075 



Length of the femur 0-168 0-180 



tibia 0-300 0-343 



„ „ right fibula (point broken) .... 0-162 



„ „ tarso-metatarsal 240 0-290 



„ „ external digit (toe) 0-067 0080 



„ „ median digit 0-106 0110 



„ „ internal digit (right) , . . . . 0-070 0-070 



Setting aside those measurements which are so apt to vary 

 according to the manner in which they are taken, and which 

 are therefore of little value,, Avhat strikes us at once, on 

 looking through the comparative series, is the fact that the 

 Florence specimen — Avliich is an adult, and I may add an 

 old bird and a male (if what is written on almost every bone 

 is correct, and there is no plausible reason for doubt) — is a 

 notably smaller bird. Let us for examples take a few 

 measurements in which only one method can be used. Thus 

 the Florence D. ater has the femur 0168, tibia 0"300, tarso- 

 metatarsal 0*240, the middle digit of the foot 0"106 in length ; 

 whilst in the Paris specimen the corresponding measurements 

 are: O'lSO, 0-343, 0290, O'llO. The only measurement 

 in which both specimens agree is the length of the internal 

 digit (toe) 0*070. In some instances the measurements, if 

 correct, differ enormously; thus the length of the pelvis along 

 the mesial curve, 0*270 in the Florence specimen, is given as 

 0*340 in the Paris one. 



