FROM THE ZEBBUG CAVE, MALTA. 121 
longing to C. falconeri; for the thigh-bones were the exact counterpart of those which 
had come earlier under my notice. 
I annex a Table of measurements of the bones of C. falconeri, as compared with 
those of the large female C. olor :— 
: a C. olor. C. falconeri. 
Middle thoracic rib— inches. lines, inches. lines. 
a. Acrosstheneck . . .. O 5 j 
b. Width of outeredge. . . 0 pate: > ish nek 4 
Ulna— 
Diameter of shaft. . . . . 0 Ope walt tomy FO if 
Radius— 
Diameter of shaft. . . . . 0O Sharer asst 60 4 
Femur— 
Across head and trochanter . 1 1 1 5 
Width of middle of shaft . . 0 54 0 8 
Width across lower condyles . 1 0 1 5} 
Tibia— 
Fore-and-aft width of head if 5 1 9 
Thickness of head 0 gL 1 2 
Width of shaft . 0 4 0 8 
Width across lower condyles Ojpestt: 1 4h 
Tarso-metatarse— 
Extreme length 4 3 5 3 
Width across head 1 0 1 24 
Width across shaft 0 5 0 6 
Width across condyles 1 0 1 t 
Phalanx (proximal, middle)— 
Wtensthis soe) ve aes sotroly eet? * 52 24 1 14 
Thickness of proximalend. . 0 52s! Fora os 
Thickness of shaft . ... 0O Open ae nt, 1) 4} 
Mr. Erxleben’s figures show very faithfully the perfect agreement, in everything but 
size, between the great extinct Swan and Cynus olor. The largest bones of C. falconeri 
are not, however, displayed in the Plate, for this reason, that the most perfect bones 
for figuring were apparently those of females; but there are bones still larger in the col- 
lection, most likely those of male birds. 
s2 
