G. R, Wieland — On Marine Turtles. 127 



Carapace : — 



Greatest length on median line over slight curv- 

 ature, as mounted. . 2 # 00 m 



Greatest absolute length 1-93 



Greatest width over partial curvature, as mounted. 2*18 

 Width over curvature of second pair of ribs 2*10 



Plastron : — 



Absolute length on median line l*87 m 



Width on line drawn across the humeral notches 1*83 

 Greatest width of hyo-hypoplastral fontanelle 



(that at hyo-hypoplastral suture) _. *87 



Distance between numeral and femoral notches 1*15 



Comparative measurements of the right and left femora, tibiae, 

 and fibulae, showing the check on growth due to the loss of 

 the right foot. 



Femora : — 



Eight Left 



Extreme length 43*5 cm 49' cm 



" distal width.. . 200 22*3 



Least antero-posterior thickness of shaft 7*2 »9' 



Tibiae:* — 



Greatest proximal thickness 13*3 15*0 



Fibuloe : — 



Eight Left 

 Greatest proximate thickness 7 '2 cm 8 -3 cm 



Flippers : — 



Distance between glenoid cavities ._ 58* ± cm 



Extreme length of front flipper outstretched 



in a straight line (measure from glenoid 



cavity), _ . - 200* ± 



Extreme length from tip to tip of fully 



outstretched front flippers 458* ± 



Distance between acetabular foramina 28" 



Extreme length of fully outstretched hind 



flipper _ . 1 38- ± 



Extreme length from tip to tip of fully 



outstretched hind flippers 304- ± 



A few comparative measurements of Protostega and Arch- 

 elon, clearly showing the differences in proportion to be 

 expected in different genera, are the following : — 



*The distal ends of right tibia and fibula are cut away by a clean shearing 

 bite : hence the measurements of the left side are the normal ones. 



