256 FreLp CotumB1AN Mus—Eum—Geotoey, Vot. III. 
Similarly on the lateral surface of the gular process the markings 
fall into straight rows in which the pits of adjacent rows alternate 
so as to form diagonal lines. Thus the pits are in regular rosettes — 
patterns of six around one. In other parts of the plastron may be 
occasionally recognized groups of fives, of fours and of threes, but 
for the most part no regular arrangement is to be recognized. 
It is, therefore, probable that if the whole carapace and plas- 
tron of B. vartolosus and B. wmbricatus were known the same regional 
variation would be found to obtain. At all events, little reliance 
can be placed upon the depth or arrangement of pittings as bases 
for specific determination in this genus. 
MEASUREMENTS. 
| M 
Length of carapace at ‘median line. 2: ..... “2.50 705 
Breadth of. carapace...) 2.0.8 ihe sees Reo sh: 
Length of. plastron: sh, pane ne ne ee SE EGES 
Breadth. ofhypoplastra: 20.2 0.'s.. a a eee .480 
Length of bridges a eee .360 
Greatest breadth of nuchal plate..... re 145 
Least breadth of nuchalxshield +...) (he ae .007 
Greatest breadth of first pleural plate ..° 3) GR 112 
Greatest length of third pleural plate’. (70a). 5 205 
Greatest breadth of anterior pygal...70.. 92. > 22 joe 170 
Breadth of entoplastron 4.0) <7.y 2.50 20-72 seen .148 
Thickness of epiplastra at gular eminence’. . 0). . 72 ase .060 
