308 ON THE DERMAL ARMOUR OF JACARE AND CAIMAN 
tail, which commences with the thirty-first row. The number of 
scutes in each row is as follows :— 
Rows. Scutes. Rows. Scutes. 
Dat hig Oe we ea ccerenes rataiau nn aeuan 6 Ds 2G cidahamwmagih, aceon 5 
G5 lO 75 850% TOS TT accauess 10 237 RC sere Gia c OB 
TOs TQ saaaisgaadeaawanuid nse sconce 8 20: BOiniinua niranrnariemanaranee 4 
TAS TG <a. ia asnaeashore a atees Aah Be 6 
PO 075 TS) wacseongsncmtaweanntes 4 BT) 32): 338 34: seweswraenvans 5 
TQyisitdestecse . ceiwteiaettmbennes 6 The rest of the tail is 
DOr asain actushun sandateseva ras cietsn 8 wanting. 
D8, DU rinaman onienineuaereaa ques 6 
Throughout the dorso-lumbar and sacral regions (ze. up to the 
nineteenth row), the median scutes are hardly keeled at all, while the 
outer ones are the more strongly carinate the more external they lie. 
In the caudal region, the second scute from the middle line, in 
the twenty-third row, has a strong keel and angulation, which grows 
stronger in the corresponding scutes up to the thirtieth inclusive, until 
the superior and lateral faces of these scutes, in the twenty-ninth and 
thirtieth rows, are inclined to one another at a right angle and very 
strongly keeled. I have said that, as a rule, the median line is occu- 
pied by a suture between two median scutes; but in the caudal 
region,’ in the twenty-fifth row (which corresponds with the sixth 
caudal vertebra) the two median scutes are replaced by one flat scute,. 
so that there is no suture in the middle line. In the twenty-sixth row 
there is a similar arrangement, but the flat scute is smaller; and in. 
the twenty-seventh no trace of it is left, so that the strongly keeled 
lateral scutes meet in the middle line, which is again occupied by a 
suture. This continues up to the thirty-first row, when the median 
scute reappears as a thin vertical plate, broader below and in front,. 
where it articulates with the median lateral scutes, than above and 
behind, where it exhibits a free edge only covered by the horny 
epidermis. It is thus that the serrated dorsal crest of the tail is. 
formed. The scutes of the crest exhibit only very small round 
and distant pits. 
The ventral shield begins in the neck just behind the level of the 
anterior margins of the orbits: the fifteen anterior rows may be 
termed subcervical, as they lie in front of the thorax. In the first six 
rows the scutes are very small, and increase in number up to twelve 
inarow. In the next six rows there are ten scutes in a row, and in 
the last three, twelve. All these rows are symmetrically divided by 
1 The second and third cervical rows in Cadman palpebrosus and trigonatits also contain a 
median scute, and consequently an odd number of scutes. In Catman trégonatius, the third 
to the ninth supra-caudal rows have each a median single scute. 
