160 NOTES FROM THE AUSTRALIAN MUSEUM. 



enveloped in skin, webbed, the 3rd the longest, webs extending 

 beyond the tips. Hind legs (pi. VI., fig 2) without any shields, 

 nails of 1st and 2nd toes free, 3rd toe longest, 3rd, 4th, 5th within 

 the web, flattened without nails. Tail with from 14 to 16 narrow 

 curved plates on the upper surface, skin wrinkled. 



The 2nd to 6th marginal plates narrow, the 7th much wider 

 behind than in front, 8th almost square, the remainder gradually 

 increasing in width to the 10th, which has its outer border one- 

 fourth greater than its upper, which joins the last two costal plates. 



All the marginals from the 6th are slightly curved upwards and 

 outwards to their outer margin, the central is keeled on its 

 anterior half where it forms the last part of the dorsal lidge, 

 adjoining the pygal, but is rounded posteriorly, bevelled off at 

 its hinder margin like the rest. All the marginals from the 6th 

 are very compressed and thinned off, forming a cutting outer edge. 



The plastron or ventral shield is flat, of 9 plates, between the 

 1st and 2nd pairs the interclavicle a 4-sided plate is wedged in, 

 having the two anterior or apical sides nearly twice as long as the 

 posterior and formiug an acute angle between the first pair of 

 clavicles ; 2nd, 3rd, and 4th pairs of plates with a straight median 

 suture (see pi. Ill) ; the 2nd and 3rd pairs anchylosed to the 

 4th and 7th marginals. The whole of the plates of the carapace 

 and sternum are covered with small round raised rugations or wavy 

 irregular raised lines between shallow sculptures, towards the 

 lower borders on the sides, these take an elongated form some- 

 times parallel to the sutures. 



Hind portion of the head, the neck, and the legs covered with a 

 smooth skin ; head with 5 to 7 plates, anterior and median 

 pairs anchylosed. Nostrils anterior, widely grooved in front, coronal 

 plates bent down behind the eyes, mandibles with a sharp cutting 

 horny edge, the symphysis of the upper jaw rounded in front and 

 notched at the sides. Palate grooved on either side (where not 

 cut away), the occipital shields are large and broad and rugose 

 like those on the back. Head large and wide, throat swollen, 

 skin bare round the eye, no preorbital ridges. 



Measurements: — Total length of carapace 18 inches; along the 

 curve of the back 19 inches ; breadth through widest part 



