CKOCOUILIANS, LIZARDS, AND KNAKES. 479 



The legs are covered with tubercles much as on the back, but smaller, 

 and iu places more depressed, especially on the under surface of the 

 hind leg and the upper of the forearm. They are still smaller and 

 more distant on the posteiior face of the liumerus. 



The tubercles on the top of the head are larger than those on the 

 back, and compacted, without the intervening small ones, giving some- 

 what of a hexagonal shape. Tliey become larger to the tip of snout 

 and are quite similar on the cheeks. The nostrils are terminal, lateral, 

 large, and semicircular, the chord vertical and anterior, formed by 

 two nearly square plates, one above the other. The rostral is about 

 half as high as long, nearly (juadrangular or depressed pentagonal. 

 On each side of it is one labial of equal height, succeeded by twelve 

 others, the first four or five of which have a second series above them. 

 The mental plate is as wide as the rostral. There are about twelve 

 labials on each side of this. There are four median i)airs of large sub- 

 quadrate plates behind the mental, and four or five smaller, more hex- 

 agonal series between these and the labial. The rest of the under 

 surface of the head is covered with regular elongated ovoidal tubercles, 

 half as large as those on the back, but without intervening smaller 

 ones. 



The ears are vertical or a little oblique, quite large, though not very 

 conspicuous. The eyes are small, the eyelids short, very thick, and 

 covered with tubercles, one series above and two below. Although 

 the entire head is covered with tubercles, there may be traced a series 

 of about six behind and below the eye, with a continuation of four 

 more quadrate ones to the nostril. 



The legs are short and stout, the hinder scarcely, if any, longer than 

 the anterior. The feet are all five-toed, with conspicuous claws. The 

 fore feet are decidedly larger and broader, with consideiably longer 

 claws than the hinder ones. All the digits exhibit inferiorly a series 

 of transverse, imbricated, coarse lamelhc. The fingers are nearly of 

 equal length, the claws of first and fifth reaching as far as bases of 

 those of second, third, and fourth. The toes are more unecpial; the 

 third and fourth about equal, the second claw reaching the base of the 

 third, tlie fifth that of second, the first that of fifth. 



The teeth of Ilcloderina are acrodont, or on the summit of elevations 

 of the bones bearing them. They are long, conical, acute, slightly 

 recurved, and all have a conspicuous furrow on the anterior face from 

 the base to tip, apparently formed by the folding together of a triangular 

 plate. I can detect no evidence of any poison glands. The teeth are 

 few iu number, distant, eight or ten on each side of each jaw, and 

 though long are so much embedded in the fleshy gums as to exhibit 

 only the points. They are confined to the anteiior part of the jaws, and 

 do not come as far back as the jwsterior nares. The palate is deeply 

 but broadly excavated, the pterygoid bones are prominent, and in one 

 specimen bear a single conical tooth. 



