316 Annals of the Carnegie Museum. 



25. Prionodactylus eigenmanni sp. nov. (Plate XXXV.) 

 Snout as long as the distance from the posterior angle of the lids to 

 the anterior margin of the ear-opening. Rostral thrice as broad as 

 deep, concave behind; frontonasal single, broader than long, the 

 anterior margin as long as the shield, posterior angle very obtuse, 

 pentagonal; nostril pierced in a single nasal, slightly in front of and 

 above the center; a large loreal, its posterior extremity pointed; a 

 triangular pre-ocular; two large prefrontals, meeting in a suture which 

 is more than half as long as the shields, narrowly in contact with the 

 anterior supra-ocular, as broad as long; frontal shorter than its distance 

 from the rostral, shorter than the interparietal, once and two thirds 

 as broad in front as behind, sides concave, anterior margin obtusely 

 pointed; frontoparietals longer than the prefrontals; interparietal 

 large, heptagonal, once and a half as long as broad, projecting between 

 the lateral occipitals, much longer than the parietals; three occipitals, 

 the median about a fourth as large as the laterals and projecting 

 slightly back of them; two large postoccipitals; three supra -oculars, the 

 first much the largest and in contact with nearly the entire lateral 

 margin of the frontal, the second narrowly in contact with the posterior 

 part of the frontal; a large anterior supraciliary in contact with the 

 loreal and prefrontal; temples covered with large shields, below which 

 are three rows of small cheek-scales; six upper labials, the fourth and 

 sixth the largest, the fifth smallest, the posterior end of the fourth 

 below the hinder margin of the eye; seven lower labials, the third 

 largest; a single anterior chin-shield, followed by four pairs, the third 

 pair separated by a pair of small scales, the fourth by a pair of large 

 scales, which latter are prevented from touching mesially by a row of 

 small scales; two longitudinal rows of large, transverse, gular shields, 

 seven in each row, the anterior pair separated by smaller scales; collar 

 fold poorly developed, eight collar-shields, the two central ones large, 

 the lateral shields smaller than the gulars, the few scales under the 

 sides of the fold imbricate and good sized, not small and granular. 



Dorsal scales large, rounded or bluntly pointed behind, strongly 

 keeled, once and a half as long as broad, or a little longer; thirty-one 

 scales between the postoccipitals and the sacrum; scales of the sides 

 of the body smaller than those of the back, but not granular, except 

 over the bases of the limbs; six rows of large ventral shields, those of 

 the outer row being about half as large as the shields of the four inner 

 rows, in eighteen transverse series. A double row of large smooth 



