'270 



SUPPLEME^vrT TO THE EXTmCT BATRACHIA 



genera, foi- no trace of them can be seen in two specimens and tlieir i-everses of S. 

 digitata and S. longipes, thongh the thoi-acic region is well preserved in both. 



Unfortunately the structure of the cranium in this genus is quite unknown, the 

 part preserved in 8. longii^es being too much injured to furnish characters. The only 

 genus with which it can be compared in the structure of the skeleton remaining, is 

 Tuditayms, and it is possible that some of the species of the latter in which the 

 cranium only is known, should be placed in Scnirojjleura. The type however, T. 

 hrevirostris, has thoracic shields and very weak limbs, so that the genei'a are well 

 distinguished. As to species, the only one of Tuditanus which could, by reason of 

 size, belong to eithei* of those of /Sauroj^leura, is T. mordax ; the T. radiatus and T. 

 obtusus being larger than either S. digitata or 8. longii^es. 



The vertebrae are not elongate and the ribs are quite well developed. In 8. 

 longi^yes the neural spines of the dorsal vertebrae are vertical laminae, subquadrate in 

 outline. The tail is elongate, being proportioned in 8. longijies much as in lizards of 

 typical forms. Of scapular arch I can find nothing, but in 8. longipes the iliac bones 

 are preserved. They are short flat rods slightly narrowing towards the base, which 

 is a transverse expansion, with the distal margin presenting two faces separated by an 

 angle. The limbs are well developed, the ulna and radius separate. In 8 digitata 

 there is no osseous carpus. 



The sizes of the species known are about that of our medium and larger lizards. 

 The 8. digitata is the lai-ger, and of shorter body and more I'obust limbs than the 8. 

 longipes. While the former has thirteen pairs of I'ibs, the latter has nineteen, perhaps 

 twenty-one. 



The dermal abdominal I'ods are airanged en chevron with the angle anterior, and 

 are separated by interspaces. 



SAURO PLEURA. LONGIPES, Cope, Sj). Nov. 



Body long, slender, with long neck and long tail, ribs 19 or 21 pairs, moderately curved, the anterior stouter, 

 and with widened extremities, the posterior slender, and drawn out to a fine point. Dorsal vertebrae 1.5 times long 

 as wide, with well developed neural spines. These are rather narrower than high, the height about equalling the 

 length of the centrum. They are rugose with small tubercles which are sometimes confluent into ridges. 



The humerus is longer than the ulna and radius, which are of equal lengths, that is about as long as four 

 dorsal vertebrie. The ulna aud radius are not widely separated, and expand at the carpal region. The humerus is 

 rather more slender, and is distally expanded. The digits are not all preserved. One metacarpal is seen at an 

 interval beyond the forearm, and series of phalanges extend beyond the metacarpal. The latter is about half as 

 long as the forearm, and a little larger than the first phalange, which is, like the former, very slender. Parts of two 

 or three phalanges of perhaps other digits appear along side, as though turned backwards. The femur is about as 

 long as the humerus, equalling six and three quarter posterior dorsal vertebrae. Proximally it is enlarged gradually 

 and terminates regularly so far as can be seen, as it is partially concealed beneath the distal extremity of the ilium. 



