38 BULLETIN 34, UNITED STATES NATIONAL MUSEUM. 



tbirdj and fourth ei)ibrancbials are present. Between tbe bases of the 

 second and third is a rndimental third ceratobranchial. (Phit.^ 15, 



The carpus in Oryptobranchus is somewhat variable in the typical 

 species. The centrale carpi always separates the intermedium from 

 the uluare, thus reaching the ulna, while the contrale tarsi is always 

 shut off from the fibula by the intermedium. (Plate 45, fig. 3.) There 

 may be two centralia t.irsi ( Plate 4G, fig. 3), as has been shown by Wie- 

 dersheim. There are four carpalia and five tarsalia, but the fourth and 

 (iltli tarsalia may be fused. (Plate 46, flg. 3.) 



The boii;s of the extremities are simple, the femur being without the 

 Loc^hantL'r found in the Pseudosauria, and the humerus being without 

 the condyles. The scapular arch is entirely cartilaginous, excepting 

 the scapula, which is small. There is a large cartilaginous coracoid 

 plate which overlaps that of the opposite side, and is deeply fissured 

 transverse obliquely in front !jom the interior border, cutting off a 

 narrow [irjcoracoid. There is a cartilaginous sternum posterior to tlie 

 coracoids. The pelvic arch has an osseous ilium, which is in contact 

 with an osseous ischium on eacii side, which does not meet its fellow on 

 the middle line below. The pubic region is represented by a large sim- 

 ple cartihige, which is produced into a style on the middle line anteri- 

 orly, as in the Pseudosauria. 



In its visceral anatomy this genus resembles the Pseudosauria. The 

 stomach is distinct, and there is a pyloric flexure. (Plates 6 and 52, 

 fig. 40 



There is one widely-distributed species of this genus, and probably 

 a second, known only as yet from the upper waters of the Tennessee 

 River, but the latter requires further investigation, as I have seen but 

 a single specimen of it. The distinguishing features are the following: 



Posterior digits free; tougue free in frout, its superior surface tlirown into plica?; 



internal nares open C. allegheniensis. 



Posterior digits webbed, tbe external to tbe tip ; tongue not free, covered witb large 



closely-placed pappilla; ; internal uares valvular C.fuscus. 



ORYPTOBRANCHUS ALLEGHENIENSIS Daudin. 



(Plates 5-8.) 



Cnjptohranchus allcghenieusis, Van der Hoeveu, Tijdscber, v. Nat. Gesch. en Pbysiol. 



IV, p. 384, PL v A, f. 3-4, & V. B; Boulenger, Cat. Batr. Grad. Brit. Mus., ed. 



II, 1862, p. 8L 

 SaJamaiidra allcfjliaiiiensis, Daud., Rept., viii, p. 231. 

 Snlamandra gigantea, Barton, On Siren lacerlina. 

 Mohje (jUjaniea, Merr. Tent., p. 187. 

 Criiplobranchus salaviandroides, Leuckart, I. c. 



A'jvauchiis alleijhaiiicnsis, Harbin, I. c. • 



Mcnopoina allerj]ia)nensh, Harlan, I. c; Holbr., N. A. Herp. , v, p. 95, PI. 32; Dekay, 



N. Y.,Faun. Rept., p. S:), PI. 18, f. 44; Diim & Bibr., p. 207, pL 94, f. 1; Wied., 



Nova Acta Lcop. -Carol, xxxii, p. 133, Pl.fi. 



