632 ZOOLOGY REPTILES AND BATRACHIANS OF ARIZONA. 



Ambystoma proncrpinc^ HALLOW., Jour. Acad. Nat. Sci. Phila., iii, 1858, 354. 

 Ambt/fitoma maculatum, HALLOW., Jour. Acad. Nat. Sci. Phila., iii, 1S58, 355. Id., 



Proc. Acad. Nat, Sci. Phila., 1857, 215. 



Desmiostoma maculatum, SAGER, Peiiius. Jour. Med., 1858, 428. 

 Camarataxis metadata, COPE, Proc. Acad. Nat. Sci. Phila., 1859, 123. 

 Ambystoma nebulosum, HALLOW., Proc. Acad. Nat. Sci. Phila., 1852, 209. Id., Jour. 



Acad. Nat. Sci. Phila., iii, 1858, 352. Id., Sitgreave's Exp. Zufii & Col. Riv., 



1853, 143, pi. 20. 

 AnMystomaf ncbulosum, COPE, Proc. Acad. Nat. Sci. Phila,, 18GG. 300. 



b. CALIFORN1ENSE. 



Ambyostoma californiense, GRAY, Proc. Zool. Soc. Lond., 1853, 11, pi. 7 (Monterey). 

 HALLOW., Jour. Acad. Nat. Sci. Phila,, iii, 1858, 355. 



In the Siredon stage differing from the S. gracilis, Baird, in its oblique 

 branchial arches, with finer pectinations, and in coloration. On the anterior 

 side of the third arch, twenty pectinations, or rakers, may be counted; in the S. 

 pisciformis (or mexicanus) there are but twelve. . . . Male about seven inches 

 long. Branchiae well developed. Gular derm free half way to symphysis 

 mandibuli. Twelve costal folds. Muzzle slightly narrowed ; jaws equal. 

 Lateral and dorsal pertonseum black. The lungs extend to opposite the 

 inguinal region. Corpus adiposum extending on testes to their anterior 

 extremity. Testes undivided, broad ; length equal to half that from axilla to 

 anus ; efferent vessels numerous, not entering directly the vas uro-sperma- 

 ticus. The latter is very slender, lying along the outer margin, but not in 

 contact with the narrow kidney ; opposite the latter recurrently convolute, 

 anterior to it straight, and extending to opposite axilla with decreasing 

 diameter. It empties into the rectum near the cloaca. Cloaca protected on 

 each side by a large, vertical, compressed gland, which is fringed on its 

 inferior border (which is received into the lip of the cloaca), and also on its 

 superior margin, which lies next the caudal vertebras ; it is continuous in 

 front of anus ; behind the two edges are pressed together. Integument of 

 cloaca thrown into numerous appressed vertical plicae, as in other Siredons. 

 Stomach straight, extending to the left groin, filled with larvae of Diptcra 

 Nematocera. Intestines long; rectum large. Female smaller; many of the 

 ova black. 



In these animals, the tarsal and carpal bones are fully formed, but 

 cartilaginous. The palatine and pterygoid teeth in continuous series ; the 



