102 PROCEEDINGS OF THE ACADEMY OF 



sentatives of the bones present in the osseous types (Amblystoma and others) 

 are developed as they are in many other species of this family. The phalanges 

 are 1 — 2 — 2 — 2 — 1 on the feet. The metatarsals are not fully ossified medi- 

 ally. 



From Eastern Mexico. 



Opheobatrachus VERMicuLAHis Gray. 



Annals and Magazine Nat. History, 1868, p. 297. (Edipina uniformk Ke- 

 ferst., Archiv. f. Naturgesch. 1868, 299. 



I had formerly supposed this species to be the same as the preceding, till I 

 read Dr. Keferstein's description, where the specific characters are for the first 

 time pointed out. 



Guatemala, Costa Rica. 



GEOTRITON Gene. 



Bonaparte, Fauna Italica, t. 31, No. 14. 



Tongue attached by the glossohyal pedicel only. Two premaxillary bones, 

 which embrace a fontanelle ; parietals ossified, palatines well developed. Dig- 

 its 4 — 5, united, extensively connected by membrane. 



But one species of this genus is known, which is interesting as being the 

 only species of the Plethodontidse which occurs in Europe. Its characters are 

 quite identical with the ffidipus of the warmer parts of America, except in re- 

 spect to the distinction of the two premaxillary bones, which are consolidated 

 in (Edipus. Until I determined the existence of this character, I regarded the 

 latter name as a synonyme of Geotriton. 



*. Two phalanges, free. 

 Costal plicae ten ; head wide, width less than five times to groin ; parasphe- 

 noid patches widely separated from vomerine teeth ; pale brown above. 



G. fu scu g. 



Geotriton fcscus Gesner. 



Salamandra fusca Gesner. S. tavii Gosse. S. genet Schlegel. Oeotriton genei 

 Tsch. O.fusea Bonap. 



Sardinia. 



(EDIPUS Gray 



Catal. Batr. Sal. Mus. Britt. 1850, 47, num Tschudii, Bonapartii et aliorum? 



Tongue attached only at the glossohyal pedicel ; digits 4 — 5, united by a 

 broad dermal expansion, the phalanges little ossified. Premaxillary bones an- 

 chylosed and embracing a fontanelle. Parietal bones well ossified. 



This genus is remarkably characterized by the structure of its feet, in which 

 the digits, though possessed of the usual number of phalanges, are not ossified 

 until and are not distinguished by the external division of the integuments. This, 

 as is well known, is the condition of the extremities in one of the early stages 

 of digit-bearing vertebrates, and in their number and proportions resemble es- 

 peciallj' fcetal mammalia and Batrachia, at different periods of embryonic and 

 larval life. 



The species are found from Northern Mexico to the mountains of New Gren- 

 ada. 



o. One phalange free. 



Body rather stout, head width a little more than five times in length to groin ; 

 thirteen costal folds ; parasphenoid teeth approximating the vomerines ; black 

 below paler with whitish specks .0. m o r i o' 



AA. No phalanges free. 

 Body elongate, width of head more than six times in length to groin ; costal 

 plicae thirteen ; parasphenoid teeth in contact, and much produced anteriorly; 



[May 



