1 6 PERENNIBRANCHIATA. 



groove below, much nearer angle mandible than sym- 

 physis; muzzle long, frontals narrow plane; canthus not 



strong « ANGUINUS. 



Zoisii is the stoutest in proportion to its length. P. 

 carrarae is from Dalmatia, while the others are from Car- 

 inthia. A specimen like P. xanthostichus, but with nine 

 praemaxillary teeth has been named J^reyeri, and one 

 very near anguinus with twenty-four mandibulars, has 

 been named Haidingerii" 



Cope is not alone in holding the view that there are 

 more than one species of Proteus. Freyer*in 1846 claim- 

 ed two, and Fitzingerf in 1857 described the following 

 seven : 



Hypochthon zoisii, 



Schreibersii, 



Freyeri, 



Laurentii, 



Haidingeri, 



carrarae, 



xanthostichus. 

 The characters however used in distinguishing these 

 are not considered valid, and in the present state of 

 knowledge we seem scarcely justified in subdividing the 

 genus, but rather ought to consider these as varieties of 

 one and the same species. We have then 



* Archives fur Katurgeschichte. 

 f Sitzungsberichte Wien. Acad. 



