1899.] NATURAL SCIENCES OF PHILADELPHIA. 323 



active than the latter species and swims rather sluggishly, but with 

 an easy gliding motion. The individuals seen seemed rather shy, 

 and when alarmed quickly took refuge under the large rocks scat- 

 tered through the pool, from beneath which, however, they were 

 easily induced to emerge by the attraction of pieces of meat or 

 worms thrown into the water. 



Measurements in Millimeters. 



Type (^. Type $ . 



Total length 



Tail, from posterior margin of thighs. . 

 Head, from gular fold to end of muzzle 



Snout, from anterior angle of eyes 



Width at anterior angle of ej'es 



Width at posterior angle of jaws 



Width at gular fold 



Depth at lip of snout, approximately.. . 



Depth midway betAveen eyes 



Depth midway between angle of jaws. 



Depth at gular fold 



Eatire length of arm and hand , 



Entire length of leg and foot 



98. 

 45. 

 13.5 

 4.2 



9.5 

 1.8 

 31 

 4.7 

 6. 



12. 



16.6 



108. 



17.5 



14. 

 4.4 

 8.5 



11. 



10.5 

 2.3 

 3.4 

 5. 



13'. 



17. 



117. 



51. 



15. 

 4.5 

 9.5 



11. 



10.5 

 2. 

 3! 5 

 5. 



14! 



18. 



EXPLANATION OF PLATE XIV. 



Figures 1 to 10, Leurognathus marmorata. 

 Fig. 1. The male type, showing the external features from the 



side. The position of the lateral line sensory pores is indicated 



by small circles. Natural size. 

 Figs. 2 and 3. Lateral aod ventral views of the head of the same 



specimen. X 3.2. In fig. 3 the nostrils are slightly too close 



together. 

 Figs. 4, 5 and 6. Lateral, ventral and dorsal views of the skull of 



a slightly larger female specimen. X 3.2. The internal and 



external nares are blackened and the position of the actual 



choante in the entire head is indicated by a ring of dots in fig. 5. 

 Fig. 7. Dorsal aspect of the tongue disk of the same female, 



showing a small area of the closely set papilla?. X 3.2. 

 Figs. 8 and 9. Palmar aspect of the fore and hind feet of the 



example represented in fig. 1. X 3.2. 

 Fig. 10. Section of the skull of the female represented in figs. 



4-6, taken just anterior to the internal nares. X 3.5. p, pre- 



maxillary; f, frontal; m, maxillary; v, vomero -palatine; na, 



nasal passage, which is represented by shading. 

 Fig. 11. A similar section of Desmognathus nigra. X 3.5. n, 



nasal bone ; the remaining lettering as in fig. 10. 



