156 DE. J. DE BEDEIAGA ON THE PYEENBAIf NEWT. [Feb. 19, 



apart. Its posterior portion is grafted on the substance of the 

 lamina cribrosa, anteriorly it meets the short inner vertical portion 

 of the processus ascendeutes of the premaxillary. The sectional 

 view of the anterior part of the skull (Plate VI. fig. 5) and the 

 upper view of the partly dissected skull (fig. 6) show the curious 

 structure of the nasal cavity of M. aspera. I append two other 

 views — fig. 4 and fig. 7 — of the skull of M. rusconii, for the 

 purpose of exhibiting the difference in the structure of the nasal 

 cavity. M. rusconii possesses a strong double and ossified septum 

 nasi.] 



Larva. (Plate V. figs. 4 & 6.) 



The head is rather large, longer than broad, and more or less 

 distinct from the neck ; the upper surface is flat. The snout is 

 slightly depressed and rounded ; it is always longer, narrower, and 

 lower in females than in males. Nostrils very near the border of 

 the snout; the distance between the nostril and the lip some- 

 what less than one-fifth of the distance between the nostril and 

 the eye ; the internarial space is a little broader than the interpal- 

 pebral breadth. Eye moderate, oval, lateral, moderately prominent ; 

 its distance from the nostril equalling ( c? ) or exceeding (2) the 

 interpalpebral width, and its distance from the lip is considerably 

 greater than the vertical diameter of the eye. The longitudinal 

 diameter of the eye is shorter than its distance from the nostril 

 and also shorter than the internarial width, the breadth of the 

 upper eyelid slightly exceeding the half of the interorbital space. 

 The pupil is round. The cleft of the mouth extends to the ver- 

 tical of the posterior angles of the eyes. Labial lobes moderately 

 developed. The space between the longest gills is considerably 

 longer than the upper part of the arm. 



Body robust, rather short, and nearly round in males ; more 

 slender, moderately elongate, with flattened lower surface, in 

 females. The distance between fore and hind limb is at least 

 twice as great as the width of the head. Caudal crest extending 

 but very slightly upon the back ; it occupies hardly one-third the 

 length of the body. Longitudinal groove along the sides very 

 indistinct ; eleven or thirteen costal grooves between axilla and 

 groin, ten transverse grooves upon the belly. Anal region in 

 young specimens hardly swollen. The limbs, especially the hind 

 ones, are short and thick in the male, a little thinner in the female ; 

 the fore limb when stretched forwards reaching the anterior corner 

 of the eye in the male, or slightly beyond in the female ; the hind 

 limb being carried forwards equals the half of the length of the 

 distance between fore and hind limbs. Fingers and toes short, 

 rather thick, ending in a point ; the third finger longer than the 

 second, which is longer than the fourth and first ; the first is some- 

 what shorter than the fourth ; the middle toe is the longest, the 

 fourth toe is longer than the second, which is in its turn much 

 longer than the first and fifth ; the latter is a little longer than the 

 first. The tips are blackish brown. Tail measuring about the 



