| OCR Text |
Show 156 DE. J. DE BEDEIAGA ON THE PYBENEAN 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 ascendentes of the premaxillary. The sectional view of the anterior part of the skull (Plate V I . 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 tbe 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 somewhat 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 (cS) or exceeding ( $ ) 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 vertical 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 tbe 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 somewhat 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 |
