201 BULLETIN 34, UNITED STATES NATIONAL MUSEtfM. 



DIEMYCTYLUS TOROSUS EscL. 



(Plates 36, fig. 2; 38, tigs. 1-4 ; 45, fig. 8 ; 49, fig. 3.) 



Cope, Check-List Batr., Kept. N. Amer., Bnll. U. S. Nat. Mus., i, p. 

 28, 1875. 

 Trilon lorosus Esch., Zool. Atlas, p. 12, PI. 21, fig. 15 ; Straucb, Salam., p. 30. 

 Salammdra heecheyi Gray, in Grifl". A. K., i., p. 107, aud Zool. Beecbey's Voy., PI. 31, 



fig. 3. 

 Triton ermani Wiegm., in Erman's Reise um die Erde, p. 24. 

 SaJamandra (^Triton) granulosa Skiltou, Amer. Jouru. (2), vii, p. 202. 

 Nolopthalmus torosus Baird, Journ. Ac. Phila. (2), i, p. 284. 



Tarivha torosa Gray, Cat., p. 25 ; Girard, U. S. Expl. Exped., Herp., p. 5, PL 1, fi. 1-8. 

 Taricha Jwvis Baird & Girard, Proc. Ac. Phila., 1853, p. 302. 

 Trilon Imvis Strauch, I. c. 

 MoUje torosa Boulenger, Cat. Batr. Grad. Brit. Mus., second ed., 1882, p. 20. 



This fine species is of rather robust proportions. The head is wide 

 and distinct from the ueclv, through the protuberance of a posterior 

 superior angle on each side. It is also i)erfectly flat and smooth above, 

 excepting a gentle slope from a line connecting the orbits to the end 

 of the muzzle. The body is slightly compressed, and its length from 

 axilla to groin is just equal to the length from the axilla to the end of 

 the muzzle. The tail is long, exceeding the length of the head aud 

 body by the depth of the latter. It is very much compressed, and has 

 a wide dermal border both on the inferior and the superior edges. 



Viewed from above, the head is contracted towards the muzzle with 

 curved lateral outlines, and the end of the muzzle is truncate. It also 

 projects considerably beyond the lower jaw. The nostrils appear to be 

 teriniiuxl, but directed laterally, and the space betweeu them equals 

 two thirds that between the bases of the eyelids, and exceeds by one- 

 quarter the space betweeu the internal nares. It also equals the length 

 from the eye to the nostril, and exceeds by a very little the length of 

 the eye-fissure. 



The upper lip begins to descend posteriorly at a point half-way be- 

 tween the nostril and the eye, and does not rise again, but conceals the 

 lower jaw. The rictns is just behind the posterior angle of the eye. 

 Anterior to this point it is joined on its internal side by a short lamina, 

 which represents the lower lip of the perenuibranchiate species of 

 Batrachia. This lip is entirely concealed, and there is no fold in front 

 of it, on the lower jaw. 



The tongue is oval, aud very small. It is only free at the sides, and 

 that but slightly. The vomeropalatine teeth are in two straigbt series, 

 which converge forwards aud join directly between the choante. 



The limbs are robust, the posterior ones the more so. Applied to the 

 side, they overlap by the length of the posterior foot with tarsus. The 

 digits diflVr much from each other in length, but not so much so as in 

 the D. viridesccns. The second (first) finger is very short, and the fifth 

 is a little longer, while the third and fourth are of usual length, the 

 third the shorter. '1 he phalanges are l-2-3-'_'. The toes are arranged 

 much as the fingers, the longer ones of medium length, and the first 



