2° 8 L. V. MÉHELŸ 
Outer metatarsals united. Maxillaries separated by the praemaxillaries.* 
Precoracoids ossified, in the middle united with a rhomboidal cartilagi¬ 
nous plate (pl. XIII, fig. i) ; no omosternum ; sternum an anchor-shaped 
cartilaginous plate. Diapophyses of sacral vertebra strongly dilated. The 
end of terminal phalanges on its lower surface with a shovel-shaped di¬ 
latation (pl. XIII, fig. 2). 
Differing from Stereocyclops Cope by the erect pupil, the absence 
of the ossified annulus round the cornea and the less dilated sternum ; 
from Hypopachus Keferst. by the absence of the dermal ridge between 
the choanae, the entirely free fingers and toes, the strong precoracoids** 
and the much dilated diapophyses of sacral vertebra. 
1. Dermatonotus Mülleri Bttgr. 
(Pl. XIII, fig. i—3.) 
Engystoma Mülleri Boettger, Zeitschr. f. Naturw., LVIII, 1885, p. 241 ; 
Boulenger, Ann. & Mag. Nat. Hist., (6) XIII, 1894, p. 847. 
Hypopachus Mülleri Peracca, Boll. Mus. Torino, X, 1895, p. 23. 
Habit stout. Snout short, subacuminate, moderately prominent, 
once and a half the diameter of the eye. Nostril close to the tip of the 
snout, its distance from the anterior corner of the orbit equal the two 
thirds diameter of the latter. Eye rather small, little prominent. Frenai 
region deeply sunk. Interorbital space twice to twice and a half broad 
than the upper eyelid. Fore limb longer than its distance from the tip 
of the snout. Fingers moderately elongate ; first much shorter than second, 
the latter nearly equal with the fourth. Hind limb stout ; the tibio-tarsal 
articulation does not reach the shoulder. Toes without web, the tips 
blunt ; subarticular tubercles distinct ; inner metatarsal tubercle oval, very 
prominent, the outer absent. Fifth toe shorter than third. Skin smooth, 
on the back strongly thickened, leatherlike, porous. A strong fold across 
the head, behind the eyes, continued on the sides down to the axilla. 
Coloration. Olive-grey above, on the adult immaculate, on the young 
with dark vermiculations ; sides, hinder side of thighs, fore and hind limbs 
* Belongs to my group Eleutherognathinae (Természetrajzi Füzetek, XXIV, 
1901, p. 237). 
** Already for this reason it is not possible to unite this genus with Hypo¬ 
pachus , for, as Mr. Boulenger writes «precoracoids are very weak» (Cat. Batr. Sal., 
1882, p. 150) and Dr. Günther also remarks «Differing from Engystoma by the 
presence of very small precoracoids» (Biologia Centrali-Americana, 1902, p. 211). 
