ON THE CLASSIFICATION OF THE LABYRINTHODONTS. 161 
Breadth at middle of orbits, restored... 1.1... 2. cece cece ee eee 1:25 
From centre of occiput to posterior end of orbit .............0.. 68 
From tip of snout to anterior end of orbit .............. (about) +55 
UL ORL: te RAGA ae eee ee ied ae ‘75 
PUTO OL OU ISS > oe op pee oa 2 hadi ala anaaidell 26 «hte: 3) 
Least width of interorbital space ..... cece ee cece eee eeveeeees 75 
M. Srown, Huxley. 
Locality. Triassic rocks at the foot of the Rhenosterberg, a branch of the 
Sneewbergen Range, S. Africa. 
References. Huxley, Quart. Journ. Geol. Soc. vol. xv. p. 642, pl. xxi. [1859]. 
Rhinosaurus, Waldheim. 
_ Skull (figure). Triangular, rounded in front, sides somewhat convex ; auditory 
openings conspicuous, wide and deep ; epiotic cornua short, broad ; postero-lateral 
expansions large, overlapping much of the posterior part of the mandible. Orbits. 
Large (length about one fourth the length of the skull along the middle line), central, 
roundish, irregular, distant. External nasal foramina. Large, round, approximated, 
close to the tip of the snout. Parietal foramen. Large, situate in the fore part of 
the interparietal suture, much nearer to a line joining the posterior ends of the 
orbits than to the occipital border. Zeeth. Maxillary and mandibular apparently 
nearly regular, smaller behind, slender, slightly compressed, conical, pointed, 
curved. Cranial sculpture. Pitted radiately ; no mucous grooves visible. 
*,* The single skull of Rhinosaurus shows a round foramen (situate apparently 
in the fore part of the quadrato-jugal). This may be accidental, or it may represent 
what Prof. Huxley has called the “ supratemporal foramen” in Anthracosaurus. 
Measurements (from Fischer de Waldheim’s Memoir). 
(French) in. lines. 
3.5 
rerimesnetneot Siti lews n shins sterea sistas Satie ae aie neta eae 
Length of skull along middle line...............e cece eee eee 2 11 
Pcaresiorendub Of ekOller.. voce vest cs ttre eect ote keene 2 4 
came aL TG LO OUOLDIbs, or ad e's a ce ciccina ten ee tok aaiere 1s 
Lost OaL OT OGL thd ein pike SiRiin rea Cin ito ee Glemeiok (about) 0 9 
Least width of interorbital space ........... ines Cosgdedn ode 0 10 
Distance between external nasal foramina ..............-005 0 4 
Ceeutese COU GL MINOT Gee esse eee s ett sens pecenens Ore 
R. Jasrxovu, Waldheim. 
Locality. Oolite of Simbirsk, Russia. 
References. Fischer de Waldheim, ‘‘ Notice sur quelques Sauriens de 1’Oolithe 
du Gouvernement de Simbirsk,” Bull. Soc. Naturalistes de Moscou, tom. xx. 
pt. 1, p. 364, t. v. [1847]. 
Bothriceps, Huxley. 
Skull (figure). Parabolic. Orbits. Large, oval, central, converging forwards; 
interorbital space greater than transverse diameter of orbit. Nasal foramina. 
Large, roundish, separated by about half the interorbital space. Teeth. “ Very 
numerous and close-set, not more than one eighth of an inch long; they are 
conical, straight, and sharp-pointed, and their bases are expanded and marked by 
about twelve longgitndsind olds, which extend to near the apex of the tooth.” 
Cranial sculpture. Pitted closely and irregularly. 
Measurements (from Prof. Huxley’s Memoir and figures). 
in. 
Length of skull along middle line .................ee esse eee 1:3 
Greatest breadth of atl - 57 OE ere oe aoleeeny Get ae (about) 1:5 
Breadth at middle of orbits ....... op enals tegen ence nas « (about) 1:75 
M 
