164 REPORT—1874. 
mon is such that it is not clear whether these dspressions represent natural cavities 
or fractures. 
Orbits. Slightly posterior, large, irregular; interorbital space equal to transverse 
diameter of orbit. Teeth (disposition). Premaxillary, two or more teeth on each 
side, larger than the maxillary; maxillary about 16-18 on each side, small, uni- 
form; palato-vomerine tusks in series with small teeth. Teeth (structure). Conical, 
strong, nearly straight; apex smooth and obtuse, base with about 20 simple, regular 
grooves. Cranial sculpture. Tuberculate, radiate ? 
Measurements (from Eichwald’s Memoir and figures). 
in. 
Total length of skull 2.0... .c ees eee senensaentenseen (about) 7 
Length of skull along middle line «0.6.6... cece eee rete ee eens 6 
Greatest breadth of skull... ... ccc cece sec e creer ewes er enenens Ey) 
Breadth at middle of orbits..........secececeeeeeseseeeseeees 4°75 
From centre of occiput to posterior end of orbit ........+.se sees 2 
From tip of snout to anterior end of orbit..... 16. cesses eee eee . 3125 
Length of orbit... 1. sc ce cece eee e nee eect eee entree een ne enes 15 
SOV lt reer eeaneb ati etcte te voici nes hss actedol Vans: Rake Siosarecdis to wi shew lavens (about) 1 
Least width of interorbital space ........eee eee eee tenet eeeees 1:12 
Z. Lucius, Hichwald. 
Locality. Zechstein of the Government of Perm, Russia*. 
References. Eichwald, Bulletin de 1a Société des Naturalistes de Moscou, tom. xxi. 
p. 159, tt. ii., iii., iv. [1848].—Pictet, Paléontologie, vol. i. p. 550 [1853 ].— 
Eichwald, Lethza Rossica, vol. i. pl. ii. p. 1630 [1860-61]. 
Melosaurus, Von Meyer. 
Eurosaurus, Lichwald. 
Skull (figure). Triangular, with concave sides, obtuse snout, and concave occipital 
border. Orbits. Moderate, oval, posterior, interorbital space equal to transverse 
diameter of orbit. External nasal foramina. Rather small, further back and more 
central than usual. Parietal foramen with raised edges. Teeth. Mandibular 
about 30 on each side, small behind, irregular in front, small teeth in series with 
very large ones; conical, slightly recurved, pointed, striate at the base. Mandi- 
bular articulation. Postarticular process wanting. Cranial sculpture. Radiately 
itted. Vertebre, &c. The vertebrae and limb-bones attributed to this genus by 
ichwald are not proved to belong to it; and some of them differ much from the 
same parts of undoubted Labyrinthodont skeletons. 
Measurements (from Eichwald’s figure). 
Motalelang ili otesktll lw gates ieasles eisisicka’ss/: aici +», ©'s age’ Sete mRE 7°75 
Greatest preadhisot Sk casi itekalis l)atacleis sere ip\n\a >, vicielle'© aieleleleiey 5:25 
From centre of occiput to posterior end of orbit ........++..00% 2°25 
From tip of snout to anterior end of orbit...........6....e00s ae 3) 
Tig OP OTUs os cess ainisis x islreiapastnkG o.9 6+ oes as aeialy yi Seles 
THAR Gi 0h OL Bae SnWae daly yaa CORO con SSS OO aSORE OMT Or SJ. 75 
Least width of interorbital space .....01..+cecs5 coscwsenencs 75 
Length of postarticular process of mandible...............++065 2°5 
Greatest length of mandibular tusks .......... 6. ec eeeee seers 1 
M. URALENSIS, Von Meyer. 
Locality. Calcareous marl (Permian) of Orenburg. (The single example is now 
at Berlin.) 
References. Von Meyer, Jahrbuch fiir Mineralogie, p. 298 [1859].—Jd. Palzon- 
tographica, vol. vii. p. 90, t. x. [1859].—Eichwald, Lethza Rossica, vol. i. 
pt. 2, p. 1621, t. lvii. fig. 25 [1860]. 
* Hichwald has identified the Chelonia radiata of Fischer with Zygosaurus; it appears 
much more like a fossil fish. 
