Cope.] 506 [April 5, 
id 
ropelicus, the following characteristic marks appear: The tooth-line di- 
verges much more strongly inwards from the maxillary border in the D. 
lutibuccatus, leaving a wide groove between the two. This groove is 
separated by a narrow horizontal partition from a corresponding one of the 
superior face of the same element, and its surface is longitudinally rough- 
ened. The teeth are closely placed, and the series turns with the anterior 
extremity of the jaw, abruptly inwards. The transverse diameter of the 
teeth lessens to just posterior to the point of curvature, so that their section 
is nearly round ; at and anterior to the curve, the wide transverse diameter 
is resumed, the last alveolus preserved making an angle of 45° with those 
in the posterior part of the jaw. The external surface of the maxillary 
hone is roughened, as is also the case in the D. sideropelicus, with coarser 
and finer irregular impressions, fosse and grooves. 
Measurements. M. 
Width of jaw at ninth tooth from curve.......... Seoene olait 
Width of ninth tooth from curve..... Bina aa ei ehe mie era eee ULL 
Bs GG iroyburtloies GC G6 Ee Moet et 5 Mea see ah APN ater Bos teh NOLS 
WG HS LOOUMFAT I CUIVIC ts 6 aiecencciatcrendersier arith am era eee OS 
SS thirdtooth anterior torcumvese ces ase nee .010 
Sey | ES JAW, ab, ICUNVE)tax, ceovoks octane oretenie ticleroe era eit Oe 
Elevationot alveolar part.Of jaws. fn... t cee ee oe ee ee .018 
Mhmeevtee thine ae. ee oe SH kare aiatoveuspee(hey Motor sen ta ene ere .015 
There are other fragments of jaws referable to Diadectes whose specific 
reference is uncertain. 
BOLOSAURUS STRIATUS. Gen. et. sp. nov. 
Char. Gen. Teeth fixed in shallow alveoli, and with the crowns ex- 
panded transversely to the axis of the jaws. The crowns swollen at the 
base, and with low apex, divided vertically into two equal portions. The 
postero-internal half in the maxillary series is low and horizontal; the 
antero-external portion forms a curved cusp, which has a semicircular sec- 
tion. The teeth of the lower jaw are similar, but the relative positions of 
the ledge and cusp are reversed. Anterior teeth of superior series com- 
posed of external cusp and internal ledge. No enlarged canine or incisor 
teeth. Bones of face not sculptured. 
This genus is represented by a good many remains, which include some 
partially complete crania. These show that there is no quadratojugal arch, 
and that the quadrate is of the flat character of that of the Anomodontia, 
and was probably immovable. The orbit is complete behind, and there is 
a strong squamosal arch. The vertebre are amphicoelous, and probably 
notochordal. The neural arches are freely articulated with the centrum, 
and the zygapophyses and neural spine are well developed. 
The vertebre resemble those of Lysorophus* (Cope) from the Tlinois 
Permian, but they do not display the deep longitudinal fosse of that 
genus, 
* Proceed. Amer, Philos. Soe. 1877, p. 187. 
