1878.] 509 {Cope. 
symphysis not sutural, but ligamentous. Terminal mandibular tooth not 
small. Teeth not faceted, simple. 
This genus, which I suppose to be reptilian, is represented by a speci- 
men which lacks the posterior portion of the skull ; hence its near affinities 
cannot be determined. In the character of the cranial sculpture it re- 
sembles crocodiles, and the Labyrinthodont genera cotemporary with it, 
and differs from Lacertilia with cranial sculpture known to me. 
Char. Specif. Parietal and frontal regions flat, the latter joined to the 
maxillary by a rectangular canthus. Interorbital region wide, equal to 
the diameter of the orbit. Sculpture of vertex in longitudinal series of 
pits of considerable irregularity. There are ten or twelve such rows be- 
tween the orbits. The crowns of the teeth are obtuse, and their surface 
smooth. 
Measurements. M. 
Imniterorbita wa diihvor Skull fers ant, shel lotsieue >. lice = <0 e009 
Width between prefrontal borders.................... .014 
Depth or facial platevot maxillary... 20s. cic cer cmesies 007 
i NAMUSHMAN CWA OLD clj\eriieecteiieaasas 0G 
ss se se MERIC ls Bb Seb ou meroseees ells 
Length. of short maxillary tooth: . 2.0002. 66.cceweee sees .0015 
: oe long 48 Siemn -reveNeLoh ue isienvat-te aire deitcate OURO 
Width 4 ay Se Nca sya) fest Nala leacehe eke CED 
The skull of this species is about as large as that of the Heloderma sus- 
pectum. 
CLEPSYDROPS NATALIS. Sp. nov. 
This reptile is represented by numerous portions of the skeleton, includ- 
ing a cranium, and thus offers the best basis of information as to the char- 
acter of the genus Clepsydrops which has yet come into our hands. This 
furnishes numerous interesting characters, which as found in a single in- 
dividual furnish a basis of estimation for the entire group. 
Char. Gen., et cetera. There is no quadratojugal arch, but the zygo- 
matic and postorbital arches are present. The squamosal extremity of the 
zygomatic arch descends low on the quadrate as in turtles, preventing 
mobility of the latter. The quadrate is not prominent in the specimen, 
and appears to have been a thin bone, as in Hetocynodon. The nostril is 
large and latero-anterior. The symphysis of the mandible is short, and 
the premaxillary bones appear to be distinct; they are separated in the 
specimen by displacement, with the indication that the junction was 
sutural. The teeth were of different sizes, and the premaxillaries and 
canines are distinguished from the others by their proportions. All are 
sub-round in section, with more or less defined anterior and posterior cut- 
ting edges. The premaxillary teeth are larger anteriorly, diminish pos- 
teriorly, and are separated by a notched diastema from the large canine. 
The succeeding teeth are of medium proportions. The roots are sunk in 
deep alveoli. There is no surface sculpture of the cranial bones, which is 
the character distinguishing the genus Hetocynodon from Clepsydrops. 
