TERTIAliY VERTEBllATA OF THE FAYtM. 
the ])lastron in the groove between tlie humeral (n.) and pectoral (j).) shields. In some 
s])ecimens the up[)er surface of the cpiplastrals is raised into a sort of boss near their 
])osterior angle, and from this a slight ridge is continued backwards to the axillary 
buttress. The suture between the hyo- [llij.p.) and hypoplastrals {Iltjp.p.) crosses 
tlu' middle of the bridge and terminates at the inner angles of the small meso- 
plastrals [Ms.p.), which are irregularly hexagonal in outline and are wedged in between 
the outer ends of the hyo- and hypoplastrals and the marginals. The sutures 
between the hypo[)lastrals and xiphiplastrals {Xi.p.) make an angle of about 115° 
with the middle line, and are slightly convex forwards. The posterior border of the 
plastron seems to have been notched in the middle line as in 8. Uhijca, but in no 
specimen is this region Avell preserved. 
The arrangement of the horny scutes on the plastron is only known in the case of 
the anterior region. The intergular (/y.) is very large, its posterior ])oint being about 
on the middle of the entoplastron. Both the gulais (y.) and humerals (w.) are very 
small and widely separated by the intergular. In Stercoge7iys podocnemioides, lleiuach, 
the humerals are much larger and their posterior angles coincide with that of the 
intergular: this condition is transitional to Fodocnemis, in which both the gulars and 
humerals meet in median suture behind the intergular. 
C. 10027. Skull and niandihle, found actually articulated with each other. The skull is somewhat 
crushed and is imperfect in the premaxillary i-egion. Many of the sutures are obscured 
by a coating of gypsum. Type specimen described and figured in Cleol. I\Iag. [1] 
vol. viii. (1001) pp. 442-.3, fig. 4 ; also on PI. XXV. tigs. 2, 3. The dimensions (in 
centimetres) of this specimen arc : — 
Skull : 
Extreme length in middle line 
„ „ from end of the squamosals . 
n-G 
10 a 
Greatest width (at tympanic opening) 
Width between the ends of the ectopterygoid processes 
„ outer ends of quadrate articulations . 
of quadrate articuladon 
Pistance from internal nares to tip of nose 
Width of palate 
4 
Mandible : 
Total length 
Length of symphysis 
W'idth at coronoitl process 
articular surfaces for quadrate 
E. 3007. Plaster casts of the above s[)ecimens. 
^lade ill the Ih-ili.ih Miineiiin. 
* This measurement is a little exaggerated, through the distortion due to crushing. 
