300 
TEllTIAllY VEKTEIEiATA OF THE FAYtJM. 
tlie ])lastr()n in tlio "roove l)et\vceu the humeral [ii.) and pectoral {p.) shields. In some 
s])eeimens tin* njjper surface of the epiplastrals is raised into a sort of boss near their 
])osterior an^le, and from this a slight ridge is continued backwards to the axillary 
l)uttress. The suture between the hyo- and hypoplastrals {llyp.p.) crosses 
th(' middle of the bridge and terminates at the inner angles of the small meso- 
jilastrals {Ms.p.), which are irregularly hexagonal in outline and are wedged in between 
the outer ends of the hyo- and hy]a)plastrals and the marginals. The sutures 
between the hypoplastrals and xiphiplastrals {XLp.) make an angle of about 115° 
with the middle line, and are slightly convex forwards. The posterior border of the 
])lastron seems to have been notched in the middle line as in S. lihyca, but in no 
specimen is this region well preserved. 
The arrangement of the horny scutes on the plastron is only known in the case of 
the anterior region. The intergular [ig.) is very large, its posterior point being about 
on the middle of the entoplastron. Both the gulais {g.) and humerals (/^.) are very 
small and widely separated by the intergular. In Stercogenys podocnemiohles, Reinach, 
the humerals are much larger and their posterior angles coincide with that of the 
intergular; this condition is transitional to Fodocnemis, in wdiich both the gulars and 
humerals meet in median suture behind the intergular. 
C. 10027. Skull and mandible, found actually articulated with each other. The skull is somewhat 
crushed and is imperfect in the premaxillary region. Many of the sutures are obscured 
by a coating of gypsum. Ty})e specimen de.scribed and figured in Geol. Mag. [4] 
vol. viii. (1901) i)[). 442-3, fig. 4 ; also on PI. XXY". figs. 2, 3. The dimensions (in 
centimetres) of this specimen are : — 
Skull : 
Extreme length in middle line 
„ „ from end of the scpiamosals 
Greatest width (at tympanic opeuiug) 
Width between the ends of the ectopterygoid processes . 
„ „ outer ends of quadrate articulations . . 
„ of quadrate articulation 
Distance from internal nares to tip of nose 
AVidth of palate 
90 
tO-5 
9-8* 
(io 
7'5 
1-4 
4 
o 
IMandible : 
Total lengtli 
Length of syaqiliysis . . 
AVidth at coronoid process 
articular surfaces for quadrate . 
E. 3007. Plaster casts of the above specimens. 
Made in the Ih-itish Miisemn. 
This measurement is a little exaggerated, througli the distortion due to crushing. 
