[LAMBE] . ON A NEW CROCODILIAN GENUS 225 
The surface of the angular is also rough but in it the sculpture con- 
sists principally of ridges, following the curve of the lower margin of the 
jaw, and separated by deep and rather,irregular grooves. The dentary 
on the whole of its outer and lower surface exhibits numerous scattered 
vascular openings leading obliquely forward into the interior of the 
bone. Its lower surface anteriorly is roughened by numerous longi- 
tudinal grooves inclined toward the symphysis. 
The specimen (cat. No. 808) shown in plate I, fig. 2, is the an- 
terior end of a ramus larger than the type. The alveoli of the first 
five teeth are preserved with the base of the large fourth tooth still in 
its socket and enclosing ‘a successional tooth within. This specimen 
gives the form of the whole of the anterior end of the ramus and 
supplies that part of the symphysis in which the type specimen is 
deficient. It shows the front termination of the dentary groove and 
the surface to which the splenial was applied. 
Measurements of left ramus of mandible. 
MM 
malien Onn Gt NPATNUS! Lit... eile mn clea ede 335 
Breadth of ramus through centre of alveolus for fourth tooth .. 31 
Height of symphysis in line with same alveolus ............ 18 
Estimated length of symphysis ....... ae Seen co aCe 5? 
Pet sympas presenved 22.11. does 33 
Length of splenial contribution to symphysis ............... 11.5 
Dénetehosnostsymphystal foramen (Lj... ley se eis eter oe oe 7.5 
TENE ON Et ERIE a" AAC el a ee ra ei ar 3.2 
Height of splenial behind above foramen .................. 16 
Breadth of dentary at alveolus for eighth tooth .............. 18 
Height of same in line with same alveolus ..............4- my ese) 
Height of ramus at posterior end of external mandibular 
RE AR MS aa. 2e ei js reves ous nee Ie 53 
Thickness of angular a little above lower border where last 
IMÉHÉUTEMeNEUNaAS ARE EE... EN RME Re 16 
Thickness of surangular at upper border ditto ............... 8.5 
Length occupied by alveoli from fourth to eighteenth tooth.... 128 
POSTERIOR PORTION OF THE CRANIUM. 
The specimen already mentioned as the posterior portion of a 
cranium (cat. No. 1551) includes that part of the skull behind an 
imaginary transverse plane passing vertically downward from the 
frontal suture of the coaiesced parietals. The squamosals, postfrontals 
and quadratojugals are missing but the quadrates are preserved almost 
