78 ON THE STRUCTURES AND DISTRIBUTION OF THE 



shortest, and are rather depressed at their articulation with the ribs, which are the 

 longest, nearly straight and slightly widened distally. The fourth diai^ophyses is 

 equal to the third, but heavier and directed anteriorly ; its rib is transverse, heavier, 

 but shorter than the last. 



The cranium is broad, with its whole surface roughened by the development of 

 numerous minute, inosculating ridges, forming a coarser pattern than in any recent 

 species, and leaving a nodular relief. The temporal fossa was overarched by a 

 thick lamina, as portions remaining indicate, and the ossification formed a supra- 

 orbital ala beyond the brain case, as in Latonia s e y f r i e d i and Ceratophrys. The 

 impression of the fronto-parietal bones is interrupted medially by an elongate oval 

 elevation of the matrix. This is bounded before by the concave border of a smooth 

 bone, whose impression is of the usual form of the superior ethmoid plate. I cannot 

 conceive this to be anything other than an indication of a frontoparietal fontanelle, 

 though I know of .no form combining this feature with dermoossification, or the 

 overarched temporal fossae. The impressions of the prefrontals are very distinct ; 

 the greater part of the substance of one remains. Their form bears some resemblance 

 to that in Pelobates ; their common anterior suture does not measure one-half their 

 longitudinal extent. The superior ethmoid plate presents a narroio postei^ior con- 

 cavity for the fontanelle; it has left no rugose impression in the matrix. The 

 frontoparietals exhibit a broad lateral wing, as occurs in Latonia and Pelobates, 

 which passes into the postorbito-temporal arch. The latter is broad, and continues 

 into a strong posterior dilatation of the " temporo-mastoid," which includes with the 

 end of the quadratum a deep sinus. 



The anterior limb is elongate. Scapula and supra-scapula preserved, undivided : hu- 

 merus broad proximally, and with a right anterior outline, which is probably a bicipi- 

 tal ridge ; no apparent posterior ridge. Distally more transversely compressed than in 

 Pelobates f u sc us, at the base of the prominent condyle. Forearm with two distal 

 longitudinal grooves. The impressions of the carpals are very distinct ; that of the 

 lunare larger than that of the cuneiforme ; and that of the unciforme representing a 

 bone larger than any other, but not prominent. The impressions visible are three 

 proximal, two distal. The fingers are elongate. 



The sternum and one arm were pressed across the cranium, and are mutilated ; 

 hence the important point as to whether the xiphisternum is bifurcate or styloid 

 remains for a more fortunate observer. Measurements are as follows : 



In. Ijines. 



Length from end muzzle to posterior margin ethmoid, ... 5 



" " level of occipital condyle, . . . 12-5' 



Interorbital breadth (behind middle), 5-3 



Breadth of temporal arch, ......... 4-3 



