1883.] b^J [Cope. 



of various sizes and shapes. They resemble shining seeds. In K nitidua 

 these points are wanting, but there are rugosities on the postfrontal and 

 pterotic regions of a radiating character, not found in B. ciceronius. 

 Measurements. M. 



No. 1. 



Length of skull to occiput above (muzzle worn) 069 



Interorbital width 014 



No. 2. 



Length of osseous base of cranium (parachordal) 039 



" open median groove 023 



Width of base at parachordals 036 



" groove at apices of parachordals Oil 



" foramen notochordse 0095 



Found by Mr. "W. F. Cummins. 



Gnathobhiza serrata, gen. et sp. nov. 



This presumed fish is represented by some teeth which are processes of 

 osseous bodies, which may be roots properly so called, or may be jaws. 

 The osseous bases are shallow, and thickened on the free edge, which is 

 directed obliquely away from the plane of the crown of the teeth. The 

 teeth obtained are flat, and doubtless bilaterally symmetrical, though no 

 complete pairs are preserved. The largest of these has a curved edge, and 

 a branch extending posteriorly at right angles to it, joining it at a point at 

 one side of its middle. The longer (and more curved) part of the convex 

 edge, has two coarse angles ; the shorter part is finely denticulated, as is 

 the transverse lamina. The principal edge is worn posteriorly by use. The 

 external convex face is marked by coarse and finer lines of growth, like 

 those on corneous processes. A second form of tooth is not curved, but flat, 

 so far as preserved. It has three coarse obtuse teeth. Two other toothed 

 bodies resemble it. All the teeth are covered with brilliant ganoine on 

 both sides. 



3Ieasurements. M. 



Length of chord of larger tooth 010 



" cross lamina 0055 



Elevation of principal edge 006 



with root 008 



Thickness of root at base 003 



The genus Gnathorhiza may belong to the Petalodont family, though I 

 think it very doubtful. The characters of the roots of the teeth are more 

 like those of sharks. 



BATRACHIA. 



Trimerorhachis bilobatus, sp. nov. 



Among the many specimens of animals of this genus which have passed 

 through my hands, I have not until now been able to select more than one 



