212 MESSRS. HANCOCK AND ATTHEY 



the parietals and occipitals (that is, from the point where the 

 transverse double line divides these two sets of bones), and are 

 continued to the base of the outer horns ; there are three or four 

 of such lines on each side. Also from the base of the outer 

 horns other three or four somewhat interrupted lines stretch 

 diagonally forwards and inwards, extending nearly as far as the 

 front of the parietals. At the posterior margin of the lateral 

 expansions, and parallel to it, there are likewise two or three 

 obscure lines. 



Besides these lines, the occipital area and lateral expansions 

 are irregularly tuberculated ; in front the skull is comparatively 

 smooth ; but the whole surface, including the ridges and tuber- 

 cles, as well as the smooth portions, is covered with a minute 

 reticulation of raised ridges ; the meshes, being deeply sunk, 

 give, when seen under a lens, a punctured appearance, and when 

 so magnified, this minute reticulation much resembles the usual 

 Labyrinthodont honeycomb-like surface-structure. 



The under surface of the specimen displays the roof of the 

 mouth, which, though imperfect, exhibits some very interesting 

 characters. In front the remains of the prsemaxillas are seen at 

 either side doubled inwards and pressed down ; they seem to 

 have been short, probably not much over six-tenths of an inch 

 in length. That of the right side is nearly entire, and lies with 

 its outer surface exposed, which is covered with a minute reti- 

 culation of raised lines. The posterior extremity is considerably 

 produced beyond the teeth, and is pointed and conical. This 

 process is apparently for cartilaginous attachment. The alveolar 

 border is straight and thick, and contains seven teeth, three or 

 four of which are perfect ; they are close -set, stout, and slightly 

 incurved, with the tips rather abruptly pointed, a little com- 

 pressed in the direction of the length of the jaw, and finely and 

 sharply striated, the striae being raised; the base and middle 

 portion are smooth and cylindrical. A mere trace of the left 

 prsemaxilla is visible ; but four or five of its teeth are pressed 

 down upon the vomer. These teeth are well preserved, and 

 have all the characters of those of the right side. 



The vomer is largely developed, and extends backward quite 



