440 BRITISH FOSSIL REPTILES. 



portion of jaw (PL 12, fig. 3), and of that figured in PL 7, fig- 6, «, b, c- The total 

 length of the tooth (fig. 4) cannot have been less than 4 inches. 



If the present fragment has belonged to an individual of the same species 

 as that on the upper jaw of which the Pterodacti/lus Fittoni is founded, it shows 

 such species to have attained more than double the dimensions indicated by 

 the original specimens figured in PL 7, figs. 3 and 4. Should the present 

 fragment prove to belong to a distinct species, with the sides of the jaw meeting 

 above, at a less acute angle, and with the wall of the outlet of the socket less 

 prominent externally, such species may be indicated as the Pterodadi/lus Wood- 

 wardi, in honour of the founder of the Geological Collection of the University of 

 Cambridge. 



The Mandible (PL 11, figs. 6—10). 



The portion of the right ramus of the lower jaw, or mandible, figured in the 

 above-cited plate, may have belonged, by its size, to either of the gigantic 

 Pterodactyles above specified as Pt. simus and Ft. Woodwardi. Its texture and 

 configuration show it to have formed part of a Pterosaurian skeleton. It is the 

 part of the ramus which answers to the angular, sur-angular, and articular elements 

 in the FferodacfijJus sueviciis* but with only a part of the sutures between the 

 angular and sur-angular remaining on the inner side of the bone. The angle is 

 partially fractured, but seems to have been not much produced beyond the articular 

 concavity. 



The ramus, as it extends forward from the articular part, at first diminished 

 slightly in breadth and depth, then increases in vertical, whilst continuing to 

 decrease in transverse, extent. 



The outer surface (fig. 7) presents, near the articular cavity, a shallow, 

 longitudinal depression, bounded below by a rather sharp border ; a broader and 

 more shallow depression, the lower boundary of which is well defined, marks the 

 more advanced part of the ramus. These depressions indicate the insertions of 

 muscles. 



Both the upper (fig. 9) and lower (fig. 8) borders are obtusely rounded, the 

 latter being the thickest. Along the inner side of the fragment a longitudinal 

 channel (fig. 6, e) extends near the lower border, the upper boundary of the 

 channel being produced inwards, especially posteriorly (j) ; above this boundary 

 there is a deep, longitudinal depression {d) partly filled with matrix, and probably 

 communicating with the (pneumatic ?) cavity of this part of the jaw-bone. 



The longitudinal depression (fig. 6, d) is bounded below by the angular element, 



* Quenstedt, ' Ueber Pterodactylus mevicus,' 4to, 1855, tab. i, figs. 2, 4, 5. 



