4 On ihe Oi uithosaufiian Rlianiphorliynclin'^. 



]iortion is very sliovt nnd deej). The external iiarial opciiiii;: 

 [iia.) of each side is liiyli on tlie face, perhaps dorsally ])hiced. 

 Its hTigfh is soniewliat doubtful, but certainly h>ss than halt" 

 that ot the snout in front of it. It is separated by a broad 

 bar from the antorbital vacuity {nov.), whicii is well below 

 but begins sc;ircely further back. This vacuity is also elm- 

 pated and narrow, about three times as long as deej). Most 

 of its ]")Osterior margin is broken away in the fossil, so that bv 

 accident it appears to be directly continuous with the orI)it 

 {orb.\ The rock is traversed by a fracture across this cavity, 

 but the bones do not seem to have been displaced. 'J'lie 

 orbit is very large, as usual, and widest above where it 

 excavates the frontal region. Its maximum width does not 

 much exceed its maximum depth. Tlie length of the ))ost- 

 orbital region of the craniun) is nearly, if not quite, equal to 

 the maximum width of the orbit, and the lateral temporal 

 vacuity {Itv.) is much larger than is usual in Rliampho- 

 rhynchus. This vacuity is bounded in front, above, and 

 below by a rather broad bar ; but the posterior bar is 

 narrower. The superior temporal vacuity, though inconi- 

 ])lettly exposed, is seen to be correspondingly large. The 

 oral border of tlie skull exhibits a series of well-separated 

 protuberances for the insertion of nine teetli, and then curves 

 slightly downwards to the mandibular articulation. The 

 mandible {v}d.) is very slender and is exjjosed sufficiently 

 from beneath to show the extent of the symphysis. Tiie 

 latter (s.) occu])ies one quarter of the total length of the Jaw, 

 is very much laterally compressed, and curves gently upwards 

 in a toothless beak. The large size of the tooth-sockets in 

 the dentary imparts a wavy ap])earance to the bone of the 

 oral border of the mandible. The teeth of both jaws are 

 large, smooth, and laterally compressed, and very obliquely 

 inserted in the ordinary manner. Those of the two Jaws 

 alternate and interlock, the foremost pair being in the u|)per 

 jaw. Only a few are preserved, but they are shown to vary 

 in size, and the two hindermost teeth — jiresumably those of 

 the maxilla — are relatively small. There are many slight 

 fissures in the bones, but none can be definitely recognized as 

 sutures. 



This head is readily distinguished from that of Rluimpho- 

 rhyuchus Gcnimingi and the three other satisfactojily known 

 species of li/tQinj/ior/n/nchus by the form "of the beak and the 

 elongate proportions of the cranial region. It therefore seems 

 to indicate a distinct species of this genus, which is larger 

 than any hitherto discovered, and may be named Hnamj/Zio- 

 rhyiichus hmgiceps^ in allusion to the most remarkable feature 



