ANTHRACOSATTKrDiE. 



163 



Genus LOXOMMA, Huxley 1 . 



Syn. Orthosaurus, Barkas 2 . 

 Macrosaurus, Barkas 3 . 

 Megalocephalus, Barkas 4 . 



Skull (fig. 37) forming an isosceles triangle, with large postero- 

 external expansions, small epiotic cornua, and very deep auditory 

 slits ; orbits very large, of irregular oval contour, with a projecting 



Fiar. 37. 



Loxomma allmani. — Frontal aspect of cranium, with the sculpture omitted ; 

 from the Carboniferous of Northumberland. About \. PF, prefrontal. 

 Other letters as in fig. 31. (After Miall) 



process from the inner and outer borders a short distance behind 

 the middle ; nares small, oval, and widely separated ; a lyra 

 situated on two preorbital ridges ; frontal excluded from orbit by 

 junction of prefrontal and postfrontal ; anterior border of orbit 

 formed by prefrontal and lachrymal. Premaxillary teeth three or 

 four in number, and larger than those of maxilla ; large palato- 

 vomerine tusks before and behind posterior nares ; mandibular 

 teeth few, unequal, and many of them very large. Crowns of teeth 



1 Quart. Journ. Geol. Soc. vol. xviii. p. 293 (1862). 



2 Coal-Measure Palaeontology, p. 61, pi. viii. (1873). 



3 Ibid,, p. 58, pi. vii. 



i Ibid. p. 69, pi. ix. fig. 189. In description incorrectly given as pi. viii. 



m2 



