BY K. ETHERIDGE, JUNE., AND JOHN MITCHELL. 707 



Genus Ceratocephala, Warder, 1 838. 



Ceratocephala, Wsirder, Am. Journ. Sci., 1838, xxxiv., p. 377. 

 7'rape!ocera, Corda, Prod. Bohm. Trilobiten, 1847, p. 158. 

 Trapelocera, Angelin, Pal. Scandinavia, 1878 (Lindstrom's edit.) 



p. 34. 

 Ceratocephala, Clarke, 10th Ann. Rept. State Geol N. York for 

 1890 (1891), p. 67. 

 Ohs. — Mr. J. M. Clarke has already indicated the lines on 

 which this name should be used, and it is here adopted by us in 

 conformity with his researches, except that we employ it as one 

 of the genera of the Odontopleurida^ rather than as the typical 

 generic name of the whole group, superseding Acidaspis, for 

 reasons already given. 



In Australia Ceratocphala is represented by four species, so 

 far as we have been able to ascertain, viz. : — 

 Ceratocephala Jackii, nobis. 

 „ Vogdesi, „ 



,, imped ita, nobis. 



,, longispina, Mitchell. 



The last may possibly appertain to the genus Selenopeltis, Corda. 



Ceratocephala Vogdesi, sp.nov. 



(PI. L., figs. 8 and 9; PL Li., figs. 1-7; PL lih., fig. 9.) 



Acidaspis Verneuili, Ratte (non Barr.), or A. vesiculosa, Ratte (nan 



Beyr.), Proc. Linn. Soc. N.S. Wales, 1886, i. (2), Pt. 4, p. 1066, 



t. 15, f. 5-10. 



Acidaspis Prevosil, Ratte {non Barr.), Loc. cit., p. 1068, t. 15, 



f.ll (excL f. 12). 



Sp. Char. — Suboblong or oblong-ovoid. Cej^halic shield or 



cephalon. —^uholAong, of complex structure, moderately tumid, 



rugose and tuberculate throughout, twice as wide as long, front 



margin rather straight and centrally slightly projecting; tubercles 



of various sizes, and some very conspicuous. Glabella: — Central 



lobe large, suboblong, front latei'al expansions very distinct, only 



