446 TWO NEW TRIL0131TES PKOM BOWNING, 



and that from these Bowning Beds the Silurian Dalmanites group 

 of trilobites is absent, just as it is from etage E of the Bohemian 

 rocks. Recent study of the Bowning Series reveals a great break 

 in the sedimentary continuity between the Lower and Middle 

 Trilobite Beds of the Bowning Series, which when properly inves- 

 tigated, may greatly affect our conclusion respecting the age oi 

 the Middle Trilobite and succeeding Beds. Until the Family 

 I'hacopidae was dealt with by Etheridge, Junr., and j\ itched, the 

 trilobite now under review was generally considered to be Dal- 

 manites caudatus, but when the forms are contrasted it is seen 

 they differ very much from each other. As far as I have been able 

 to ascertain, I), perce-ensis Clarke (New York State Mus., Bull. 

 107, 1907, pp. 157-158) is one of the most closely related to our 

 species; but it differs from ours in possessing from fifteen to 

 seventeen pleural segments in the pygidium, etc. Dedicated to Mr. 

 F. Loomes, of Bowning, who obtained the fine specimen repre- 

 sented on Plate xv., fig. 1. 



Log. and hor. : Near Bowning Railway Station, Parish of 

 Bowning, County Harden; Yass-Burrowa Road, Lime Stone 

 Creek, Parish of Derrengullen, County King, etc. Upper and 

 Middle Trilobite Beds, Bowning and Yass Series, Upper Silurian, 

 and perhaps in the upper zone of its occurrence, Lower Devonian. 



On examining my trilobite specimens recently I came across one 

 so different to any other known to me that I have thought it 

 necessary to make of it the type of a new genus. 



Order PROPARIA. 



Family PHACOPID^. 



Subfamily PHACOPIN.E (Reed). 



Genus Adastocephalum,* g.n. 



Gen. diars. — Glabella subquadrate, mildly rounded in front, 



sides straight, only gently converging to the neck ring; lateral 



glabellar furrows and lobes absent. 



The outstanding features of this new type are the complete 



aSaaros, undivided- 



