iET. 21 OEDOVICIAN TRILOBITES — ULRICH 7 



genus represents a family." More recently Raymond^ in proposing 

 and defining the new family name Cyclopygidae instead of Aeglinidae 

 Pictet — on the ground that Aeglina, which Barrande proposed in 

 1852 for his preoccupied term Egle, had in 1847 been given the name 

 Oyclopyge by Corda — included Telephus as its third and last genus. 



As the above heading indicates, I agree with Hadding and Angelin 

 in viewing Telephus as representing a family that is quite distinct 

 from both Remopleuridae and Cyclopygidae. Neither of those 

 families seems to have any convincingly indicated relatives in pre- 

 Ordovician faunas so far discovered. Still it has been rather gen- 

 erally assumed that the Remopleuridae are direct descendants of 

 Paradoxides, and,, as both are members of the Middle Atlantic fauna, 

 I am inclined to admit their genetic relationship. However, Ray- 

 mond, in the work just cited, suggests "that it is more probable that 

 the proximate ancestor (of Remopleurides) is to be found in the 

 Dikelocephalidae," a view that receives no support from my own 

 work on the trilobites of the latter family. Among more probable 

 progenitors of Remopleuridae, referring particularly to such rather 

 aberrant members as Robergia marginata Raymond, Apatocephalus 

 should be mentioned. As to the ancestors of Oyclopyge and its im- 

 mediate allies, I do not recall that anyone has ventured a satis- 

 factory opinion. In my estimation they still occupy unheralded 

 ground. Telephus^ on the other hand, does remind rather strongly 

 of certain Upper Cambrian and early Ozarkian trilobites. I refer, 

 namely, to Irvingella and C hariocephalus^ two genera that have 

 given us much trouble to classify but which I now find to agree well 

 enough with Telephus in their cranidia, eyes, and other details of 

 their free cheeks, and in their pygidia to convince me of the pro- 

 priety of their reference to the Telephidae. The Cambrian and 

 Ozarkian representatives of the family originated in the Arctic 

 realm, but so far as known they left no record in subsequent in- 

 vasions of North America from that source. Probably they became 

 extinct there but continued their development through migrants 

 to the middle Atlantic realm which supplied the faunas that at sub- 

 sequent Ordovican times invaded epicontinental basins in eastern 

 North America and Europe. 



There are two other genera of trilobites in American Upper 

 Chazyan deposits that seem to fit much better in the family Tele- 

 phidae than in any other now established. One of these is Glaphurus 

 Raymond, based on Arionellus pustulatus Walcott, 1880, from the 

 reefy beds at the base of the Upper Chazy on Isle La Motte and 

 elsewhere in the • Champlain Valley. A close ally of this species 

 occurs in the Whitesburg limestone in southwestern Virginia and at 



9 Raymond, Percy E., 1925, Bull. Mus. Comp. Zoology, vol. 67, No. 1, p. 64. 



