381 



To the original description may be added that the sur- 

 face of each cheek rises into a low blunt tubercle. 

 Loc. — Associated with Agnostus elkedraensis . 

 Hot. — Cambrian (Etheridge). 



Genus Dinesus, Eth. fil., 1896 

 (Proc. Roy. Soc. Vict., viii. (n.s.), 1896, p. 56). 



Dinesus ida, Eth. fil. 

 B. ida, Eth. fill.: Ibid, p. 56, pi. i. 



D. ida, Gregory: Ibid, k.v. (n.s.), pt. ii., 1903, d. 155, 

 pi. xxvi., figs. 8-10. 



Obs. — On the subject of the fragmentary remains of this 

 Trilobite, Mr. C. D. Walcott remarked: — "The genus 

 Dinesus, Etheridge, jr., appears to be more nearly related 

 to Da me sella or Dorypygella, Walcott. Its marked charac- 

 teristics are: the elongate oval glabella with the small, dis- 

 tinct antero-lateral and postero-lateral lobes; the small 

 palpebral lobes ; and the large pygidium with a spinose 

 border." ( 36 > A comparison with Dorypyge and several other 

 genera will be found in the original description. 



Prof. J. W. Gregory would combine the pygidia described 

 by me as those of D. ida with his JYotasaphtcs fergusoni, but 

 too little of both these forms is at present known to define 

 their respective limits. 



Loc. — Near Mount Ida, near Heathcote, Victoria. 



Hor. — Cambrian (Etheridge) ; Ordovician (Gregory) ; 

 Cambrian or Lower Silurian (McCoy); Lower Silurian, "low 

 down" (T. S. Hall). 



Genus Olenellus, J. Hall, 1862 

 {15th Ann. Rep. N. York State Cab. Nat. Hist., 1862, p. 114). 



Olenellus (? ) browni, Eth. fil. 



0. browni, Eth. fil. : Off. Contributions Pal. S. Austr., No. 

 9 (S. Austr. Pari. Papers, 1897, No. 127), 1897, p. 13, pi. i., 



fig. 1. 



Obs. — It is impossible to assign this Trilobite to its cor- 

 rect generic position pending the discovery of more complete 

 material, especially the pygidium, the structure of which 

 would at once decide the question. So far as the characters 

 are decipherable they appear to be those of Olenellus, more 

 particularly from the fact that through the absence of facial 

 sutures the "free cheeks" are in one with the other parts of 

 the cephalic shield. 



Loc. — Alexandria Cattle Station, Playford Creek, Barkly 

 Tableland (110 miles north-west of Camoweal). 



Hot. — Cambrian (Etheridge). 



(36) Walcott: Proc. U.S.A. Nat. Mus., xxix., 1905, p. 35. 



