1859.] HFXLET DICTNODON. 555 



rounded, not short and siibtruncate ; 2. The less remote eyes, and 

 3. The gently curved, not abruptly bent, pleurae. The margin and 

 head-spines are lost, but the former was probably not so thick as in 

 G, striatus ; while the radiation of the cheeks is far less conspicuous. 



3. Aswphus (or Olenus^). (Figs. 3 & 4.) 



There is a rather obscure trilobite (fig. 3) in the " Calciferous 

 Sandrock" or " Chazy Limestone" of Grenville (Ottawa, in Canada), 

 which Sir "W. E. Logan discovered and brought to England. It may, 

 I think, belong to the Olenidce, though certainly not to Paradoxides, 

 to which genus it was too hastily referred by me in Sir W. E. Logan's 



Fig. 3.- — Portion of the head of Fig. 4. — Caudal shield of an 

 an Asaphus or Olenus, from Asaphus (?), from Ottawa, 



Ottawa, Canada. Canada. (IS^atural size.) 



(jS"atural size.) 



paper*. The great size of the curved eyes, and the obscure glabeUa- 

 lobes give it much the aspect of Proetus, and the finely granular 

 surface offers no contradiction to this view ; but no Proetus is known 

 with the glabella as wide in front as behind. It may be a new form 

 allied to Asaphus, but the granular surface is an anomaly iu that 

 group. On the whole its affinities are so obscure that, until better 

 specimens are obtained, it would be useless to give it a name ; and 

 I only figure it here to show that it does not belong to the genus 

 to which I at first referred it, nor, so far as I can see, to any of the 

 characteristic genera of the Primordial group. 



It is not a very uncommon species. Fig. 4 shows the caudal 

 shield associated with it, and which is like that of some Asajphidce. 



3. On a New Species of DicYisroDON- (D. Murrayi) from near Coles- 

 BEKG,SoT7TH Africa. By Profcssor T. H. Htjxley, F.E,.S., Sec.G.S. 



(Abstract.) 

 [The pubUcation of this Paper is deferred.] 



For the original specimen from which Professor Huxley first (in the 

 spring of last year) obtained evidence of the existence of this species, 

 he was indebted to the Eev. H. M. White, of Andover, who subse- 

 quently put the author in communication with the discoverer of the 

 fossil, Mr. J. A. Murray, and the latter gentleman having written 

 to his father, resident in South Africa, obtained for Professor Huxley 

 a large quantity of similar fossil remains. One specimen in par- 



* Quart. Journ. Geol. Soc. vol. vui. p. 207, note. 



