[Proc. Eoy. Soc. Victoria, 24 (N.S.), Pt. 11., 1911.] 



AkT. XXI. — New or LittU-Known Victorian Fossils in 

 the National Mttseum. 



Part XIV. — On somk Silurian Trilobites. 



By Frederick cHAPMAisr, a.l.s., &c. 



(National Museum, Melbourne). 



(With Plates LXI-LXIII). 



[Read 2nd November, 1911]. 



Introductopy Remarks. 



The trilobite fauna of the Victorian silurian beds is exceed- 

 ingly rich, as proved by the Large number of new forms being 

 gathered into the Museum collections. It was at first intended 

 to deal with the group as a whole in monograph form, but 

 since this would involve more time than could be spared from 

 other more urgent work at present, it seemed better in the 

 meantime, to submit for publication descriptions of a few of the 

 more interesting species. 



The forms described below show many points of affinity with 

 trilobites already known from Europe and North America. Per- 

 haps the most inie esting of these is the occurrence of a species, 

 Homalonotus vomer, allied to the well-known wenlock guide 

 fossil, H. delphinocejyhulus. Green sp. A noteworthy feature 

 of the occurrence of this species at Wandong is its association 

 with Dahnanites meridianus, Eth. fil. and Mitch., sp., a tri- 

 lobite closely allied to the wenlock species, D. caudatus. 

 The following forms are here described : — 



Ampyx parvulus, Forbes, var. jihaensis, var. nov. 



Ampyx yar?riejisis, sp. nov. 



Illaenus jutsoni, sp. nov. 



Encrinurus {Cromus) spryi, sp. nov. 



Homalonotus vomer, sp. nov. 



