508 SILURIAN TRILOBITES, 



but our species never has. Such granules are not to be 

 confounded with the tubercular nodes at the outer ends of the 

 segments. 



H. meridiarius vies in size with the large H. Angeliiii, Barr., 

 from Etage D. of the Bohemian classification, and //. rugosa, 

 Corda, but both of these are sub-mucronate in front, and possess 

 much longer genal spines, and other points of departure. 



It unquestionably falls into Hall and Clarke's section IJaus- 

 mannia* suggested by these authors for the "typical and 

 unvaried forms of Dahnanites, which follow the type of D. caudatus 

 (Briinnich) Emmrich, and D. IIausmanni,Broj\g." As, however, 

 D. caudatus was selected by Barrande as the type of his genus 

 Dalmanites, it follows that Hall and Clarke's term must be 

 synonymous with the latter, a point that it is strange did not 

 strike these eminent writers. At the same time we have here a 

 solution of the generic difficulty, for if by common consent the 

 name Dalmanites is not to stand, that proposed by the American 

 Palaeontologists will take its place. 



The large increase in the number of pygidium segments in the 

 Australian Trilobite is not peculiar to that species. H. auriculata^ 

 Barr., has twenty-three axial rings, //. Hausmanni^ Brong.,t 

 possesses eighteen, and several American species are found to 

 have an increased number over that seen in the typical H. 

 caudatus. 



Loc. and Ho7'izon. — Bowning, Co. Harden, Upper and Middle 

 Trilobite Beds; Hatton's Corner, near Yass; Limestone Creek, 

 near Bowning, Co. Harden — Bowning or Hume Series — 1 Wenlock. 

 Coll. — Mitchell; Mining and Geol. Museum, Dept. Mines, 

 Sydney ; Australian Museum, Sydney. 



D. meridianus is another of the most persistent of our Upper 

 Silurian forms, being met with near the base, and also at the 

 close of the Bowning Series. 



* Peal. N. York, 1888, vii. p. xxxi. 

 + Burmeister, Organization of Trilobites (Ray Soc), 1846, t. 5, f. 10. 



