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. 
II. meridianus vies in size with the large H. Angelim, Barr., 
from Etage D. of the Bohemian classification, and H. 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 Haus- 
•mannia* suggested by these authors for the "typical and 
unvaried forms of Dalmanites, which follow the type of D. caudatus 
(Briinnich) Emm rich, and D. Hausmanni, Brong." 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 
Paleontologists 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.,f 
possesses eighteen, and several American species are found to 
have an increased number over that seen in the typical H. 
caudatus. 
Log. and Horizon. — 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. 
* Pal. N. York, 1888, vii. p. xxxi. 
t Burmeister, Organization of Trilobites (Ray Soc), 1846, t. 5, f. 10. 
