BY R. ETHERIDGE, JUNR., AND JOHN MITCHELL. o09 



Plate xxvi. 



SphiVi'exochiis minis Beyrich. 



Fig. 1. — A small, nearly complete specimen. (Coll. Sydnej' Univeisitj'). 



This is probably tlie specimen figured hy C. Jenkins (lor. cif., ante). 



Fig.2. — Thorax and pygidium, with a detached free cheek and hypostome 



on the right. (Coll. Mitchell). 

 Fig. 3. — A rather imperfect individual. (Coll. Mitchell). 

 Fig. 4. — A rather large cephalon; depressed. (Coll. Mitchell). 

 Fig.-l. — Cephalon exhibiting normal tumidity. 



Bronte us howninf/ensis E. & M. 

 Fig. 6. — Imperfect pygidium, showing specific features very clearly. (Coll. 

 Mitchell). 



Brontens mesemhrinu.'i E. & M. 

 Fig. 7. — A complete pygidium. (Coll. Mitchell). 



Brontens mohngensis E. & M. 

 Fig. 8. — Pygidium almost complete. (Coll. Mitchell). 

 Brontens awpisticaifdatus E. & M. 

 Fig. 9. — Portion of a pygidium, showing the ill-defined axis, axial furrows, 



and pleural features verj' well. (Coll. Sydney Technical College). 

 Fig. 10. — The complete pygidium with only a part of the test on, exhibit- 

 ing the relativelj'long and narrow outline. (Coll. Sydney Technical 

 College). 



CrotalocephaJns scnJ'ptn<i E. & M. 

 Fig. 11. — Cephalon without free cheeks. (Coll. Sydney Tecimical College). 



Bonnyongia boirningensis E. & M. 

 Fig. 12. — A nearlj' perfect head, and portions of five somites of the thorax. 

 The head shows the two tuberculate spine-scars in front of the neck- 

 ring, and other specific features. (Coll. Mitchell). 

 Fig. 13. — A younger specimen, showing neck-ring and furrow plainh'. anil 

 the obsolescence of the latter mediallj'. Features liave been inked 

 in. (Coll. Mitchell). 



(Photos by C. Clutton and J. Mitchell). 



Plate xxvii. 

 Calymene anstralis E. & M. 

 Fig. 1. — A specimen showing the nodules at the bases of tlie axial rings 

 very distinctly. (Coll. Mitchell). 



Harpes trimicfeoides E. & M. 

 Fig.*2. — A very fine, mature specimen, showing twenty to twenty-one 



somites; ( xf). (Coll. Mitchell). 

 Fig. .3. — Cephalon showing the eyes, glabella, and ornamentation veiy 

 clearl\' under magnifying glass; (slightly enlarged). (Coll. Mitchell). 



37 



