361 



in the absence of a tooth between the conjoined sepals and 

 in the possession of an acute sinus as opposed to an obtuse 

 one in nana; in the labellum, which is short and bluntly 

 oblong in the latter species. P. pyramidalis possesses a tooth 

 between the conjoined sepals, a wide sinus, and a short, bluntly 

 oblong labellum. These features, as in the case of P. nana, 

 serve to distinguish it from the new species. 



EXPLANATION OF PLATE XVIII. 



I. Caladenia Bryceana: — 



Fig. 1. — Plant, natural size, side view. 



Fig. 2. — Plant, natural size, front view. 



Fig. 3. — Labellum, showing upper-surface with large basal 

 appendage. 



Fig. 4. — Labellum from below, showing appendage and sig- 

 moidal middle lobe. 



Fig. 5.— Labellum from side, showing appendage, sigmoidal 

 middle lobe, and the conspicuously raised calli on the lamina. 



Figs. 6 and 7. — Two views of basal appendage (much enlarged). 



Figs. 8, 9, and 10. — Showing the column from the front, back, 

 and side respectively. 



II. Pterostylis Veree-nce: — 



Figs. 1 and 2.— The plant (natural size) from the side and 

 front respectively. 



Figs. 3 and 4. — Column from the front and side. 



Fig. 5. — Labellum, showing upper-surface with mesial ridge 

 and basal appendage. 



Fig. 6. — Labellum, showing lower-surface with longitudinal 

 "furrow and claw. 



Fig. 7. — Labellum from the side. 



Fig. 8. — Penicillate basal appendage (enlarged), showing 

 Tecurved middle lobe and the two lateral lobes. 



