V. G. THORPE ON THP] LORICA IN THE GENUS BRACHIONUS. 231 



Figs. 3, 4, 5, and 6. — Diagrammatic longitudinal antero-pos- 

 terior sections of : — 



Fig. 3. — B. rubens ; line of demarcation between dorsal and 

 basal plates ill-defined. 

 „ 4. — B. rubens; line of demarcation between dorsal and 



basal plates well-defined. 

 ,, 5. — A species of BracMonus found in Ceylon, with com- 

 mencing prolongation of dorsal plate. 



„ 6. — BracMonus furculatus from South Africa; the dorsal 

 plate greatly prolonged. 



