39 
Interbrackial spaces of the oral side covered by few, irregular 
plates, none of thera being conspicuously larger tlian the others. 
Oral shields as broad as long, with a somewhat rounded apex in- 
Fig. 2. 
Tig. 3. 
Fig. 2—3. Ophiozona tjalfiana. 2. oral side; 3. dorsal side. 15 /i. 
wards and a straight cut outer edge. Adoral shields meeting within, 
conspicuously widened at the outer end. Oral papillæ 6 to each 
side, the three outer larger, especially the penultimate. First ventral 
