CTs 
689 rH 
HORA 
S 
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me ; AIR a 
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as 
Figs. 80-82. — Pterichthys testudinarius, Ag.; restored by R. H. TRAQUAIR, from the 
dorsal aspect (80), ventral aspect (81), and lateral aspect (82). The double dotted lines 
indicate the grooves of the sensory canal system; and in the trunk, the thick lines repre- 
sent the exposed borders of the plate, the thin line showing the extent of the overlap, 
ADL, Anterior dorso-lateral. AMD. Anterior median dorsal. AVL. Anterior ventro- 
lateral. JZ. Extra-lateral (or operculum), JZ. Labial. M/OCC, Median occipital. PAZ 
Premedian, PDL, Posterior dorso-lateral. PMD, Posterior median dorsal. PVL, Pos- 
terior ventro-lateral, SZ. Semilunar. (Figure from SMITH WOODWARD.) 
68 : 
