102 
Fig. 22. IDinesus ida, Eth. fil. A pygidium. M.D. coll. (7800). x 3. 
Fig. 23. Saratogia cf. hamulus , Owen sp. Fragmentary cast of a genal 
spine. M.D. coll. (7792). x 3. 
Fig. 24. %Saratogia rugulata, sp. nov. A free cheek. M.D. coll. (7886). 
x 3. 
Fig. 25. cf. Saukia sp. A cranidium resembling S. pepinensis , Owen sp. 
M.D. coll. (7802). x 3. 
Fig. 26. cf. Saukia sp. A genal spine. M.D. coll. (7795). x 3. 
Fig. 27. Notasaphus fergusoni, Gregory. A nearly complete cranidium, 
showing neck ring, and faint transverse furrows. M.D. coll. (7926). x 3. 
Fig. 28. Ditto. Pygidium with rather numerous spines. M.D. coll 
(7791). x 3. 
Fig. 29. Ditto. Pygidium with few spines of a stouter character than 
the foregoing specimen, and with narrower axis. M.D. coll. (7810). x 3. 
Fig. 30. Lepeditta knowsleyensis, Chapman sp. A wax squeeze taken 
from interior of valve. M.D. coll. (308). x 5. 
