Explanation of the plates. 
Plate I. 
Deima fastosum n. 
ig. 1. Side view; half natural size. 
. 2. Ventral surface; half natural size. 
. 3a. Upper aspect of a calcareous plate; highly magnified. 
g. 3 b. Side view of the same plate; highly magnified. 
Oneirophanta mutabilis n. 
Fig. 4. Side view; about two thirds of natural size. 
Fig. 5. Ventral surface; about two thirds of natural size. 
Fig. 6a—c. Calcareous plate; highly magnified. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Orphnurgus asper n. 
-”- 
7 a—e. Spicule, highly magnified. 
Achlyonice ecalcarea n. 
8. Ventral surface; about two thirds of natural size. 
Ilyodemon maculatus n. 
cp Side view; half natural size. 
10. Ventral surface; half natural size. 
11 a. Large wheel; highly magnified. 
11 b. Dichotomously branched plate; highly magnified. 
11 c. Small wheel; highly magnified. 
Letmogone Wyville Thomsoni n. 
12. Side view; about half natural size. 
13 a. Large wheel, 
13 b, Small wheel, 
13 c. Spicule, all highly magnified. 
