352 CEESSWELL SHEARER, WAT/rER DE MORGAN, H. M. FUCHS. 
EXPLANATION OF PLATES 17 and 18, 
Illustrating the paper by Messrs. Cresswell Shearer, Walter 
De Morgan and H. M. Fuchs on “Paternal Characters 
in Echinoid Hybrids.” 
Lettering. 
a. cil. ep. Anterior ciliated epaulette, ech. r. Echinus-rudiment. 
gr. p. Green pigment, p. cil. ep. Posterior ciliated epaulette, ped. 
Pedicellaria. 
PLATE 17. 
Fig. 1. — Pluteus of Echinus miliaris. Dorsal view. Note green 
pigment-masses in anterior epaulettes and absence of posterior epau- 
lettes. 
Fig. 2. — E. esculentus. Dorsal view. Green pigment absent. 
Posterior epaulettes present. 
Fig. 3. — E. acutus. Dorsal view. Green pigment absent. Pos- 
terior epaulettes present. 
Fig. 4. — E. acutus ? X E. miliaris i^. Ventral view. Maternal 
characters. 
Fig. 5. — E. esculentus $ X E. miliaris J*. Doi'sal view. 
Maternal characters. 
Fig. 6. — E. miliaris ? X E. acutus (J. Dorsal view. Maternal 
characters. 
PLATE 18. 
Fig. 7. — E. miliaris? xE. acutus J. Ventral view. Paternal 
characters 
Fig, 8. — E. miliaris ? X E. esculentus J'. Dorsal view. 
M aternal characters. 
Eig_ 9 , — E. miliaris $ X E. esculentus Dorsal view. 
Paternal characters. 
