334 
G. DEBAISIEUX. 
Morgan, T. H. (1895). — •“ The Fertilisation of Non-nucleated Fragments 
of Echinoderm Eggs,” ‘ Arch. f. Entw. Mech.,’ Bd. ii. 
Seeliger, O. (1894). — “ Giebt es geschlechtlich erzeugte Organismen 
ohne mhtterliche Eigenschaften .® ” ‘Arch. f. Entw. Mech.,’ Bd. i. 
Shearer, De Morgan and Fuchs (1911). — “Preliminary Notice on the 
Experimental Hybridisation of Echinoids,” ‘ Journ. of the Mar. 
Biolog. Assoc.,’ vol. ix. 
— (1912). — “ Inheritance of Paternal Characters in 
Echinoids,” ‘ Nature,’ vol. Ixxxix. 
Steinbriick, H. (1902). — “ IJeber Bastardierimg zwischen Strongylocen- ‘ 
trotus nnd Sphserechinns,” ‘ Arch. f. Entw. Mech.,’ Bd. xiv. 
Tennent, D. H. (1910). — “ The Dominance of Matenial or of Paternal 
characters in Echinoderm Hybrids,” ‘Arch. f. Entw. Mech.,’ Bd. 
xxix. 
Vernon, H. M. (1898). — “ The Relations between the Hybrid and Parent 
Formsin Echinoderm Hybrids,” ‘ Philos. Trans.,’ series B, vol. cxc. 
(1900).— “ Cross-fertilisation among Echinoids.” ‘Arch. f. Entw. 
Mech.,’ Bd. ix. 
EXPLANATION OF PLATE 16, 
Illustrating the paper by Dr. G. Debaisieux on ‘‘The Experi- 
mental Hybridisation of Echinus miliaris, Echinus 
esculentuSj and Echinus acutus.’^ 
List of Abbreviations employed. 
ant. ep. Anterior ciliated epaulette. ech. “Echinus rudiment." 
gr. pig. Green pigment. 1. ped. Lateral pedicellana. post. ep. Pos- 
terior ciliated epaulette, p. ped. Posterior pedicelliaria. sp. Adult 
spine. 
[N.B. — Only the green pigment is indicated in the drawings ; the red 
pigment, which is present in all the larvae figured, is left out.] 
Figs. 1-2. — Pluteus of Ech inus miliaris x E. miliaris viewed from 
the ventral surface. Gr.pig. The green pigment. 
Fig. 3. — Pluteus of E . esculentus X E. esculentus viewed fi-om 
the right side. After the drawings of Mr. MacBride. 
Fig. 4. — Hybrid pluteus of E . miliaris? X E. esculentus c?, from 
