342 C’KESSWKLL SHEAUKli, WAI/J'EK DE iMOKUAX, H. AI. EUCHS. 
varies within wide limits. The larva (PI. 17, fig. 2) has a body 
which is deeper than wide, the posterior pole being flattened. 
As soon as the eight arms are developed the ciliated band 
around the anterior edge of the larva thickens, four crescentic 
bands being abstricted. These are the anterior epaulettes, 
and by means of their strong cilia they form the principal 
Text-fig. 3. 
Diagram to show the inheritance of the late larval characters in 
hybrids between E. miliaris and E. acntns during 19T2 
(cf . Text-fig. 2) and absence of the green pigment -masses in 
the hybrids when E. miliaris was maternal, ii.cil.cp. Pos- 
terior ciliated epaulette. 
locomotory organ of the fully formed phi tens. Eventually 
they coalesce to form one continuous band. At the end of 
about three weeks a pair of posterior ciliated epaulettes is 
formed. The presence of these structures in this species is one 
of the characters of which we have investigated the inheritance 
('I'ext-fig. 1). A pair of pedicellarim appear dorsally and 
ventrally on the right side of the larva, opposite to the Echinus- 
rudiment, which is now well advanced. A posterior pedicel- 
laria is usually present as well. It is also developed in E. 
