344 CUESSWELTi SHEAREIf, WALTER DE MORCxAN, H. M. FUCHS. 
acutus, but is never present in E . m iliaris. The inheritance 
of this pedicellaria follows that of the epaulettes, but it is not 
a very reliable feature, as it occasionally fails to develop in pure 
E. 'esculentus, E. acutus, or the hybrids. The larva is 
studded with reddish-brown pigment spots, which are concen- 
trated at the tips of the arms and along the ciliated epaulettes. 
The pluteus of E. acutus (PI. 17, fig. 3, and right upper 
figure in Text-fig. 2) closely resembles that of E. escu- 
lentus, and develops posterior epaulettes. It has, how- 
ever, a rather smaller body, with more slender and divergent 
arms. Owing to the similarity in essential features between 
this species and E. esculentus, hybrids between them give 
no information of hereditary value. 
The E. miliaris larva (PI. 17, fig. 1, and Text fig. 1) is of a 
different general shape from the two described above, tlie body 
being wider and having a domed posterior end. The arms are 
comparatively short. A dorsal and a ventral pair of green 
pigment-masses are developed in the anterior epaulettes. This 
pigment is completely absent in the plutei of E. esculentus 
and E. acutus. No posterior epaulettes are developed in 
E. miliaris. The presence of the green pigment and the 
absence of the posterior epaulettes are the important features 
of this larva for the study of heredity (Text-fig. 1). 
This year (Text-fig. 3), as in previous seasons (Text-fig. 2), 
hybrids of the cross E. acutus ? X E. miliaris (Eh 17, 
fig. 4) have developed maternal characters. The posterior 
epaulettes are present, and there is no trace of the green 
pigment-masses. 
Plutei of the cross E. esculentus ? x E. miliaris 
(PI. 17, fig. 5) have similarly always been purely maternal 
with respect to the same characters. In one experiment, 
however, all the larvae had the usual material absence of 
green pigment, but some developed both posterior epaulettes, 
some neither and others had one on one side of the body 
only (Text-fig. 4). 
With the cross E. miliaris ? x E. acutus c? we have, 
however, obtained totally different results this season from 
