136 CRESSWELL SHEARER, WALTER DE MORGAN, H. M. FUCHS. 



epaulettes, green pigment, one right side dorsal pedicellaria, one right 

 side ventral pedicellaria, no posterior pedicellaria. 

 These characters are the same as 3. 



V. CHAEACTEKS OF THE SKELETON. 

 While we have already stated that the skeleton is extremely 

 variable, and is a doubtful index of parental influence, what evidence 

 we have been able to derive from the study of a large number of 

 larvae seems distinctly to bear out some of the more recent con- 

 tentions. While we reserve the publication of a large number of 

 figures of the skeletal apical rods, we have inserted one typical 

 example of each cross (Fig. 5). Here the evidence would seem to be 

 distinctly in favour of the dominance of one character over another, as 

 brought out by Loeb, King, and Moore (10). For, with reference to 

 Fig. 5, it will be seen that the normal apical skeleton of E. esculcntus is 



Fig. 5. — Skeletal apical rods of four-armed Plutei. 1. E. esculcntus i x E. escuhntus^ . 

 2. E. acuttts 6 X E. esculentus 9 . ^. E. miliaris S x E. esculcntus ? . 4. E. 

 acutusS xE.ncutus9. 5. E. miliaris 6 x E.acutus'i . 6. E. esculcntus i x 

 E. acutus ? . I.E. miliaris S x E. miliaris ? . 8. ^. esculcntus 6 x E. 

 miliaris 9 , 9. E. acutus i x E. miliaris 9 . 



slender, arched, and somewhat spinous, that of E. acutus is more robust 

 and bears a greater number of spinous processes, while that of E. 

 miliaris is straight and club-shaped, bearing a few blunt knobs. 



Loeb states that the spinous condition, as is exhibited for example 

 by E. esculcntus and E. acutus (Fig, 5), is dominant over the smooth, as 



