ON THE EXPERIMENTAL HYBRIDIZATION OF ECHINOIDS. 



301 



while that of E. miliaris is from April to September. When these forms are crossed 

 early in May, the characters of the larval skeleton are exactly similar to those 

 obtained when the same cross is made late in August. The resulting type of 

 skeleton is always the same throughout the season. In text-figs. 8 and 9 a 

 considerable number of the figures are taken from larvte obtained either early or 

 late in the breeding season, but it will be seen that they all conform to much the 

 same general type. This applies equally to all the other larval features, as 

 epaulettes, pedicellarise, green pigment, etc. 



Table to show the Inheritance of the Characters of the Aboral Ends of the 

 Skeleton-rods in tlie Larval Hybrids between E. esculentus (E.), E. acutus (A.), 

 and E. miliaris (M.). 



M. and A. 



9. Inheritance of the Late Larval Characters ix 1909-11. 



The table given at the close of Section 6 shows that the late larval characters, of 



which the inheritance has been investigated, are the same in E. esculentus as in 



E. amtus, but are different in E. milians. The consequence of this is that hybrids 



between E. esculeiitus and E. acutus give no indications as to the inheritance of 



