BIHAN(3 TILL K. SV. VET.-AKAI). HANDL. BAND 18. AFJ). IV. N:0 1. 11 



been reabsorbed. Then the period of lioating at the snrface 

 of the sea is nearly at its end, and the yonng Echinus is going* 

 to sink to the bottom and thns begin its creeping life. 



0^-69 





1. Yonug Echinid. veiitral wide. 2*. Pcdiccllar poic. ;>. Podicel. 4. Solitary sucker. 



BuRY has described the same stage in the Echinus parvi- 

 tuberculatus, Blv.. and given a iignre of its dorsal aspect in 

 the living state.' 



The general form is lenticular. Invested all around with 

 the continuons, smooth, pigmented larval covering, - it has Jio 

 mouth and no excretory opening, and is without gills. Near 

 the periphery, on the ventral side, the integuments are pro- 



' Quarterly Journal of Microscopical Science, Xew Series. XXIX, p. 440, 

 Pl. XXXVIII, iig. 11 



^ See Pourtalesia, p. 27, Pl. XIX, iig. 232, ventral view, 233 dorsal view. 



