244 THE AMERICAN NATURALIST [Vol. LV 



that the eggs in one end of the nidosomic belt, and in the 

 main part of it, were all fertilized, while the other end 

 (the last end) of the belt showed lack of fertilization. 

 Another fact noted is that Melibe leonina carries over 

 spermatozoa in its genital vessels; that more than one 

 egg-body is deposited after insemination. 



Reid's observations, 1846, on Doris bila mrllahi , l>. 

 tuhrrriilafa, GoyiuJor'is harricnisis, Pohf' ' ni >iinu],i- 

 rnirala. I)> tub <nini h.< nrhorrsmi^, Dolo ,<nn>nita. and a 



however, appear to be absolutely necessary for the 

 production of fertile ova in all, if in any of the individuals 

 of the nudibrancliiate Mollusca, that coitus should have 

 so shortly ])i-t'(MMl("(l spawning as was observed in Poly- 

 cera. for- an Iloli- which was kept strictly eoiiliiUMl in a 

 vesM-1 l.> \\^v\\\ .1. ■posited, on the tenth and ayaiii on the 

 tliir!>-->.cMn(l (la\ of its isohition, abundance of fertile 

 ova." Cfo/irr. HMD. claims that the lai-vr animals of 



in a -ivrn tinn- than do small ones: that it is conse- 

 (luently of advantage to the species that large individuals 



