132 PLANAR1A VELOX. 



consisting, in the different animals, of from 

 one to sixteen; but their origin and progress 

 were not observed, and as all are not pro- 

 duced at once, I cannot affirm how many 

 are peculiar to the species. A planaria se- 

 parated from others on the second of Octo- 

 ber, had next day laid twelve eggs, while 

 one remained in the body some time 

 longer. These eggs are of a dark brown 

 colour, and perfectly spherical ; those of the 

 former species are of a long ovoid, and of a 

 clear, transparent, reddish brown : they are 

 attached in a cluster either to the sides of 

 the vessel, or to any floating substance in 

 the vicinity. Probably weeks are required 

 for their exclusion. Such seemed the result 

 of observations made in November, when I 

 found the shell broke, and the young that 

 had escaped. 



Minute crimson specks were perceptible 

 in one of the parent planarise, and having 

 previously remarked the same appearance 

 in several individuals, I was induced to con- 

 sider them the incipient evolution of an ova- 



