ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



277 



4 figs.). The ciliated crown is traced back to a girdle of sixteen cells, 

 exclusively derived from the four trochoblasts that appear at the 

 equator of the blastoderm. The four cells known as intermediary do 



J. A. T. 



not share in forming the ciliated crown. 



Larva of Ophryotrocha puerilis. — A. D. Peacock {Report Dove 

 Marine Laboratory, Gullercoats, 11)20, 9, 95-96, 3 figs.). Notes on 

 larvfe with one to six segments behind the head. The larva moves 

 forward and rotates on its long axis. The eyes by reflected sunlight 



Ventral aspect of larva of Ophryotrocha •puerilis, 

 with three segments posterior to the head. 



are red. The cilia of the anterior and posterior bands are strong, 

 coarse and long, but those of the middle band and those in the regions 

 of the mouth, anus and posterior segment are much finer. The 

 incipient stages of parapodia and cirri were noticed. J. A. T. 



