166 



H. M. FUCHS. 



pigment is scattered on the surface in small chromatophores, which are 

 concentrated below the trochal ring and round the mouth. Fig. 2 



Fig. 1. — Larva of Nejjhthys. 6 days. 

 From the ventral aspect. 



shows a later stage, the general shape of the larva being the same as 

 before. The alimentary canal is divided into stomach and intestine, 

 and there is an anal patch of cilia. Fig. 3 shows a trochophore of four- 



Fio. 3.— Larva of Nephthys. 14 days. 



From the ventral aspect, hr. p. — Brown pigment. (/. (jr. ;).— Dark green pigment. 



int. — Intestine. I. gr. p. — Light green pigment, st. — Stomach, 



