l88 ANDREWS. [Vol. VII. 



This, however, suggests a connection of retinal cells and gan- 

 glion cells like that observed by Jourdan in Eunice. 



Sections of one female specimen show the same structure as 

 that found in the male. A single non-sexual form bearing three 

 males, one nearly perfect, also presents the same structure, 

 though the eyes are smaller. 



Sections of two adult male A. longisitosus Ver. reveal eyes 

 that are even larger than those of the male A. prolifer, but with 

 identity in structure. No connection of lens and cuticle was 

 actually observed in this limited material. 



Proccerea tardigrada Webster} 



The non-sexual forms of this brightly banded annelid occur 

 amongst the hydroids upon the wharves, late in the summer, 

 while the sexual forms are sometimes taken in the surface net. 



In the non-sexual form, the four eyes are all dorsal, the anterior 

 pair much the larger. Surface views demonstrate that the pig- 

 mented retinas are sunk beneath the cuticle, and that a large 

 conical part of the lens projects from this pigment towards the 

 cuticle, with which it is connected by a slender stalk. This 

 protuberant part of the lens is surrounded by clear, epidermal 

 cells, and is marked by few longitudinal lines, as though it were 

 made up of a few pyramidal masses applied together. 



This connection of lens and cuticle is also seen in sections. 



When macerated, the lens is plainly bilobed (Fig. 42), the 

 constriction being embraced by the edges of the optic cup. 



The retina has the same structure as in Autolytus. The 

 isolated pigment granules are large, yellow-red spherules ad- 

 hering to and contained within the cells : only the nucleus may 

 remain free from pigment. 



In the adult female with blue eggs, or larvae carried in the 

 ventral sac, the eyes have the same structure as in the non- 

 sexual form, though the position is as shown in the male Auto- 

 lytus (Fig. 39). In section the connection of lens and cuticle 

 by a slender cylindrical stalk was well shown, as indicated in 

 the simplified drawing (Fig. 41). 



^ This annelid I regard as the same as P. ornata of Verrill. 



