THE BRISTLE- WORMS. 103 



Worms with leafy plates ^l ( Head with four ten ' 



taeles - I tacles Eulalia. 



CHARACTERS OF SPECIES. 

 Fam. Aphroditidse. 



Polynoe. P. imbricata has fifteen pairs of scales, which fall off very 

 readily. The projecting bristles have a length equal to half 

 the width of the body. 



Aphrodite. A. aculeata has fifteen pairs of scales beneath the felt 

 of bristles. There is a small median tentacle and two long 

 palps on the head. The body tapers posteriorly. 



Sihenelais. In S. boa the head has three tentacles, a pair of long 

 palps, and four eyes. The first segment bears three pairs of 

 cirri. 



Fam. Phyllodocidse. 



Phyllodoce. In P. maculata the body is very slender, the dorsal 

 plates are rounded. In P. lamelligera the body is broad and 

 massive, and the dorsal plates are oval or heart-shaped. 



Eulalia. In E. viridis the body is bright green, and the dorsal 

 plates are narrow and pointed. 



All the worms mentioned in the chapter are widely distributed 

 throughout the British area. 



