936 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [581 



EXPLANATION OF PLATE VI. 

 Fig. 5.— Ilyodrilus sodalis. 



Fig. 5 a. — The worm, natural size. 

 5 6. — The cephalic ganglion. 

 5 c. — The front end of one of the forked spines. 

 5 d. — The same spine, whole. 



5 e.— The front end of one of the spines, which occurs together with the hair- 

 spines. It shows the beginning of a comblike structure. 

 5/. — The same spine, whole. 

 5 (/.—The efferent duct, atrium, prostata, penis, and oviduct. In the latter are 



seen numerous spicula. 

 5 /).— One of the receptacles. At its base is seen an accessory gland. 

 5 i. — One of the ovaries. 



