932 REPOKT OF COMMISSIOIvfER OF FISH AND FISHERIES. [54] 



EXPLANATION OF PLATE IV. 

 Fig. 3.— Ilyodrilus Perrierii. 



Fig. 3 a.' — The worm, natural size. 



3 h. — The front part of the worm, magnified. 



3 c. — The hind part of the same. 



3 d. — The cephalic ganglion. 



3 e.— The efferent duct, atrium, penis, and oviducts. 



3 /. — The penis and oviducts, more highly magnified. 



3 g. — One of the receptacles. 



3 h. — A fascicle of spines from the upper side of the body, 



3 i. — One of the spines from the lower side of the body. 



3 k. — One of the fan or comb like spines. 



