940 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [62] 



EXPLANATION OF PLATE VIIL 

 Fig. 6. — Hemitubifex insignis. 



Fig. 6 g. — The cephalic ganglion. 



6 h. — One of the spermatophores. 



Fig. 7. — Tubifex campanulatus. 



Fig. 7 a. — The cephalic ganglion. 



7 b. — One of the spines. 



7 c, — Efferent duct, atrium, prostata, penis, penis sheath, and oviducts. 

 7 d. — One of the receptacles. 



