[47] REPORT OP COMMISSIONER OF FISH AND FISHERIES. 925 



EXPLANATION OF THE REFERENCE LETTERS USED IN THE PLATES. 



afr. — Atrium. 

 eff. — Etiereiit duct. 

 ('/. /.—Efferent funnel. 



p. — Penis. 

 J). 8. —Penis slieatb. 

 ex. ovd. — Exterior oviduct. 

 in. ocd. — Interior oviduct. 

 in. ajH. — Interior aperture. 

 ex. apt. — Exterior aperture. 

 sp. mscl. — Spiral muscles. 

 2)r. — Prostate glands. 

 sj). — Spines. 

 ('. V. — Ventral vessels. 

 d. V. — Dorsal vessel. 

 n. s. — Natural size. 

 h. mgfd. — Highly magnified. 

 ovd. — Oviduct. 

 s. he. — Buccale segment. 

 I. cep. — Cephalic lobe. 



/.—The first fissure between the penis and the penis aheath. 



