U. S. NATIONAL MUSEUM 



PROCEEDINGS. VOL. 88 PLATE 13 



, 'f, 



145-155. Hirudinella fusca (Bosc): 145, Cross section at level of anterior border of ovar}", 

 146, cross section near posterior end; 147, section of genital papilla, from cross 

 section of neck; 148, section of base of genital papilla and anterior end of metra- 

 term, from cross section of neck; 149, ejaculatory duct, prostate, and metraterm, 

 from cross section of neck; 150, ovarv and shell gland, partly diagrammatic, 

 from cross sections; 151, ovary and dorsal wall of shell gland, from frontal 

 section; 152, ovary and dorsal portion of shell gland, from frontal section; 153, 

 ovary and shell gland, from frontal section; 154, ejaculatory duct, prostate, and 

 metraterm, from cross section of neck; 155, cuticle, from cross section. (138, 

 139, and 151-153 from Xiphias gladius, 140, 141, and 145-150 from Trichiurus 

 lepturus, 154 and 155 from Thunnus secundodorsalis.) 



156, 157. Immature distomes referred provisional!}^ to H. fusca: 156, Fragments from 

 Pterophryne histrio; 157, from Trachurops crumenophthalma. 



