428 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 2 



hermaphroditicus is very wide and more muscular. Its eggs are smaller 

 and wider, and the cell pad around the presomatic pit is much better 

 developed. L. synodi does not seem to possess the sphincter of the metra- 

 term described for L. microstomum and L. japonicum. 



Lecithochirium magnaporum, new species 

 (Plate47, figs. 114-116) 



Hosts: Paralabrax humeralis (Cuv. and Val.) 

 Euthynnus alletterata (Raf.) 

 Seriola dorsalis (Gill) 

 Epinephelus sp. ? 



Location: Stomach 



Locality: Galapagos Islands (Charles Island, Albemarle Is- 

 land, Hood Island) 



Number: 20 specimens were collected from 5 hosts. A single 

 specimen in Seriola dorsalis^ in Epinephelus ( ?), and 

 in one Paralabrax humeralis. In the other 2 collec- 

 tions the trematode occurred with Lecithochirium 

 microstomum. 6 specimens were collected from one 

 Paralabrax humeralis and 11 specimens from Eu- 

 thynnus alletterata. 



SPECIFIC DIAGNOSIS OF LECITHOCHIRIUM MAGNAPORUM 



Length 1.404 to 1.728; greatest width 0.337 to 0.450. Oral sucker 

 0.135 to 0.150 in diameter; acetabulum 0.262 to 0.292 in diameter; 

 sucker ratio approximately 1 :2, or acetabulum may be slightly less than 

 twice diameter of oral sucker. Forebody 0.240 to 0.420. Ecsoma almost 

 always completely retracted. Pharynx usually slightly wider than long; 

 0.054 to 0.075 in length, 0.063 to 0.073 in width; esophagus very short; 

 ceca usually not entering ecsoma. Presomatic pit muscular, its aperture 

 a transverse slit. Genital pore opposite base of pharynx, large, conspicu- 

 ous; with a narrow transverse slit similar to aperture of pit; provided 

 with conspicuous radial muscles. Testes diagonally oblique, just poste- 

 rior to acetabulum. Seminal vesicle tripartite, overlapping acetabulum. 

 Prostatic cells surrounding male tube (pars prostatica) just before it 

 enters sinus sac. Sinus sac thin walled, very large, wider than long, 0.060 

 to 0.102 in length, 0.094 to 0.153 in width. Prostatic vesicle pyriform, 

 entirely inside sinus sac. Ovary transversely extended. Vitelline lobes 

 digitiform. Uterus may, but usually does not, enter ecsoma. Eggs tapering 

 somewhat toward each end but more abruptly toward one end so that 

 they are widest toward one end of the middle; size 15 to 19 by 8 to 9 /x. 



