NO. 14 MANTER : DIGENETIC TREMATODES OF FISHES 435 



than twice as big. A. trachinoti seems to be most similar to A. laguncula, 

 but the eggs are not nearly so wide and have a different shape, and the 

 pars prostatica is somewhat longer and curved. A. rhinoplagusiae has a 

 larger seminal receptacle, 1 :3 sucker ratio, larger eggs, and longer ceca. 

 A. brevicaudatus remains distinct in posterior ovary and vitellaria and in 

 position of genital pore. A. intermedius has different eggs, more spherical 

 sinus sac, and more symmetrically placed testes. 



A. vitellograndis Layman, 1930 needs a more complete description. 

 Because an ecsoma was figured and described, the species was considered 

 in the genus Sterrhurus by Manter (1934). Yamaguti has collected it 

 and reports an ecsoma lacking. He states it belongs in the genus Apo- 

 nurus. A. trachinoti differs from it in the same way as from A. laguncula. 

 Layman figures the vitellaria of A. vitellograndis as pointed medianly, 

 more as in Lecithaster. The shape and size of the vitellaria seem to be the 

 only differences between A. laguncula and A. vitellograndis. The two 

 species should be compared more fully. 



Leurodera pacifica, new species 

 (Plate49,figs. 126, 127) 



Hosts: Anisotremus interruptus (Gill) 



Anisotremus scapularis (Tschudi) 



Location: Stomach 



Locality: Galapagos Islands (Albemarle, James, Charles is- 

 lands) 

 Number : From one to 5 specimens in each of 4 hosts 



SPECIFIC DIAGNOSIS OF LEURODERA PACIFICA 



Body tongue shaped, somewhat flattened, broadest near posterior end, 

 length 1.215 to 2.632, greatest width 0.513 to 1.012. Forebody tapering, 

 0.540 to 1.013; posterior end of body broadly rounded. Oral sucker 

 0.157 to 0.280, subcircular, subterminal. Acetabulum at or slightly pos- 

 terior to midbody, 0.337 to 0.637 in diameter, aperture circular. Sucker 

 ratio approximately 1:2 or 2:5. Pharynx 0.102 to 0.153 in length by 

 0.078 to 0.133 in width; esophagus very short (often not evident) ; ceca 

 more or less undulating, extending to posterior end of body, bowing out- 

 ward near acetabulum, inward at testicular level and again outward near 

 widest portion of body, bending medianly toward one another near pos- 

 terior end. A pair of conspicuous muscle bands extends from sides of 

 pharynx diagonally outward and backward. Another shorter pair extends 



