38 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 2 



The species name (denea-gland) is derived from the fact that 

 it possesses glands of Goto posterior to the testes. 



Benedenia anadenea, new species 

 (Plate 4, figs. 5-8) 



Host: Mycteroperca sp. 

 Location: Gills 



Locality: Socorro Island, Mexico 

 Number: 12 



Body elongated oval, 2.1 to 3.99 mm. in length by 1.56 to 2.16 

 mm. in greatest width. Posterior haptor circular and strongly five- 

 lobed, 0.076 to 1.12 mm. in diameter, broad unnotched marginal 

 membrane. The anterior pair of hooks 0.067 to 0.118 mm. in length, 

 straight with sharp points directed anteriorly. Middle pair of hooks 

 0.118 to 0.288 mm. in length, strong, arcuate with strongly recurved 

 points directed anteriorly. Posterior pair of hooks 0.048 mm. in 

 length, relatively slender with recurved points directed anteriorly. 

 Larval hooks 0.028 to 0.080 mm. in length. Anterior suckers ellipti- 

 cal, without marginal membrane, broader than long, 0.16 to 0.20 

 mm. in length by 0.16 to 0.27 mm. wide. Oral sucker broader than 

 long 0.18 to 0.25 mm. in length by 0.30 to 0.42 mm, in width, five- 

 lobed with slight indentations. Esophagus short, intestinal limbs 

 with lateral branches. Testes approximately in mid-body, side by 

 side and close together, smooth, unlobed, slightly longer than broad, 

 0.47 to 0.75 mm. in length by 0.50 to 0.54 mm. in width, pierced 

 by eleven to seventeen dorso-ventral muscles. Glands of Goto absent. 

 Cirrus sac bulbous, twice as long as wide, posterior to oral sucker 

 extending halfway between oral sucker and ovary. Prostate glands 

 fan-shaped opposite cirrus sac, extending nearly to lateral edges of 

 body and posteriorly over halfway from oral sucker to ovary. The 

 genital pore to left of oral sucker, anterior to anterior border of oral 

 sucker. Ovary median, partly between anterior edges of testes, 

 smooth, globular, unlobed, slightly broader than long, 0.169 to 0.254 

 mm. in length by 0.169 to 0.288 mm. in width. Seminal receptacle 

 intraovarlan. Vltellaria extend from lateral borders of anterior 

 suckers to posterior end of animal and lateral to sides. Yolk reservoir 

 not visible. Vagina not seen. Egg triangular in surface view, 0.092 



