No. 5 meserve: monogenetic trematodes 37 



0.237 mm. in length, relatively long and strong, sharp recurved points 

 projecting anteriorly at the two indentations in posterior border of 

 haptor. Posterior pair of hooks 0.050 to 0.084 mm. in length, straight 

 except at very fine recurved tips. Larval hooks present 0.040 mm. 

 in length. Anterior suckers elliptical, without marginal membrane, 

 broader than long, 0.101 to 0.185 mm. in length by 0.117 to 0.254 

 mm. in width. Oral sucker broader than long, 0.169 to 0.332 mm. in 

 length by 0.204 to 0.390 mm. in width, deeply five-lobed. Esophagus 

 short, intestinal limbs with lateral branches. Testes approximately 

 in mid-body, side by side and close together, smooth, unlobed, 

 slightly longer than broad, 0.339 to 0.661 mm. in length by 0.288 

 to 0.491 mm, in width, pierced by twelve to seventeen dorso-ventral 

 muscles. Posterior to testes are two kidney-bean shaped glands of 

 Goto, broader than long, 0.03 mm. in length by 0.118 mm. in width, 

 concave borders anterior and of same contour as posterior border of 

 testes. The cirrus sac extends less than 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 and an- 

 terior to anterior border of oral sucker. Ovary median, partly pre- 

 testicular, partly between anterior edges of testes, smooth, globular, 

 unlobed, 0.152 to 0.305 mm. in length by 0.169 to 0.322 in width. 

 Seminal receptacle intraovarian. Vitellaria coarsely acinous extend- 

 ing from anterior suckers to posterior end and lateral to the sides. 

 Yolk reservoir just anterior to ovary, one and one-half times the 

 width of the ovary, over twice as wide as long and receives vitelline 

 ducts from its lateral, anterior, and posterior borders. Vagina not 

 seen. Egg triangular in outline appearing pyramidal from the ventral 

 side. 0.092 mm. in length by 0.125 mm. in width, polar filament and 

 appendage absent, lower border has thick ridge of shell material 

 which also extends up middle of ventral side over halfway to an- 

 terior end of egg. 



B. adenea is most similar to B. isabellae but differs in possessing 

 smooth testes, more elongated glands of Goto, smaller size, more 

 anterior genital pore, and more spherical ovary. It differs from B. 

 ovata in possessing elongated glands of Goto and differently shaped 

 hooks. B. xshxkawae differs in lacking glands of Goto. 



