400 



FRESH-WATER BIOLOGY 



116 (119) Vitellaria confined to extreme anterior region of body, not ex- 



tending posteriad further than acetabulum 117 



117 (118) Vitellaria extend across entire body in anterior region, reaching 



nearly to acetabulum. 

 Genital pore on ventral surface. 



Subfamily BRACHYCOELIINAE Looss 1899. 



Intestinal crura short, not extending posteriad to acetabulum. Genital pore median, between 

 suckers. Testes lateral, near acetabulum. Ovary lateral, pretesticular. Uterine coils fill 

 entire posterior region. Eggs numerous, small. 



A single species Brachycoelium hospitale Stafford 1903 is recorded from North America. 



Genital pore marginal. 



Subfamily PLEUROGENETINAE Looss 1899. 



Intestinal crura of variable length. Genital pore sinistral, often marginal. Cirrus sac 

 large, pyriform, with coiled vesicula seminalis and muscular cirrus. Eggs 23 to 40 fj. long. 

 Intestines of Anura; a single species in Chamdion. 



The family description as written by Odhner will not take in the American genus which 

 Looss and he think should certainly be included here. Until more data are available it is 

 unwise to make a new place for this single genus. 



Only North American genus yet described. 



Loxogenes Stafford 1905. 



Small distomes, with broad, thick, heart-shaped body in- 

 dented at posterior end. Skin spinous. Suckers small, poorly 

 developed, nearly equal; acetabulum near center of body. 

 Pharynx present; esophagus very short; crura short, some- 

 what inflated, not reaching even to center of body. Excretory 

 vesicle divides near pore, lateral branches inflated, terminat- 

 ing behind testes. Ovary pyramidal, lobed, preacetabular, 

 between testes, slightly dextral. Vitellaria ventral, extend 

 across entire body from pharynx nearly to acetabulum. 

 Laurer's canal and small receptaculum present. Uterus 

 chiefly postacetabular, with longitudinal folds in two groups 

 one on each side of body. Testes oval, small, lateral at ends 

 of crura, in line with acetabulum or slightly posterior. Cir- 

 rus sac long and narrow, preacetabular, sinistral, with coiled 

 cirrus. Sexual pore dorsal, sinistral, midway between center 

 and margin at level of fork in intestine. Ova small, 24 by 

 14 /i, numerous. 



In thick-walled closed cysts on pylorus, liver, and bladder 

 of various frogs. The single species L. arcanum (Nickerson) is encysted in pairs. Massachu- 

 setts, Minnesota, Ontario. 



118 (117) VitelJaria consist of small groups of follicles lateral to pharynx hi 



extreme anterior region. 



Caecincola Marshall and Gilbert 1905. 



Very small distomes; anterior end truncate, posterior end bluntly 

 rounded. Entire body spinous. Oral sucker very large, acetabulum 

 much smaller. Mouth terminal, prepharynx and esophagus equal, rather 

 long, pharynx prominent, ceca short but wide. Excretory vesicle Y- 

 shaped, extending anteriad beyond pharynx. Testes very large, ovoid, 

 in posterior half; no copulatory organs; seminal vesicle large, bipartite. 

 Ovary lobed, anterior to right testis; vitellaria scanty, far anterior, lateral 

 to pharynx. Uterus poorly developed, a few open loops, above and be- 

 hind testes, extending nearly to posterior end of body. Receptaculum 

 seminis dorsal to ovary. Assigned by some to the family Acanthochas- 

 midae; see note under 82 (75) in this key. 



Type species. 



Caecincola parvulus Marshall and Gilbert 1905. 



One species known (C. parvulus) in ceca and stomach of large-mouthed 

 black bass in Wisconsin. 



FIG. 604. Caecincola parvulus. Ventral view; ovary drawn somewhat to one 

 side to show underlying parts. X 95- (After Marshall and Gilbert.) 



119(116) Vitellaria not confined to extreme anterior region 120 



FIG. 693. Loxogenes arcanum 

 Dorsal view. X 10. (After Os- 

 born.) 



