96 CH. WARDELL STILES AND ALBERT HASSALL 



Immature Fasciolinae (exclusive of tlie stages Miracidium, 

 Sporocyst, Redia, Cercaria) in which the organs do not 

 permit of a détermination of tiie genus. Agamodistomum. 

 2a. Body divided into an anterior cylindrical portion witii 

 pedunculate acetabukim, and a posterior portion curiously 

 curled so as to resemble an armed chair ; found in Fish. 



Type : 0. torosum Otiotrema. 



Body not so divided 3. 



3. Génital pore w^ith contiguous maie and female openings 4. 

 Maie génital opening halfway betv\^een acetabulum and poste- 

 rior extremity, (cirrus absent ?); vulva anterior of acetab- 

 ulum ; intestine branches immediately from pharyngeal 

 bulb (oesophag.us absent). — Type : Bracliylaima advena 

 Dujardin, 1843 Braclujlaima. 



4 . Génital pore anterior or antero-lateral of oral sucker. — 



Type : CephalogonimusLenoiriPoirier.iSSQ. Cephalogonimus. 



Génital pore posterior of oral sucker, but anterior of acetab- 

 ulum (médian, or right or left of médian Une, ormarginal), 

 or latéral of acetabulum 5. 



Génital pore posterior of acetabulum : About halfway be- 

 tween acetabulum and posterior extremity (type: Clinosto- 

 mum gracile Leidy), orimmediately posterior of acetabulum 

 Rs in Distomum WestermanniKerhert. . . Clinostomum. 



Génital pore at posterior extremity. — Type : Fasciolamacro- 



sîoma Rudolphi Urogonvmus. 



3 . Anterior extremity provided w^ith cylindrical retractile acu- 

 leate tentacles. — Type : Distoma coronatum Rudolphi 



Rhopalias. 



" Anterior extremity without retractile aculeate tentacles 6. 



6. Oral sucker provided with a crown of spines inserted direc- 



tly, or upon a reniform membrane surrounding the mou th. 



— Type : Distoma echinatum Zeder .... Echinostoma. 

 Oral sucker provided with fleshy lobes. — Type : Distoma 



nodulcsum Bunodera. 



Oral sucker without crown of spines or fleshy lobes of oral 

 sucker 7 



7. Body with retractile caudal appendage; oesophagus présent. 



— Type : Fasciola appendiculata Rudolphi . . Hemiurus. 



