338 ERNEST CARROLL FAUST. 



Host: Ancidosa carinata Brug. 



Habitat and time of collection: Rome, Georgia, 1918. 



Flame-cell formula: a + /3 + 7 + $ = 2+2+2+2or8. 



Forked-tailed cercaria with body 0.4 mm. long by 0.19 mm. 

 wide, with tail trunk equally long and with furci about 0.26 mm. 

 long, terminating in very short spinose porcesses. Eye-spots 

 wanting. 



Acetabulum 20 /z in diameter, in posterior fourth of body; 

 oral sucker 70 jit in diameter, opening anteriad. Pharynx 30 /x 

 in trans-section; esophagus of narrow bore, opening into thin 

 glandular-walled ceca which run caudad as far as the bladder. 

 Mucin glands wanting. 



Sporocyst simple, sausage-shaped sac. 



Excretory bladder oval, depressed; collecting tubules four 

 to each side, arising simultaneously from the bladder. Flame 

 cells in four paired groups, the posterior pair being in the tail. 



Large mass of germ cells midway between acetabulum and 



bladder. 



Cercaria rhabdocaeca nov. spec. (Fig. 9.) 



Systematic position : furcocercous larva. 



Parthenita: sporocyst. 



Host : Planorbis trivolvis Say. 



Habitat and time of collection: slough, Urbana, 111., 1918. 



Flame-cell formula : a + /3 + 7 + $ + e = 2+2+2+2 + 2 



or 10. 



Forked-tailed cercaria with body 0.14 mm. long by 0.06 mm. 

 wide, with tail trunk practically twice as long, and with furci 

 0.2 mm. in length. Anterior part of body provided with thick 

 blunt spines. Acetabulum wanting; oral sucker pyriform, with 

 larger end directed inward. Eye-spots wanting. 



Sporocyst sacculate, with muscular pocket (not a digestive 

 tract) and birthpore at anterior end. 



Prepharynx present; pharynx only slightly muscular; eso- 

 phagus short and inconspicuous; cecum single median. Mucin 

 glands three to each side of the body, opening through individual 

 ducts at sides of oral aperture. Duct pores capped with hollow 

 piercing spines. 



Excretory bladder simple, with collecting tubule emerging 



