ON THE ANGUILLULID^. 95 



** Integument with transverse stria or dots. (Esophageal ring absent. 

 t Ocelli absent. 



X Uterus unsymmetrical. 



<^'22. Tachyhodites. Pharyngeal cavity absent. 71m;o peculiar colourless bodies on dorsal surface near 

 anterior extremity. Vaginal glands wanting. Accessory pieces recurved. 



''23. Theristus. Pharyngeal cavity hemispherical. Vaginal glands two, unequal. Accessory pieces 

 recurved. 



24. Sph^rolaimus. Pharyngeal cavity large, somewhat spherical. (Esophageal canal bounded by 



three longitudinal bands. Vaginal gland single, posterior. Spicules long, narrow, with a single 

 posterior shield- shaped accessory piece. 



%X Uterus symmetrical. 



25. CoMESOMA, Integument having lateral circular depressions near head. Pharijngeal cavity very 



small. Spicules long, narrow, with or without a very small posterior accessory piece. 



26. Spira. Integument having lateral, convex, circular prominences near head. Pharyngeal cavity none. 



(Esophagus having a slight rounded swelling posteriorly. Spicules stout, curved, with two accessory 

 pieces. 



27. Odontobius. Pharyngeal cavity none. Teeth doubtful. Spicules stout, curved, with two acces- 



sory pieces. 



tt Ocelli present or absent. 



28. Cyatiiolaimus. Integument with transverse striae or rows of dots. Pharyngeal cavity cup- 



shaped, with longitudinal markings. (Esophagus cylindrical. Accessory pieces strong, four, in two 

 pairs. Caudal sucker elongated, cylindrical. 



29. Spilophora. Integument with transverse rows of dots or striae. Pharyngeal cavity cup-shaped, 



with longitudinal markings, and three processes extending backwards. Accessory pieces two, 

 rather indistinct. Caudal sucker elongated, cylindrical. (Esophagus having well-marked swelling 

 posteriorly. 



30. Chromadora. Integument with transverse and longitudinal striae. Pharyngeal cavity rather in- 



distinct, three cuneiform processes extending backwards and in contact. Accessory pieces two, 

 strong, hooked. Caudal sucker elongated, pointed. 



GENERA WHOSE CHARACTERS ARE INSUFFICIENTLY KNOWN. 



31. Amblyuba, Hemprich and Ehrenberg. 



32. Hemipsilus, Quatrefages. 



33. Phanoglene, Nordmann. 



34. Pontonema, Leidy. 



35. PoTAMONEMA, Leidy. 



36. Nema, Leidy. 



37. Urolabes, Carter. 



