94 MR. H. CHARLTON BASTIAN'S MONOGRAPH 



ft Caudal sucker absent. 



"11. Cephalobus. Strke well marked. Head slightly bilobed. Pharyngeal cavity none, or small. 

 OLsophayus having rounded swelling posteriorly, containing a simple valvular apparatus. Ventral 

 gland-opening opposite posterior 2}art of oesophagus. Uterus unsymmetrical. 



Males having caudal alee, 

 ="12. Tylelenchus. ,S/;ea?' with trilobed base. ffi«o^/<«'^MS having a rounded muscular swelling about 

 its middle. Ventral gland-opening opposite posterior part of oesophagus. Uterus unsymmetrical. 

 Caudal alee narrow, unsupported. 

 1,3. Rhabditis. tS/ri* transverse and longitudinal. Pharyngeal cavity cyVmdnca.]. Oesophagus having 

 elongated swelling at middle, with rounded one at termination, containing a simple valvular ap- 

 paratus. Uterus symmetrical. Caudal alee large, supported by rays. 



II. MARINE. 



Spicules two, equal, solitary, or with one, two, or four accessory pieces. Occasionally a single sup- 

 plemental organ in ventral region, above anus. Ventral excretory gland present in allQ). Caudal 

 sucker universal. 



* Integument plain, or with longitudinal markings. QSsophagus embraced by glandular (?) ring. 

 t Spicules solitary, or with a single posterior median piece. 



14. Symplocostoma. Pharyngeal cavity elongated, oval, complex, crossed by lines or bars, and having 



a funnel-shaped body on its inferior aspect. Ocelli present or absent. Spicules long, sohtary. 



15. Oncholaimus. Pharyngeal cavity large, oval, provided with three tooth-like projections. Ocelli 



none(?). Uterus symmetrical or unsymmetrical. Spicules solitary, or with a single accessory 

 piece. 



16. Enchelidium. Pharyngeal cavity none(?). Ocellus mostly large and single. Spicules long, 



narrow, with or without a single median accessory portion. 



''17. Anticoma. Integument having a row of opposite setfc on dorsal and ventral surfaces. Ocelli 

 none. Vaginal glands two, equal. Spicules solitary. Sujjplementary organ small. 



•"IS. Phanoderma. Pharyngeal cavity small. Ocelli distinct, lateral. Spicules long, solitary. Sup- 

 plementary organ small. 



ft Spicules having two equal accessory pieces. 



^\9. Leptosomatum. Pharyngeal cavity none. Ocelli distinct, dorsal, occasionally coalescing. Ex- 



cretory glandular organs two, lateral, opening on either side of head. Sujjplementary organ a 



small sucker-like prominence. 

 ''20. Enoplus. Pharyngeal cavity indistinct, surrounded by three separate teeth or jaws. Ocelli not 



distinct from surrounding pigment. No oesophageal ring, and integument vnth delicate transverse 



as well as longitudinal strice. 



<=21. LiNHOMOMius. Pharyngeal cavity cup-shaped. (Esophagus enlarged behind pharynx and also 

 at posterior extremity. Oesophageal ring (?). Anal glands large. Accessory pieces recurved. 



" All the animals belonging to the genera having this mark afBxed to them have a modification of the ventral 

 gland, and are endowed with a remarkable tenacity of life. 



•> The species belonging to the genera having this mark affixed to them are all distinguished by the males being 

 provided with a supplementary organ. 



•^ The males of the species belonging to these three genera present the common character of reflexed accessory pieces. 



