96 ASCAKOIDEA 



12. Bolbinium Cobb, 1920. 



Cuticle finely striated, without bristles or lateral alae. 

 Head not distinct, without lips or bristles, but with six 

 papillae. Lateral organs large, deeply placed. Oesophagus 

 with a pyriform posterior swelling. Tail of male short and 

 rounded. A vestigial spicule.* No accessory piece or sup- 

 plementary organs. Caudal glands and spinneret absent. 

 Female unknown. 



Hab. Soil. 



Genotype : B. brevicolle Cobb, 1920. 



Cobb, 1920, Contr. Sci. Nematol, ix, 240 and key; Mico- 

 letzky, 1922, Arch. f. Natitrg., Abt. A, Ixxxvii, 161. 



13. Cyartonema Cobb, 1920. 



Cuticle finely striated, without bristles except for a few 

 on the tail. Slight lateral alae present. Head with four 

 bristles and six minute papillae. Lateral organs large and 

 circular. Oesophagus narrow, expanding gradually behind. 

 Caudal end of male without supplementary organs. An 

 accessory piece present, with a long posterior process. Testis 

 single, anterior, outstretched. Caudal glands and spinneret 

 present. 



Hab. Marine (in sand). 

 GenotyiDC : C. flexile Cobb, 1920. 



Cobb, 1920, Contr. Sci. Nematol., ix, 242 and key. 



14. Tripyla Bastian, 1865. 



Syn. Tripida Bast., 1865 ; Trischistoma Cobb, 1913. 



Cuticle striated or occasionally smooth, without bristles. 

 Head not distinct, with three lips and with papiUae and 

 bristles, or bristle-like papillae. Lateral organs apparently 

 absent. Oesophagus slightly swollen posteriorly. Caudal 

 end of male xisually with a long, ventral row of preanal 

 papillae. No accessory piece. Testes paired. Female 

 genital tubes generally paired, symmetrical, reflexed. Caudal 

 glands and occasionally a spinneret present. 



Hab. Soil and fresh water, rarely marine. 

 Genotype : T. glomerans Bastian, 1865. 



Bastian, 1865, Trans. Linn. Soc. London, xxv, 93, 115; de ' 

 Man, 1884, Diefrei . . . lebenden Nematodender Niederl. Fauna, ; 

 44; Micoletzky, 1922, Arch. f. Naturg., Abt. A, Ixxxvii, 148. 



* Cobb states in his description of the genotype that " tlie spiculum 

 is vestigial," but in the key to genera the genus is placed among forms 

 with " spicules two, equal, more or less arcuate." 



