90 ASCAROIDEA 



truncate, produced into a kind of low collar, and without lips, 

 papillae or bristles. Lateral organs circular. Buccal cavity 

 small, funnel-shaped, unarmed. Oesophagus cylindrical, 

 slightly swollen behind. Male unknown. Female genital 

 tubes paired, opposed, reflexed. Caudal glands well developed. 



Hab. Fresh water. 



Genotype : D. inflata Onorato-de Cillis, 1917. 



Onorato-de Cillis, 1917, Monit. Zool. Ital., xxviii, (4-5), 58. 



e. Seuratiella Ditlevsen, 1921. 



Syn. Seuratia Ditlevsen, 1919, nee Skrjabin, 1916. 



Cuticle striated. Head truncate, with a single crown of 

 short, rather stout bristles. Lateral organs spiral. Pharynx 

 shallow and not very spacious, without teeth. Oesophagus 

 cylindrical, without bulb. Caudal end of male with one large 

 and three smaller preanal supplementary organs. Accessory 

 pieces rod-shaped. Female unknown (description based on a 

 single male specimen). 



Hab. Marine. 



Genotype : tS. [Setiratia] gracilis (Ditlevsen, 1919). 



Ditlevsen, 1919, Vid. Medd. Naturh. Foren., Copenhagen, 

 Ixx, 197; and 1921, Ixxiv, 60. 



According to Ditlevsen, this genus is closely related to 

 Ci/atholaimus, but differs in the shallowness of its buccal 

 capsule and in the absence of teeth. 



f. Cricolairaus Southern, 1914. 



Cuticle finely striated. Head rounded, with a single crown 

 of four long submedian bristles. Lateral organs in the form 

 of thick spirals. Buccal cavity small and narrow, surrounded 

 at its junction with the oesophagus by a stout chitinoid ring. 

 Oesophagus with a posterior bulb. Caudal end of male with 

 a median ventral series of supplementary organs. Spicules 

 simple, curved. An accessory piece present, in the form of a 

 flattened plate with a stout posterior process. 



Hab. Marine (in sand). 



Genotype ; C. elongatus Southern, 1914. 



Southern, •1914, Proc. R. Irish Acad., xxxi, 20. 



g. Platycoma Cobb, 1894. 



Cuticle unstriated, but with bristles throughout, which are 

 inconspicuous except at the anterior end. Head separated 

 from body by a broad and shallow constriction. Three small 

 conical lips (termed teeth by Southern) and ten cephalic 

 bristles present. Lateral organs more or less circular. 



