stcitiia, tin' sulivi'iitrjls iic:ir tlic li;is(' (if llic ini't:iciirpus. 'I'lic 

 iiiiinln'r ami arranninu'iit of the micliM cDncspdiicls totally or 

 a|ipr(i.\iiiiat('ly to h'iKilxtilis in all forms stiiiiicd witli niu' ex- 

 <-i'ptiiiii: Martini (l!M(i) rooonls three nuclei in each of the 

 siilivcntral I'sopliajreal glands of Oxi/iirix e(iiii which fact might 

 oonceivalily be ihn' to either Kigantism or Tnisinterpretation. 

 The esophatro-intestinal valve is triradiate, more or less rhah- 

 ditoi<l. and contains five to seven nnclei. 



The Ascariiloidia imhules some forms which have esophagi 

 of the tlielastomatid type sndi as Cosnioo'icoitlrs. With the 



exception of the Ascari<iiilae (in which no iinlication of a sto- 

 matal region is ajiiiarent) and the Sulnilnrinae (in which there 

 is a short wide stoma) the stomatal region in the Ascaridoidea 

 is surronniled liy esophageal tissue containing radial muscles. 

 The mollified stomat.'il region so formed is termed a i:fnlibulr. 

 In some ascaridoids, the isthmus is obliterated, the hull) being 

 in direct continuity with the eori)us such as Ilitirakis, while 

 in still others (Spirdnoura) , it may be ovoid to spheroid; a 

 few forms have no valves, the bulbar region being elongated 

 (Qiiiiniicrio } and others have a cylindrical eso|)hagus eithiT 



CAMALLANUS 



CUCULLANU5 



DiaKranis of esophagi, including representatives of the {Leidynema, CephuloheliUH) , Ascaridoidea {Spirononra 



Hhabditoidea (Khabdititt, Dii'l'iffastcr) . Tylenchoidea (/>i- to Contrnraeeum) , CaiiialhinoideA iCamaUanntt, Cucul- \r /^j 



ti/tenchux. Apheleurlnin) , StronKyloidea (OfnophaynHto- lanujt), Dracunculoidea {Mirropleura to Phitonfwa). \ r 



mum), Metastrongyloidea {Metantrunf/ylus) , Oxyuroidea Original. 



79 



