20 ASCAROIDEA 



8. Amblyonema v. Linstow, 1898. 



Three low conical lips present. Slight lateral alae, rounded 

 posteriorly. At the base of the oral cavity three trilobed 

 teeth present. Oesophagus long, slender, wdth a small 

 prebulbar swelling and a large posterior bulb. Tail rounded, 

 with a short terminal spike. Male with three pairs of preanal 

 and one pair of postanal papillae, the latter dorsally directed. 

 Two equal, alate spicules and an accessory piece present. Vulva 

 in the posterior half of the body. Eggs large, thick-shelled. 



Hab. Intestine of Australian Lung-fish (Ceratodus) (one 

 species known). 



Genotype : A. terdentatum v. Linstow, 1898. 



V. Linstow, 1898, Denkschr. Med. Nat. Ges., Jena, viii, 470. 



According to Travassos (1920 ( ?)) this genus falls into the 

 subfamily Oxysomatinae of the family Oxyuridae, and is 

 placed by him near Probstmayria, which in our view belongs 

 to the Kathlaniidae. The characters mentioned by v. Linstow 

 for Amblyonema seem to us to indicate closer relationship with 

 the latter family than with, the Oxyuridae. 



9. Spectatus Travassos, 1923. 



Head somewhat wider than neck. Lips well developed, 

 bilobed. Prebulbar swelling of oesophagus much reduced. Tail 

 of male short and conical. A muscular preanal sucker-like 

 organ present. Caudal papillae sessile, twenty-two in number 

 (five pairs preanal). Spicules short, falciform, equal and alate. 

 Accessory piece V-shaped. Tail of female very short. Vulva 

 in the middle of the body. Vagina long. 



Hab. Intestine of a Fish (one species known). 

 Genotype : *S'. sjiectatus Travassos, 1923. 



Travassos, 1923, Folk. Med., Rio de Janeiro, vi (15 Feb.), 29. 



Fam. 4. OXYASCARIDAE Travassos, 1920. 



Parasitic forms. * Meromyarian. Males very much smaller 

 than females. Lips greatly reduced. No Isuccal capsule. 

 Oesophagus with a pyriform ventriculus. Intestine ends in a 

 voluminous pyriform rectum which is highly chitinized. 

 Spicules equal, small, poorly chitinized. Accessory piece 

 apparently absent. Caudal alae absent. Caudal papillae 

 few. Vulva in anterior half of body. Uteri opposed. Eggs 

 contaming embryos when laid. 



1. Oxyascaris Travassos, 1920. 

 With the characters of the family. 

 Hab. Intestine of Reptiles and Batrachians. 

 Genotype : 0. oxyascaris Travassos, 1920. 



