26 ASCAROIDEA 



coloured, broad, consisting of a single row of large cells. 

 Tail of male suddenly constricted at the level of the cloaca 

 and continued as a dorsally-directed conical process, with or 

 without a terminal spike. Five pairs of caudal papillae 

 present, of which three pairs are grouped about the cloaca 

 (one pair preanal, one at the level of the cloaca, one postanal), 

 the remaining two pairs being lateral, one at the posterior end 

 of the alae and the other midway between these and the 

 cloaca. Posterior lip of cloaca swollen into a conical process. 

 A single spicule, short, with a straight or barbed point. An 

 accessory piece present, shaped like a very open V. Vulva 

 usually beliind the middle of the body. Common trunk of 

 uterus short. Uterine branches parallel. Eggs large, few 

 in number, segmenting when laid, occasionally containing 

 embryos. 



Hab. Caecum of herbivorous Reptiles (Tortoises and 

 Uromastix). 



Genotype : T. vivipara Wedl, 1862. 



Wedl, 1862, Sitz. k. Akad. Wiss., Wien, xliv, 471, 482 ; Seurat, 

 1912, Compt. rend. Soc. Biol., Paris, Ixxiii, 223; 1918, .4rc/i. 

 Inst. Past. Tunis, x, 247. 



According to Seurat (1912, 1913, 1917), T. vivipara has two 

 types of female, one of which is oviparous and the other 

 viviparous. In the latter the larvae reach the encysted or 

 infective stage within the uterus. Seurat has proposed the 

 genus Mehdidla, with microstoma (Drasche) as its genotype. 

 The differences mentioned, however, do not appear to be suffi- 

 cient to warrant a generic distinction between Mehdiella and 

 Tachygonetria. 



11. Aorurus Leidy, 1849. 



Syn. Streptostoma Leidy, 1849. 



Cuticle coarsely striated. Mouth large, circular, ^vithout 

 apparent lips. Head followed by a slightly projecting cuticular 

 collar. Oesophagus with a large pyriform prebulbar swelling 

 and a distinct posterior muscular bulb joined to it by a slender 

 neck. The prebulbar swelling is almost equal in size to the 

 muscular bulb. Tail of male obliquely truncate ventrally, 

 and with a subulate terminal process dorsally, bearing a pair 

 of papillae near its base. Two pairs of preanal papillae and 

 a median postanal conical process also present. A single 

 spicule present. Apparently no accessory piece. Tail of 

 female extremely long and subulate. Vulva in anterior half 

 of body, behind oesophageal bulb. Uterine branches and 

 ovaries parallel. Eggs flattened on one side. 



Hab. Intestine of Myriopoda (Julus) and Orthoptera 

 (Blatta). 



Genotype : A. [Streptosto)na] agilis (Leidy, 1849). 



