38 ASCAROIDEA 



six papillae. A short, cylindrical buccal capsule present. 

 Oesophagus club-shaped, connected by a narrow neck with a 

 pjrriform posterior bulb. Tail of male short, conical. At 

 least one pair of preanal and one pair of postanal papillae 

 present. Spicules short, stout, equal. An accessory piece 

 present. Tail of female somewhat longer, tapering. Vulva 

 near the middle of the body, opening directly into the uterine 

 branches, which are opposed. Ovaries refiexed. Eggs few 

 and large, oval, thin-shelled, segmenting when laid, or, in the 

 case of older females, hatching in utero. 



Parasitic generation. Body considerably longer than in the 

 free-living generation, and very slender. Consisting of 

 " female " forms only. Mouth with four indistinct lips. A 

 short buccal capsule present. Oesophagus long, slender, 

 almost cylindrical, without a posterior bulb. Tail short, 

 conical. Vulva in posterior half of body, opening directly 

 into uterine branches, which are opposed. Ovaries reflexed. 

 Eggs segmenting when laid. 



Hab. Intestine of Vertebrates. (Free-living stages in 

 faeces of these animals or in the soil). 



Genotype : >S'. [Anguillula] stercoralis (Bavay, 1876). 



Bavay, in Normand, 1876, Com.pt. rend. Acad. Sci., Paris, 

 Ixxxiii, 316; Grassi, 1879, Med. Contemp., Milano, An. 2, 

 iii, 497 ; Looss, 1911, Eec. Egypt. Govt. School lied., Cairo, iv, 

 215. 



4. Anguillula Ehrenberg, 1831. 



Cuticle extremely finely striated, with narrow lateral alae 

 but without bristles. Head rounded or truncate, with more 

 or less distinct lips and one or two crowns of papillae. Lateral 

 organs apparently luiknowTi. Buccal capsule small, thin- 

 walled, hexagonal anteriorly, but for the most part three- 

 sided, and consisting of two parts, of which the posterior 

 contains (in the genotype) a very small dorsal tooth and two 

 subventral processes. Oesophagus with a distinct posterior 

 bulb. Caudal end of male with preanal and postanal papillae. 

 A single accessory piece present. Spicules equal, broad. 

 Testis single, anterior, sometimes reflexed. Female genital 

 tubes paired, opposed, the anterior only with an ovary, which 

 is reflexed ; the posterior vestigial, apparently serving as a 

 receptaculum seminis. Ovoviviparous. Caudal glands absent. 

 Excretory system consists of paired lateral canals. 



Hab. In decaying substances, stagnant water, etc. 

 Genotype : A. [Vibrio] aceti (Miiller, 1783). 



Miiller, 1783, 162 [fide Stiles & Hassall, not verified]; 

 1786, Animalcula infusoria, 63; Ehrenberg, 1831, Symbolae 

 physicae {Evertebrata), Series Prima, Phy tozoa Entozoa ; Bastian, 



