6 ASCAROIDEA 



3. Porrocaecum Railliet & Henry, 1912. 

 Sjm. Terranova Leiper & Atkinson, 1914. 



Lips with dentigerous ridges. Interlabia usually present. 

 Oesophagus with oblong ventriculus, which is short in the 

 genotype but in other species often long and bent at an angle, 

 so as to open into the intestine laterally. An intestinal caecum 

 present. No oesophageal caecum. An accessory piece is 

 rarely present. 



Hab. Intestine of Birds, marine Mammals and Fishes. 

 Genotype : P. [Ascaris] crassiim (Desl., 1824). 



Deslongchamps, 1824, Encycl. Methodiqxie, Paris, ii, 89 ; 

 Railliet & Henry, 1912, Bull. 8oc. Path, exot., Paris, v, 256; 

 Baylis, 1920, Parasitol, xii, 261. 



4. Contracaecum Pvailliet & Henry, 1912. 

 Syn. Kathleena Leiper & Atkinson, 1914. 



Lips without dentigerous ridges. Interlabia present, 

 usually very well developed. Oesophagus with reduced 

 ventriculus, giving off a posterior caecum. An intestinal 

 caecum present. 



Hab. Intestine of fish-eating Mammals and Birds, and of 

 Fishes. 



Genotype : C. [Ascaris] spiculigerum (Rud., 1809). 



Rudolphi, 1809, Entozoorum Historia Naturalis, ii, 168 ; 

 Railliet & Henry, 1912, Bull. Soc. Path, exot., Paris, v, 256 ; 

 Baylis, 1920, Parasitol., xii, 261. 



5. Cloeoascaris Baylis, 1923. 



Each lip with a pair of large conical teeth on its inner sur- 

 face. Interlabia absent. A collar-like fold of cuticle sur- 

 rounding the neck, and between this and the bases of the lips 

 an area covered with small spines. Oesophagus with a reduced 

 ventriculus giving off a posterior caecum. An intestinal 

 caecum present. Vulva in anterior half of body. 



Hab. Alimentary canal of semi-aquatic carnivorous Mammals 

 (one species known). 



Genotype : C. spinicollis Baylis, 1923. 



Baylis, 1923, Ann. Mag. Nat. Hist., (9) xi, 459, 463. 



6. Galeiceps RaiUiet, 1916. 



Head apparently with three lips, of which the dorsal is 

 bilobed, and each bears one or two teeth on its inner surface. 

 Behind the lips a collar-like cuticular fold. Interlabia absent. 

 Structure of alimentary canal not described. 



