180 STRONGYLOIDEA 



2. Cooperia Ransom, 1907. 



Cuticle of anterior end frequently dilated. Cuticle of body 

 marked with fourteen to sixteen longitudinal lines or ridges. 

 Cervical papillae absent. Mouth-cavity small, indefinite. 

 Bursa with two lateral lobes and a small dorsal lobe. Latero- 

 ventral ray rather widely separated from, and considerably 

 thicker than, ventro-ventral ray, but curving distally in the 

 same direction. Postero-lateral ray slender. Externo-dorsal 

 rays long, arising high up on main dorsal stem. Dorsal ray 

 cleft for from one-third to one-half of its length ; its main 

 branches parallel or curved to form a Ijtc or horseshoe. From 

 each of the main branches, usually near its origin, a short 

 branch extends ventrally into a vesicular swelling on the 

 inner surface of the bursa. Prebursal papillae absent. 

 Spicules short, foliaceous. Accessory piece absent. 



Hab. Alimentary tract of Mammals. 

 Genotype : C. [Stronji/lus] curlicei (Giles, 1892). 



Giles, 1892, Sci. Mem. Med. Off. Army, India, Calcutta, 

 Pt. 7, 49 ; Railliet, 1893, Traite de Zool. med. et agric, 2nd ed., 

 Paris, 442 ; Ransom, 1907, U.S. De2)t. Agric, Bur. Anim. 

 Lndiist. Circular 116, 3; 1911, U.S. Dept. Agric, Bur. Anim. 

 Indust. Bull. 127, 69. 



3. Travassosius Khalil, 1922. 



Cuticle longitudinally striated except at the head, where 

 it is transversely striated. Cervical papillae prominent. 

 Buccal cavity not well defined. Bursa with large lateral 

 lobes, but without well-developed dorsal lobe. Ventral rays 

 widely separated and of very different thicknesses. Ventro- 

 ventral ray thin and directed ventrally; latero-ventral thick 

 and in close relation to the lateral rays. Dorsal ray long, 

 slender, and cleft at its tip, each branch ending in two digi- 

 tations. Prebursal papillae long and conspicuous. Spicules 

 short, twisted, with knob-like terminations. Accessory piece 

 absent. Eggs segmenting when deposited. 



Hab. Stomach of Beaver. 

 Genotype : T. rufus Khalil, 1922. 



Khalil, 1922, Atm. Mag. Nat. Hist., (9) x, 288. 



4. Graphidium Railliet & Henry, 1909. 



Cuticle with prominent longitudinal striations. Cervical 

 papillae present. Mouth large, limited by a chitinoid buccal 

 ring. Bursa with large lateral lobes, but without a well- 

 defined dorsal lobe. Latero-ventral ray larger than ventro- 

 ventral ray, but running nearly parallel to it. Externo- 



