Bursa with anterior and median ray cleft (not double), postero- and postero-external arising from a common trunk, posterior bifurcated, each limb bidigitate.
Contains at present four genera: (1) Ternidens, (2) Chabertia, (3) Œsophagostomum, (4) Agriostomum.
Genus. Ternidens, Railliet, 1909.
Buccal capsule sub-globular, opening obliquely in the dorsal surface, and having at the bottom three complex teeth resembling those of Triodontophorus.[313] Two crowns of leaflets; peristomic collar moderate, edge of bursa slightly toothed.
Type.—T. deminutus, Railliet and Henry.
Ternidens deminutus, Raill. and Henry, 1905.
Syn.: Triodontophorus deminutus, Raill. and Henry, 1905.
Body relatively thick. Cervical papillæ 0·5 mm. behind the head. Buccal capsule 40 µ deep. Teeth 40 µ long.