Page:Tropical Diseases.djvu/894

838 The male has a terminal bursa provided with a posterior ray split into two widely arching component parts, vaguely recalling the arrangement in œsophagostomum. The genital orifice of the female opens posteriorly. The vagina is short and opens into two uterine tubes. The mouth collar is moderately developed, and the entrance to the mouth is surrounded by a double series of delicate fringes composed of cuticle—the corona radiata. The buccal capsule is a barrel-shaped chitinous

Fig. 184.—Triodontophorus deminutus, female. (After Leiper.)

1, Anterior extremity; 2, posterior extremity. C.R., corona radiata; B.C., buccal cavity; Ch.P., chitinous plates; N., nerve ring; Œs., œsophagus; Ch.I., chyle intest.; Ut., uterus; Vag., vagina; V., vaginal opening; R., rectum; A., anus.

structure; posteriorly it comes into contact with the œsophagus. The œsophagus is stout and muscular and triradiate on section. Each of the surfaces of the œsophagus terminates in a chitinous plate projecting into the buccal capsule. The cuticle is transversely striated.

This appears to be a common human intestinal parasite in Central Africa. Leiper found it frequently in material sent by Dr. Turner from natives of Portuguese E. Africa. From