Fig. 340.—Physaloptera mordens, Leiper, 1907. (1) adult male: o.e., œsophagus; ch.i., chyle intestine; t.c., testicular coils; ves. sem., vesicula seminalis; sp. 1, long spicule; sp. 2, short spicule; B., bursa. (2) Mouth parts: c., cuticular collar embracing the two lips posteriorly; c.b., cuticular bosses guarding the mouth laterally; e.d., external tooth; i.d., internal tooth; sm.p., submedian papillæ. (3) egg of P. caucasica. (4) egg of P. mordens. (5) bursa enlarged: ped.p., pedunculated papillæ; ses.p., sessile papillæ. (After Leiper.)
Ascaris lumbricoides, L., 1758.
The colouring, in the fresh condition, is reddish-yellow or greyish-yellow; the body is of an elongated spindle shape. The oral papillæ are finely toothed. The dorsal papilla carries two sensory papillæ, the two ventral papillæ each one sensory papilla. The male measures from 15 to 17 to 25 cm. in length, and about 3 mm. in diameter; the posterior extremity is conical and bent hook-like ventrally; the spicules measure 2 mm. in length, are curved, and somewhat broadened at their free end; on each side around the orifice of the cloaca there are seventy to seventy-five papillæ, of which seven pairs are post-anal. The testicular tube is much folded, showing through the body integument, and is about eight times the length of the body. The female measures 20 to 25 to 40 cm. in length and about 5 mm. in diameter; the posterior extremity is conical and straight. The vulva is at the junction of the anterior and middle thirds of the body, which, at this point, has a slight ring-like constriction; the convoluted ovaries measure ten times the length of the body.
Fig. 341.—Ascaris lumbricoides. a, posterior extremity of the male with the spicules protruding from the orifice of the cloaca (Sp.); b, anterior extremity from the dorsal surface, the two lobes of the pulp of the lip separated by the “saddle”; c, anterior extremity from the ventral surface; P., excretory pore. (From Claus.)
