. Discovery reports. Discovery (Ship); Scientific expeditions. 554 DISCOVERY REPORTS diameter, its posterior portion being club-shaped. Its length is 0-9-1 mm. There is a large intestinal caecum, which runs forward ventrally to the oesophagus almost as far as the nerve-ring. The excretory pore is situated at 0-35-0-37 mm. from the anterior extremity of the worm. The caudal end of the male is curved ventrally. The tail is conical and sharply pointed, and measures 0-21 mm. in length. The usual preanal sucker-like organ is present. There are ten pairs of caudal papillae, of which five are preanal
. Discovery reports. Discovery (Ship); Scientific expeditions. 554 DISCOVERY REPORTS diameter, its posterior portion being club-shaped. Its length is 0-9-1 mm. There is a large intestinal caecum, which runs forward ventrally to the oesophagus almost as far as the nerve-ring. The excretory pore is situated at 0-35-0-37 mm. from the anterior extremity of the worm. The caudal end of the male is curved ventrally. The tail is conical and sharply pointed, and measures 0-21 mm. in length. The usual preanal sucker-like organ is present. There are ten pairs of caudal papillae, of which five are preanal. Their arrangement is indicated in Fig. 11. The spicules are about 0-85 mm. long, and the accessory piece about o-i mm. The tail of the female is straight and conical, measures 0-2-0-22 mm. in length and is usually tilted dorsally at an obtuse angle. The vulva, which has very prominent lips, is situated at 2*3 mm. from the posterior end in a specimen 6-3 mm. long. The vagina and the common trunk of the uterus run anteriorly from it. At a point slightly in front of the middle of the body the common trunk divides into two branches. One of these runs straight forward, and the coils of its ovary extend as far as the junction of the oeso- phagus and intestine. The other branch almost immediately turns posteriorly, and the coils of its ovary extend nearly as far as the anus. The eggs measure about 0-09 mm. x 0-05 mm. This species would fall into the genus Dichelyne Jagerskiold, 1902, as recently re-defined by Gendre (1927, p. 261). This genus was suppressed by the writer (1923 h, p. 233) as a synonym of Cucullanus. The only real character which can be adduced to separate it from the latter being the presence of an intestinal caecum, the revival of the genus Dichelyne does not appear necessary unless a further study of the contained species should reveal other important distinguishing Fig. II. Cucullanus fraseri. Posterior end of male, lateral view, , accessory piece
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectscientificexpedition
