Parasitic worms, with a note on a free-living nematode / by R.T. Leiper and E.L. Atkinson.

  • Leiper, Robert Thomas, 1881-1969.
Date:
1915
Catalogue details

Licence: In copyright

Credit: Parasitic worms, with a note on a free-living nematode / by R.T. Leiper and E.L. Atkinson. Source: Wellcome Collection.

Provider: This material has been provided by London School of Hygiene & Tropical Medicine Library & Archives Service. The original may be consulted at London School of Hygiene & Tropical Medicine Library & Archives Service.

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    Parasite.—Male 9 mm. long. Female 10 mm. Both are flattened forms, but whether this is due to treatment after death or not cannot he stated. The greatest breadth of both male and female is 25 mm. The worms are almond-shaped, the male tapering more rapidly towards the posterior end than the female. The proboscis (PI. II, fig. 13, a) measures 2 mm., the hook-bearing portion being 0*5 mm. long. The hooks on the rostellum are arranged in fourteen linear series, each having eight hooks. There are no cuticular swellings around the hooks. In these features of the proboscis these forms differ from the succeeding species, to which they show considerable i resemblance. The lemnisci (L V) are stout and club-shaped, ]laving a length double that of the internal part of the pro- boscis. The testes ('/, d') are oval, 02 mm. by 0'25 mm., are diagonally situated, and occupy the third fifth of the body. The prostatic glands are aggregated into two large masses. 11. Echinorhynchus rennicki, Leip. and Atk. (PI. II, fig. 15. Text-fig. 3.) Echinorhynchus rennicki, Leiper and Atkinson, Proc. Zool. Soc, 1914, p. 223. Male 3 • 7 mm. long. Female 4 mm. Proboscis 1 mm. Hook-bearing rostellum 0*3 mm. Hooks in 12 linear series of 6 each. Those of alternate rows are in line transversely. Each hook protrudes from a transparent / cuticular lapel. Lemnisci long and slender. Host. — These medium sized thorn-headed worms were obtained from Trematomus bernacchii at Cape Evans, Lat. 77° 38' S. (Stat. 326). Parasite.—The male and female of this species are similar in shape, and can only be differentiated by their internal structure save where, in the male, the bursa is extruded posteriorly. The greatest breadth is quickly attained in the anterior half of the body. The posterior half tapers gradually and uniformly to the tail. The male measures 3 ■ 7 mm. iu leno th and 0' 8 mm. in Fig. 3.—Echinorhynchus rennicki: Female, tilled with eggs, breadth. The female averages 4 mm. by 1 mm. The' proboscis The cuticular lapels (pp jj fig_ 15> ^ iu t}ie male jg x mm ; [n t]ie female i.2 mm. covering the hooks i-iii- • i ■ ^ r. i ^ on the proboscis are lonS > the hook-bearing portion being 0*3 mm. by 0'12 mm. shown. There are twelve longitudinal rows of hooks with six hooks in each row. The hooks of every second row are in line trans- versely. A striking feature of the proboscis is the presence of a transparent cuticular swelling from which each hook protrudes. By this character alone the species can be distinguished readily from the other forms found in the same host. The lemnisci (Fig. 15, I, I') are long slender bodies, from the posterior end of which a bundle of muscle-fibres passes backwards and becomes attached to the body-wall half