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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    spicule there is also a hollow tube, the walls of which taper away towards the tip, thus exposing the lumen. The arrangement of the papillae agrees exactly with the description of Railliet and Henry. There are four pairs of simple papillae at the base of the acicular tip (text-fio'. •J, d). After a short interval, and lying well on the ventral surface, there is a, pair of large double-headed papillae (text-fig. 2, c); alongside these on either side commences a double series ol simple papillae, which extends forward to become preana] without a distinct break. These papillae continue still further in single series after about the eighth paired set. On either side the cuticle is raised from the body-wall and flattened dorsoventrall v to form a shallow keel (text-fig. '2, I)) not more than 0' 15 mm. deep. 4. Kathleena osculata (Rud.). Ascaris osculata, Rud. 1802. A large number of somewhat immature forms of this common species were found in the Sea-Leopard llrlydrurc/a leptonyx) and the Crab-eating Seal (Lohodon carcinophagus). Forms which appear- to be the larvae of this parasite were encysted in the mesentery and under the peritoneal coats of the pyloric processes and in the liver of Trematomus bemacchii. The species has previously been recorded in Antarctic Seals by v. Lin- stow and by Railliet and Henry. 5. Kathleena rectangula (v. Linst.). Ascaris rvrtmtijuhi, v. Linstow, 190(5. ,, stenocephala, Railliet and Henry, I 'JOT. Hosts.—In association with the previously described species, A. radiata, in the Weddell's Seal were a, number of larger specimens. These have already been recorded by v. Linstow as Ascaris rectangida; and about the same time by Railliet and Henry under the name of Ascaris stenocepliala. Pan/sit,-.—Male measures 25 cm. Female 5 cm. rigid forms. To the naked eve they appear to be large and mature forms of Kathleena radiata. The general topography is the same. There are three labia, intermedia. The oesophagus has an appendage and the gut has a blind anterior prolongation. The papillae in the tail differ only in detail from those of A. radiata. The spicules are equal and measure 4*4 mm. ; thev end in a slight dilatation. They are ()-()4 mm. across. The anus is 027 mm. from the tip of the tail. Fig. 2.—Kathleena radiata (v. Linst.) : ventral view of the posterior extremity of the male, showing the characteristic arrangement of the papillae. a, Anogenital aperture ; h, euti- cular alae; c, paired double papillae; <1, caudal group of four papillae. Both are stout, opaque and