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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    other suckers (,s) od the head are circular, and have an externa] measurement of 0 ' 24 nun. and an internal diameter of 0' I mm. Their surface is fleshy, and they are unarmed. The head is succeeded by a large globular neck measuring 0*7 cm. in length and 0'5 cm. transversely. In the interior two wide wavy excretory canals run toward the segments. Segment^.—The segments are very peculiar. There is a central portion, rounded dorsally and cupped ventrallv. From the outer borders of each segment there is a well- marked lapel or apron which crosses from either side toward the centre. It is divided by a deep cleft in the middle line from, its neighbour of the opposite side. The edge is crenated and suggests the machicolations on ramparts. Only in the latter segments were there any genitalia, developed. The testes number 30 to 40. and are confined definitely to the dorsal portion of the segment. They are large and show a, crenated outline. Two wide excretory canals run down either side, at the junction of the lapels with the segments. No eggs were present in any of the segments. The longitudinal muscular bands are very marked. The genital pore is peculiar and opens on the border oi the lapel ventrallv: the pores probably alternate. The anatomy of the segments is exceedingly difficult to make out. Encysted in the Emperor Penguin, and completely closed off, occur forms consisting of only the head and neck (PI. IV. fig. 23). Other cysts occur (Fig. 24) in which several individuals are present and the cyst is connected with the gut of the host. These worms consist of a head and a varying number of flat immature segments, the beginning of the genital apertures being visible on the sides. There also occur more mature forms in the cysts showing the peculiar conformation of the segments. In detail the heads and necks of the three forms are identical. An almost analogous case is mentioned by Railliet and Henry. These parasites were obtained by the French Antarctic Expedition from Pi/t/oscdis jMpua, and the authors ascribe the mature form to Anomotae/ua zeden,. Order TRYPANORHYNCHA. Fam. TETRA RHYNCHIDAE. Tetrai-hynchus, Raid., 1 so'.). :>7. TetrarhywIuLH sp. (larva). (PI. V, tig. 35.) This interesting little Tetrarhi/uchus was collected together with some larval Nematodes, encysted in the wall of the caecum of a Barracouta [Lcp/dop'u^ eauclatus) at