Entozoa : an introduction to the study of helminthology, with reference, more particularly, to the internal parasites of man / by T. Spencer Cobbold.

  • Cobbold, T. Spencer (Thomas Spencer), 1828-1886.
Date:
1864
Catalogue details

Licence: Public Domain Mark

Credit: Entozoa : an introduction to the study of helminthology, with reference, more particularly, to the internal parasites of man / by T. Spencer Cobbold. 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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    cation which, in some important details, will be found to depart from the plans generally in vogue :— /' Turbellaria Stekelmintha ] (Ord. 1). (Sub-class I.) I Trematoda (Ord. 2). HELMINTHA ) Ccelelmintha Nematoda (Class.) ) (Sub-class II.) (Ord. 3). AcanthocepJiala Anentekelmintha ) (Ord. 4). Entozoa. (Sub-class III.) ) Cestoda (Ord. 5). In this scheme it will be noticed that I have not hesitated, on the one hand, to place the Turbellaria amongst the solid or paren- chymatous helminths {sterelmintha, Owen; a-repea—e\fiiv6e<;) • whilst, on the other hand, I have formed a new sub-class for those hel- minths which are not provided with an intestinal canal (anenterel- mmtha ; a—evrepov—6\/j,iv6e<;^ .* The hollow or cavitary group stands as before [coelelmintha, Owen ; koiXt]—eXyaw^e?). In regard to the first change here proposed, I may remark that the Turbellaria come nearer to the Trematoda than they do to the suctorial annelids ; wliich latter, be it remembered, are furnished with a complete intestinal tube and anus, and, moreover, their characters, by the intervention of the planarise, are too closely linked on to the Tre- matoda to permit of their being elevated by themselves into a separate class. Von Siebold, however, has done this, in my opinion, on insufficient grounds; but it is not unlikely that he would, in opposition to the views here advanced, urge the impropriety of calling the Turbellaria true helminths. In reply, I should be ready to admit that the Turbellaria are not helminths in the same sense as the entozoa, properly so called, but by imparting to the term hel- minth a wider signification than that to which it was restricted * Since the above was written, Prof. Leuckart (on showing him the M.S.) drew my attention to the circumstance that he had some years back employed the term Anentemta to include the Acanthocephala and Cestoda. He referred me to Carus {System, der Thierischen 3forpholocjie, s. 417), where I find the term in question adopted.-T. S. C.