434 PARASITES OF ANIMALS 



must add to the list Molin's Histiocephalus subulatus. From 

 Bancroft's collection I am certainly in possession of two dis- 

 tinct kinds of nematode taken from the stomach of Halmaturus 

 Derbyensis. I have also two species of nematode from Ma- 

 cropus giganteus. Their identification, however, is a matter for 

 future consideration. Lastly, as regards the acanthocephalous 

 parasites, only one species appears to have been described. 

 This worm (Echinorhynchus microcephalus) was obtained by 

 Olfers in Brazil, from the intestines of Didelphus philander. 

 It also occurs in I), virginiana. Being a tolerably large species, 

 that is to say 3" in length, it seems surprising that it has not 

 been found in the American opossums generally. 



BIBLIOGRAPHY (No. 56). Colbold (see Rowe). Diesing, 

 ' Syst./ 1. c., p. 519; also monogr. ( Binnenwiirmen ' (1. c., 

 Bibl. No. 55). Krcft, G., 'Australian Entozoa' (I.e., Bibl. 

 No. 55). Leidy, ' Proc. Philad. Acad./ 1856. Idem, " Tape- 

 worm from the Wombat," ibid., 1875, p. 6. Molin, " Una 

 monogr. del genere Physaloptera," p. 10, " Una monogr. del gen. 

 Dispharagus/ and ' Una monogr. del gen. Histiocephalus/ 

 p. 37, aus dem xxxix Bd., d. ' Sitz. d. m.-nat. Cl. d. k. Akad. 

 der Wissensch./ s. 479-507 und s. 637-672, I860. Rowe, J., 

 " Parasitism in Australia " (in which the author sought to 

 benefit stock-owners by utilising, prophylactically, my pub- 

 lished opinions), repr. from the 'Melbourne Leader' in the 

 'Veterinarian/ May, 1874. Rudolphi (in ref. to Dist. coro- 

 natum), ' Synops./ p. 116 and 686. Webster (respecting his 

 " Filaria/' see), ' Catalogue of the Hunterian Collection of 

 Entozoa/ p. 7, prep. 49, 1866; also the old ' Catal. of the 

 Museum Roy. Coll. Surg/ (by Owen), part iv, fasc. i, p. 37, 

 No. 170; also Diesing's 'System/ p. 280, and Froriep's 

 ' Notizen/ Bd. xlii, s. 328. 



SECTION II. 



To give an air of completeness to this treatise, I shall devote 

 the few pages remaining at my disposal to a brief summary of 

 the general facts of parasitism as witnessed in birds, reptiles, 

 fishes, and evertebrated animals. For details I must refer to 

 the separate original works and memoirs quoted in the appended 

 bibliographies. 



