EODENTIA 315 



in ' Notes on Entozoa/ part i, sp. 3, ' Proc. Zool. Soc./ Nov. 

 18th, 1873, p. 741. Idem, " On Ascaris osculata," in ' Eeport of 

 Experiments respecting the development and migrations of the 

 Entozoa;' ' Brit. Assoc. Trans./ 1864, p. 114. Heller, C., in 

 ' Schrift der zool.-botan. Gesellsch., 3 Wien, 1858, s. 83. Joly, 

 " On a new Species of Hsematozoon of the genus Filaria, 

 observed in the heart of a seal ; " from ' Compt. Rend. Acad. 

 Sci./ 1856, p. 403, in ' Ann. Nat. Hist./ vol. i, 3rd ser., 1858 ; 

 also abstr. in the ' Year Book/ 1859. Leidy, J., (E. spirocauda) 

 in ' Proc. Philad. Acad./ 1858, p. 112. 



PART YI (RODENTIA). 



Though very numerous, the parasites of this order are 

 chiefly interesting as embracing those of the hares and 

 rabbits, moles, mice, rats, squirrels, and beavers. Some slight 

 notice, however, will be given of the entozoa of each of the 

 eleven families into which the order may be divided. 



The squirrels (Sciuridce) are liable to be infested by the 

 common liver fluke (F. hepatica), and also, it is said, by a 

 cysticercus (G. tenuicollis). I have never encountered this 

 bladder worm, but in 1864 I described some polycephalous 

 hydatids (Ccenuri) which I obtained from the viscera of an 

 American squirrel. I think the host was of the same species 

 (Sciurus vulpinus) as that from which Mr Chapman has since 

 obtained an example of Echinorhynchus (E. moniliformis] . 

 This worm also infests the hamster. A very small female 

 round worm, probably a strongyle, was described by Rudolphi 

 as Ascaris acutissima. It infests the caecum of the common 

 squirrel, in which host a species of tapeworm is tolerably 

 frequent (Taenia dendritica). The common European marmot 

 is infested by T. pectinata, so abundant in hares and rabbits. 

 I have also noticed it as occurring in the Canadian porcupine 

 (Hystrix dorsata). The dormice (Myoxidte) are not much 

 troubled with parasites, at least I have not encountered any 

 in our common Myoxus avellanarius. In M. glis y however, a 

 tapeworm, and at least one species of strongyle (S. gracilis), have 

 been observed. Dujardin described very fully another strongyle 

 (8. l&vis) from M. nitela, from the long-tailed field-mouse (Mua 

 sylvatica), and from Arvicola subtcrraneus. The other species 

 are Trichosoma myooci nitclte, and Opldostoma cristatum from 



