APPENDIX. 



NOTES ON SOME PAEASITES OBTAINED FEOM THE CHALLENGER SPECIMENS 

 OF SCHIZOPODA (Pl. XXXVIII. Figs. 8-23). 



In tlie following pages I purpose directing the attention of zoologists to certain ecto- 

 and endo-parasites found infesting a few of the Challenger Schizopoda I have examined. 

 My intention is not to give full descriptions of these parasites, belonging, as they do, to 

 groups on which I have not been called upon to report. Meanwhile, I have not seen fit 

 to pass them by altogether, seeming, as they do, to exhibit quite a particular interest, 

 and, moreover, since they undoubtedly may serve to complete our knowledge of the 

 biology of the Schizopoda. 



Long ago Kroyer recorded ' a peculiar Bopyridan infesting the Arctic Mysidan, 

 My sis oculata, Fabr., under the name of Dajus mysidis, which form has more recently 

 been described by Buchholtz ^ and Hoek'^ under a new generic name, viz., Leptopliryxus, 

 the latter authors having apparently not been aware of the figures and name given by 

 Kroyer in the above cited work. This form was the only knowi parasite found on 

 Schizopods, until the author recorded* three other Bopyridans, likewise met with on 

 certain Schizopods {Eurythrops, Amblyops, and Pseiidomma). These three Bopyridans 

 were found to belong to two distinct genera, viz., Aspidophryxus, G. 0. Sars, and Noto- 

 phryxus, G. 0. Sars. Moreover, the author has observed, on species of the Mysidan 

 genus Erythrops, a peculiar Lernseid, apparently the Sphceronella leuckartii of Salensky. 

 All these forms are, however, true ecto-parasites. No endo-parasites, on the other hand, 

 have as yet been found in any form of Schizopods. But in a few specimens of' 

 Euphausiidans from the Challenger Expedition, I have also succeeded in detecting two 

 forms of true endo-parasites, or intestinal worms, one of which, at least, exhibits a most 

 peculiar appearance and certain highly remarkable features. On PI. XXXVIII. I have 

 given figures of all the parasites met with, for the most part in their natural position on 

 the Schizopods infested by them. 



1 Gaimard's Voyage en Scandinavia, Zoologie. ^ Die zweite deutsche Polarfahrt., Zoologie. 



2 Die Crustaceen gesammelt walirend der Fahrten des " Willeni Barents " in den Jahren 1878 und 1879. 

 * Oversigt over Norges Crustaoeer, i. ; and, Crustacea et Pycnogouida nova Expeditionis Norvegicse. 



