APPENDIX. 



NOTES ON SOME PAEASITES OBTAINED FROM THE CHALLENGER SPECIMENS 

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



In the 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., Leptoiihryxiis, 

 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 known parasite found on 

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

 certain Schizopods {Eurythrops, Amhlyops, and Pseudomma). These three Bopyridans 

 were found to belong to two distinct genera, viz., Aspndophryxiis, 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 leuchartii of Salenskj'. 

 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 fio-ures of all the parasites met with, for the most part in their natural position on 

 the Schizopods infested by them. 



' Giiimard's Voya<^e en Scandinavie, Zoologie. ' Die zweite deutsche Polarfabrt., Zoi>loyie. 



3 Die Crustaceen gesamtuelt wahrend der Fahrten des " Willem Barents " in den Jaliren 1878 und 1879. 

 ■• Oversigt over Norges Crustaceer, i. ; and, Crustacea et Pycnogouida nova Expeditionis Norvegicae. 



