64 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 8l 



Astacus fluviatilis. See Astacus asia- 



cus. 

 Astacus japonicits. Sec Camharo'idcs 



japo)iicits. 

 Astacus Icptodactylus 



Distoiiitun rcinhardi 

 Cambaro'idcs japoniciis 



Paragonimus icestcnuaii i 

 Cambaro'idcs si in His 



? Paragonimus ivcslcrmani 

 Cambanis propinqmis 



Microphallus opacus 

 Cambanis spp. 



Crcpidosto ni u ui corn utuni 

 Ccrataspis nionstrosa 



Dinurus tornafus 

 " Crabs " 



Distonuim kalapdi 

 " Crayfish " 



Astacntrcma cirrigcruni 



Acrolichaniis petal osa 



Plagiorchis ameiurensis 



Distoma of Cooper, 1883 



Distomum of Linton, 1892 

 Eriocheir japonicus 



Paragonimus ivestcrniani 



Stcphanolecithus parzms 

 Gcothclphusa dchaani. See Pofamon 



{Gcothelphusa) dchaani. 

 Gcothclphusa obtusipes. See Potamon 



{Gcothelphusa) obtusipes. 

 " Marine decapods " 



Rhynchobothrius ruficollis 



Potamobiiis astacus. See Astacus asta- 



cus. 

 ParathclpJuisa (Parafhclphusa) sinen- 

 sis 

 Stcphcuiolccith us parvus 

 Potamon dchaanii. See Potamon 



( Gcothclphusa) dchaani. 

 Potamon' obtusipes. Sec Potamon 



(Gcotliclphusa) obtusipes. 

 Potamon sinensis. See Parathclphusa 



(Parathelphusa) sinensis. 

 Potamon (Gcothclphusa) dehaani 

 Paragonimus zvestcrmani 

 Macroorchis sp in ulosus 

 Stephanolecithus parvus 

 Potamon (Gcothclphusa) obtusipes 

 Paragonimus ivestermani 

 Stephanolecithus parvus 

 PseudotheJphusa iturbci 



Paragonimus ivestermani 

 Scsarma dchaanii 

 Paragonimus ivestermani 

 Stephanolecithus parvus 



Ascllus aquaticus 

 Caniallanus elcgans 

 Hedruris androphora 

 Acanthocephahts lucii 

 Echinorhynchus ranae 



Porcellio laevis 

 Dispharynx spiralis 



GENERAL DISCUSSION 



On the basis of the foregoing lists, the arthropod hosts are arranged 

 below in their approximate order of relative importance for each 

 order of parasites, with a resume of the numbers of host and para- 

 site species involved. 



As intermediate hosts for tapeworms with primary hosts living in 

 water or feeding on arthropods which live in water, the Copepoda are 

 of outstanding importance, the next most important group being the 

 Ostracoda. The Amphipoda, Decapoda, and Cladocera are much less 

 extensively involved as intermediate hosts for tapeworms so far as 

 is known at the present time. 



