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diadema Costa infested with a species of Sphceronella (S. diadema Giard and Bonnier, without 

 description) and two other specimens of the same Amphipod with Podascon Bella Valid Giard 

 and Bonnier. Of Decapoda there have only been found as yet Choniostomatidse on Hippoh/te 

 Gaimardii M.-Edw. and on Hipp, polaris (Sab.); both these species, we know, are not 

 unfrequently infested, either with Hemiarthrus dbdominalis (Kr.) under the abdomen, or with 

 Gyge Rippolytes (Kr.) in the branchial cavity. In a specimen infested with Clioniostoma J. Sparre 

 Schneider has observed a specimen of Hemiartlirus, and on a specimen of Hipp. Garmardii, 

 under a large swelling on the right side of the animal, I have found eleven ovisacs and an 

 adult female of Chon. Hansenii, as well as an adult male and a tiny female (smaller than 

 the male) of Gyge Hippolytes, and besides, under the apparently normal left side of the 

 carapace, a male of Gyge. In the species of the genus Erythrops (order Mysidacea), G. 0. Sars 

 has found the Epicarid Aspidophryocus peltatus G. 0. S., and Giard and Bonnier have reserved 

 this name for the form found on Er. erytforophthalmus (Goes) (E. Goesii G. O. S.), and 

 established a new species, A. Sarsii G. and B., for the form which lives on E. microplithalmus 

 G. 0. S. Giard and Bonnier have found their type specimens of the latter species (the value 

 of which future examination will have to decide) on the same specimen as their type 

 specimens of Aspidoecia Normani, and I have found a specimen of Aspidoplwytrus on an 

 Er. erytlirophthalmus sent to me by Prof. Sars as infested with Aspidoecia, but this parasite 

 must have fallen off before the animals were sent to me, if it was ever there at all. 



The genus Sylon Kr., belonging to Rhizocephala, lives, as we know, on the ventral 

 side of the abdomen in some species of Hippolyte, but I have not found it on any specimen 

 infested with Choniostoma. The remaining species belonging to Rhizocephala and Copepoda, 

 which are parasitic on Malacostraca, have all been taken on forms on which no Choniostomatidse 

 have been found. 



Together with Splimronella paradoxa I have found repeatedly in the marsupium of 

 Bathyporeia several specimens of a species belonging to the family Tyroglyphidae (the 

 order Acarida). 



Of other parasites I have only detected some Protozoa on the branchiae and the 

 marsupial plates in the material of Malacostraca with Choniostomatidse examined by jne. 



So I have arrived at the result that there exists no connection at all between 

 Choniostomatidse and any of the other parasites of different orders found on the same 

 species of hosts. 



g. Nourishment. 



I cut a bit of skin of an Erythrops in the place where an Aspidoecia had been 

 attached, cleaned it with caustic potash from muscles and viscous substance, and discovered 

 a small hole, where the mouth of the parasite had its place. And this seems very natural 

 indeed; in the first place, the mandibles appear quite well qualified for producing such a 

 hole; secondly, the mouth is doubtless suctorial, and lastly, the female, which is permanently 



