EEPOET ON THE ISOPODA. 175 



The antennas are broken off short on both sides of the body. 



The mandibles appear to be without a palp. 



The thoracic appendages agree with the generic description given above. The 

 abdominal appendages are covered over by the operculiform first pair, which form a 

 single plate as in allied forms. 



The uropoda are entirely wanting. 



Station 246, July 2, 1875; lat. 36° 10' N, long. 178° 0' E.; depth, 2050 fathoms; 

 bottom temperature, 35°"1 F. ; bottom, Globigerina ooze. 



ADDITIONAL NOTE. 



Besides the new species described in this Eeport there are a few Parasitic Isopoda, 

 which I have not had time thoroughly to investigate and which may or may not be new 

 to science. These are for the most part Bopyrids parasitic under the carapace of both 

 Schizopods and Decapods, and a few have been referred to by Professor Sars in his 

 Report on the Schizopoda, already published. 



One species, apparently belonging to the genus Hemioniscus, was found in the larval 

 stage attached to Se7vlis cornuta, on the dorsal surface of some of the anterior segments. 

 It is, I believe, a rare occurrence to find an Isopod parasitic on an Isopod, at any rate 

 only one instance is mentioned in Bronn's Klassen und Ordnungen des Thierreichs, where 

 a full list of the parasitic forms and their distribution is given. 



