388 MARCtARET ROBINSON. 



adult. He suggested further investigations to find out if it 

 resembled the Decapods. 



Metschnikoif himself is strongly in favour of the inclusion 

 of Nebalia among the Malacostraca. He says that its most 

 phyllopod-like feature^ viz. the thoracic legs, differ really 

 from those of the Phyllopods in number and development. 

 Further, that the mouth-appendages resemble those of the 

 decapods, that the digestive organs are not like those of the 

 Phyllopods, and that the openings of the oviducts arc in 

 the wrong place for a Phyllopod. He concludes by saying 

 that it has only a general similarity to the Branchiopoda. 



He then points out that Nebalia greatly resembles the 

 Schizopods in the number and arrangement of the append- 

 ages, many of these having five to eight thoracic limbs with 

 gills, though in their case the change of leg into gill does 

 not go so far as it does in Nebalia. Then he remarks on 

 the great likeness between the gill of Nebalia and the 

 swimming leg of Euphausia. In conclusion Metschnikoff 

 suggests that Nebalia be removed from the Phyllopods, 

 where Milne-Edwards had placed it, to the Decapods, and 

 that a special group be made for it side by side with the 

 Schizopods. (One must suppose that by Decapods he means 

 Malacostraca.) 



Claus (1872) wrote concerning the anatomy and systematic 

 position of Nebalia. He could not agree with Metschnikoff 

 in placing it among the Decapods, as he thought it had no 

 true Zoa)a stage. However, he expressed the opinion that 

 Nebalia must bo very nearly allied to the Malacostraca. 



v. Willcmocs-kSuhm (1875), in describing a new species of 

 Nebalia found by the Challenger Expedition, places the 

 Nebaliada3 among the Schizopods. In 187G Claus, in his 

 ' Crustacean System,' gave an account, with some figures, of 

 Nebalia. He there drew attention to the likeness between 

 Nebalia and the Mysida) as regards heart, digestive canal, 

 nervous system, antennary gland, and genital organs. 



One might infer, from the words of Milne-Edwards and 

 Latreille, that they believed that the Malacostraca were 



