Eucarida — EupJiausiacea. 



49 



Division 5. EUCARIDA. 



The carapace is coalesced dorsally with aU tlie somites of tlie Table-case 

 tliorax. There is no brood-poucli. ^°- ^• 



Two Orders of very unequal size are included in this Division : — 



Order 1. — ■EiipludisiKri'ti. 

 ,, 2. — Dccapodd. 



Order 1.— Euphausiacea. 



The members of this Order were formerly included witli the 

 Mysidacea in the Order " Schizopoda." They are, however, very 

 closely allied to the Uecapoda, and are distinguished from tlie 



Mi'iiain/cHplMnrs nurvciiica, male, from the side, about twice natural size. 

 (From Lankester's " Treatise on Zoology.") 



more primitive types of that Order cliiefly by the fact that they 

 possess only a single series of gills (podobranchiae), and that none 

 of the thoracic limbs are distinctly modified as maxillipeds. 



Most of these animals, like some of tlie lower Decapods, are 

 phosphorescent. The light-producing organs, situated on various 

 parts of the bodv and limlis, were formerly described as " acces- 

 sory eyes '" ; they are seen as little red spots along the sides of the 

 body in the coloured drawing of NcvKitoscclis iiiiryojKs exhibited in 

 this case. 



Mcgaiti/cUjiliiiitfs )u»-vcijLca (Fig. .'50), one of the larger species 

 of the Order, occurs in deep water off the British coast. \u Loch 

 Fyiie, where the specimens here exhibited were obtained, the 

 species forms an important food of the herring. 



E 



