NEBALIACEA 



T 



By H. Graham Cannon, Sc.D. 



Professor of Zoology, University of Manchester 



(Plate XXXII, text -figs. 1-7) 



HIS report deals with the Nebaliacea collected by the 'Discovery' during the years 



1925-7- 



Nebaliopsis typica, G. O. Sars 



Nebaliopsis typica was originally described by Sars (1887) from a damaged specimen and 

 a fragment collected by the Challenger Expedition. Thiele (1904) subsequently de- 

 scribed the limbs in detail from a crushed specimen collected by the Valdivia Deep Sea 

 Expedition. The Swedish Antarctic Expedition was the first to obtain, in 1902, a com- 

 plete and undamaged specimen. This was briefly described and figured in a posthumous 

 note by Ohlin (1904), from which it appears that the animal was still alive when it 

 reached the surface. Ohlin merely named the specimen "a new Nebalia", but there is 

 no doubt that it belonged to the genus Nebaliopsis. Unfortunately, however, it has been 

 lost. Dr Nils Odhner of the Riksmuseum, Stockholm, in a letter to me says : " It is very 

 likely that it followed the sinking ' Antarctic ' to the bottom, when it was wrecked ". The 

 Discovery Expedition collected seven specimens during 1925-7, of which six were 

 crushed or fragmentary, but one was complete and undistorted. Enlarged photographs 

 of this specimen are shown in Plate XXXII. 



The following list gives details of all the specimens of Nebaliopsis which have been 



found up to the present : 



Table I. 



* Carapace and front part of body only. 

 J Living when brought to surface — subsequently lost. 

 ^ Complete undamaged specimen (Plate XXXII). 



f Caudal rami missing. 



§ Immature. Carapace crushed. 



