No. IX. 



ECHINODERMATA. 



281 



of a fauna, on the basis of such scanty material as it is pos- 

 sible for a single expedition to furnish ; and the authors feel 

 that the great hesitation which they have in expressing 

 definite opinion is fully warranted by the fact that considerable 

 additions have recently been made to the Echinifauna of 

 Northern-European waters, the details of which have not yet 

 been published ; and these investigations may, in all proba- 

 bility, have the result of going far towards rendering present 

 generalisations invalid. 



Table shoiving the general Geographical Distribution of the various Species 

 above mentioned ; together with an Indication of those obtained by the 

 previous Arctic Explorers, Captains Parry and Penny. 



This was dredged by Sir John Ross in 1818. 



