CHAP, iv.] THE CRUISES OF THE 'PORCUPINE: 



175 



junction. The ventral arm-plates are entirely absent. 

 This is a large handsome star-fish. I am not aware 

 of any fossil form which can be referred to the same 

 genus; but it looks like a thing which might be 

 expected to have congeners in the upper chalk. 

 Holothurids were not frequent, but the singular 

 little Echinocucumis typica of Sars, covered with 

 spiny plates, turned up in every sifting. 



FIG. 3o.Amathia carpenteri, NOKMAN. Once and a half the natural size. (No. 47.) 



Crustacea are numerous ; but we have here entirely 

 lost the gigantic Arctic amphipods and isopods of 

 the cold area.' A pretty little stalk-eyed form 

 Dorynchus thomsoni, NORMAN (Fig. 34), small and 

 delicate, and very distinct from all previously de 

 scribed species of the genus, is very widely diffused. 



