40 



ECHTNODERMS OF THE BRITISH ISLES 



Fig. 24. — Hathrometra Sarsii. Nat. size. (From Danmark's Fauna. 



Fig. 25. — Pentacrinoid of Hathrometra Sarsii in an advanced stage of 

 development, ready to detach itself from the stalk. Numerous cirri 

 have developed. Only the basal part of arms and the proximal part of 

 stalk represented. Note the large anal cone. (After M. Sars.) x ca. 6. 



