CRINOIDEA 27 



Brachials not strongly produced, at most the distal edges of the 

 outer brachials bordered with fine spines ... 7 



Pinnulci much elongated, 2-3 times as long as Pg 



7. Hathrometra A. H, CI. 

 Pinnulci scarcely longer than Pg . Thaumatometra A. H. CI. 



Fig. 12. — Cirri of Hathrometra Sarsii (1) and Antedon petasus (2). x 6. 

 (From Danmark's Fauna.) 



Subfamily Antedonin.^ 

 1. Antedon de Freminville. 



Centro-dorsal hemispherical, not wholty covered with cirri, 

 the apex remaining naked. Cirri without dorsal processes on 

 their distal ends, usually short, rarely with more than 20, never 

 more than 30, segments. Pinnule^ about twice as long as Pg, the 

 latter as long as Pg. 



Two species are found in the British seas. A supposed third 

 species, Antedon Milleri Wyv. Thomson, is not recognisable, and 

 is probably identical with A . bifida. Three more species are found 

 in the Mediterranean, one of these, A. moroccana A. H. Clark, 

 is also distributed along the Atlantic coasts of Africa, down to 

 Senegal, and even to the Azores. But as it is not known from 

 north of Gibraltar there is scarcely any probability of its occurring 

 in the British seas. (Keys to all the Atlantic species of the genus 



