CRINOIDEA 35 



Southwards it extends to Madeira and the southern border of 

 Morocco. Known bathymetrical distribution, 46-1279 m. 



(Another species, Leptometra phalangium Joh. Midler, occurs 

 in the Mediterranean, but is not known with certainty from the 

 Atlantic. It is easily distinguished from L. celtica by its more 

 slender cirri ; the joints of the distal part are not shorter than 

 the joroximal ones, all being about twice as long as broad ; also 



Fig. 20. — Leptometra celtica. Xat. size. 



the distal dorsal edge of the joints is not swollen. The species 

 recorded from British seas as Antedon phalangium is not really 

 this species, but Leptometra celtica.) 



Subfamily Heliometrin.^ 



4. Heliometra A. H. Clark. 



Centro-dorsal hemispherical, with cirrus-sockets irregularly 

 arranged. Cirri rather stout ; the proximal segments somewhat 

 longer than wide, the distal short, with more or less prominent 

 dorsal spine. Oral pinnules greatly elongated and flagellate, 



