HELIOMETRINAE 



149 



concave. They are in apposition for the greater part of their length but the distal corners 

 are free. The distal edge may be smooth or raised into a low finely-thorny ridge. The 

 costals are longer than the radials, not in apposition laterally. The distal edge of each 

 is raised on either side of the incision by the axillary into a thorny lip at right angles to 

 the surface of the ossicle. 



Fig. 4. Florometra antarctica. a, centrodorsal and parts of three rays, X7. b, cirrus, xy. c, Pj, xii. 



d, spicules from tentacles of distal pinnules, x 1 14. 



The axillaries and the first and second brachials are of the shapes shown in Fig. 4 a. 

 The axillary is wider than the costal and forms a shoulder where it incises it ; its distal 

 edge is smooth but there are small spines on the free outer portions of its proximal edges. 

 The inner edges of the first brachials are much shorter than the outer; they do not meet, 



