ACTINOMETRA ALTKRXANS. 200 



Tlie rays are quite free from the second radials onwards 

 and may divide five or rarely six times, the successive div- 

 isions consisting alternately of three joints with the axill- 

 ary a syzygy, and two joints without a syzygy. The first 

 joints after each axillary quite free or but slightly united 

 laterally. First two brachials about equal in length , nearly 

 oblong ; the third (syzygy) longer with its terminal faces 

 sloping obliquely inwards so that the outer side is the 

 longer; the next few joints shorter and bluntly wedgeshap- 

 ed. The following ones are longer again, more sharply 

 wedgeshaped and overlajjping , with slight spines on their 

 distal edges. The overlap is sometimes so marked that the 

 joints seem to have a sharp dorsal keel with spiny edges. 

 After about the 30th joint they are shorter , blunter and 

 more oblong, becoming squarer and less strongly overlap- 

 ping towards the arm-ends. 



First syzygium on 3rd brachial; the next between 12 

 and 17; then an interval of 3 or 4 joints between success- 

 ive syzygia. 



The second joints after the first (radial) , and third (palm- 

 ar), axillaries bear slender pinnules of moderate length, 

 the first of which is slightly the longer. The next pinn- 

 ule which is on the second brachial (except when there 

 is a sixth ray-division) is a good deal shorter , and that 

 on the fourth joint still more so. The next six or eight 

 pinnules (5 to 10 or 12 br.) are a little longer, consisting 

 of 15 more massive joints, the lower ones of which are 

 trapezoidal with their outer distal angles produced into 

 short processes. The following pinnules become gradually 

 longer and more slender, composed of longer joints still 

 retaining processes on their outer sides and fringed with small 

 spines. The lower pinnules as far as the 4th brachial 

 have a small terminal comb, which occurs also on some 

 of the laiger pinnules immediately following. 



Disc lost; diameter across the radials 13 mm. 



Spread about 25 centim. 



Colour blackish brown. Locality unknown. 



Notes from tUe Leydeii IVLuseum, "\'"ol. Ill, 



