iOA ACTINOMETIiA XOVAR GUIXEAK. 



elongating again towards the arm-ends. Tlie arms are 

 dimorphic , those on one side of the calyx (probahly pos- 

 teriorj being shorter, with only 60 — 70 joints, and taper- 

 ing more rapidly than the longer anterior arms with 80 — 90 

 joints. 



First brachial a syzygy, and frequently also the second, 

 especially on those single undivided arms borne by axill- 

 aries which bear dividing arras on tlieir other faces. The 

 next syzygy usually on the 8th or 9th joint , after wliich 

 an interval of two joints, or sometimes only of ones between, 

 successive syzygia. 



The second distichal bears a moderately long pinnule 

 with a well marked terminal comb. The next pinnule (nor- 

 mally) is on the epizygal of the first brachial. Its size and 

 that of the pinnule on the second brachial vary consider- 

 ably, being greater on the outer than on the inner arms 

 of each ray ; but there is a gradual decrease from the first 

 pinnule to those on the fourth and fifth brachials after 

 which they increase again , losing the terminal comb about 

 the 8th brachial. Their cuboidal joints have spiny tufts in 

 the mediodorsal line, and at the distal end of each joint 

 are one or two rather larger lateral spines. Towards the 

 arm-ends the pinnules gradually become more slender, but 

 increase very little in length , their joints becoming oblong 

 and the large lateral spines almost entirely limited to their 

 outer sides. 



Disc lost; some of the shorter arms have only an im- 

 perfect groove and tentacular apparatus , or none at all. 



Colour, skeleton greyish white; the perisome a darker grey. 



Spread, about 180 centim. Diameter of calyx measured 

 across the radials, 10,5 mm. 



Locality, The Island of Eidouma, New Guinea. 



Coll. Sal. Muller. 



Remarks. The above description differs considerably from 

 that which was drawn up by Muller on the basis of Tro- 

 schel's examination of this specimen. He is not very clear 



rWotes from the Leyden Museum, Vol. III. 



