200 ACTINOMKTIfA TYPKA. 



sive syzygia. Pinnules decrease in length to about the 6th 

 brachial and then increase again , but rarely , if ever, reach- 

 ing the length of the lowest pinnules. Joints of middle 

 and later pinnules very spiny. Mouth usually subcentral 

 and radial, but the ambulacra unequal. Anus marginal." 



No two specimens of this type that I have seen are pre- 

 cisely similar , but they pass into one another so very 

 gradually that it is practically impossible to separate them. 

 Von Rosenberg's specimen from Jobie is an exceedingly 

 fine one with a disc measuring 20 mm. in diameter, and 

 a spread of 25 ceutim. It is remarkable for the great 

 length of its lowest pinnules, the first one reaching 10 

 mm., and also for the great development of spines on the 

 elongated joints of the middle and later pinnules. Their 

 edges are fringed with strong spines , and a still larger one 

 projects forwards and upwards on each side near the dis- 

 tal end of each joint. Loven's specimens from Singapore 

 present the same features though to a less extent. They 

 also have a deeper funnel in tlie centre of the radial pen- 

 tagon and the centrodorsal sunk in it to nearer the level 

 of the radials. The lower brachials are also more wedge- 

 shaped, and their margins are elevated alternately on op- 

 posite sides. 



Some large specimens from Cebu in the Philippines which 

 are preserved in the Zoological Museums at Dresden and 

 Vienna also belong to this species. They do not diflFer 

 much from the type except that the lower pinnules decrease 

 more gradually in size. In the » Challenger" specimen 

 dredged near Fiji the arms are shorter and less fleshy, 

 with less spiny joints, the terminal faces of which are less 

 closely applied than in the type. The basal pinnules are 

 relatively shorter and their joints less spiny; while those 

 of the terminal pinnules are almost smooth and the pin- 

 nules stifFer, so that the arms have a less feathery ap- 

 pearance. 



A Fiji specimen on the other hand , obtained from the 

 Godeflroy Museum has moderately feathery arms and more 



Notes from the Leydexi Muséum, Vol. III. 



