404 Prof. F. J. Bell on 



Antedon incommoda. 



This species, like A. bulens, does not fall into the groups 

 proj)osed by Dr. H. Carpenter. It appears to be common at 

 Fort Phillip, as several specimens have been sent. Like A. 

 hidens it has pinnules on the second and third brachials and 

 the first pinnule is the longest ; but it is distinguished from 

 A. hidens by the much greater slenderness of the pinnules, 

 the want of stiffness in the arms, which are not markedly 

 compressed, the greater number of syzygies, and the smaller 

 number of cirrus-joints. 



General formula A-. 



a 



Centrodorsal flat, central part free of cirri ; cirri about 

 thirty in number, with about twelve joints ; the dorsal side 

 of the joints indented much as in A. hidens ] most of the 

 joints are longer than broad and have the distal edge projecting 

 and overlapping. 



First radials hidden, second broader than long, not in con- 

 tact, third irregularly triangular, not protuberant. 



Ten arms ; first brachials in contact, longer without than 

 within ; second also longer without than within, but not pro- 

 tuberant ; the third, which are syzygial, are longer within 

 than without. The next two or three are more regularly 

 quadrate, the successors alternately wider on outer and inner 

 sides; but there is not the pronounced overlap that there is 

 in A. hidens. 



Syzygies 3, 8, 12, then every third. 



The first pinnule is the longest, but is not very long ; the 

 rest are rather short and are not so stiff and well marked as in 

 A. hidens. 



Colour white, brownish with two dark bands or dark 

 with central lighter band on dorsal surface ; cirri light in 

 colour. 



Spread about 70 millim. 



Here again we have a species which curiously resembles in 

 many points a form from Torres Straits. 



Actinometra trichoptera. 



This is obviously a very abundant species at Port Phillip 

 and is as yet the only member of the genus that has been 

 sent by Mr. Wilson. I look forward with interest to the 

 arrival of fully grown individuals, as I suspect, from what I 

 have seen of the small specimens that have reached us, that 

 the cirri will exhibit an interesting dimorphism. 



