510 MK. P. H. CAEPEISTTER OK NEW 



immediate predecessors, thoiigli somewhat larger aud stouter tban 

 that on the second brachial. "W here no distichals are present, 

 but the radial axillaries bear arms directly, the fourth pair of 

 pinnules are large like their immediate predecessors. The size 

 decreases to about the fifteenth joint, and then increases very 

 slowly again, the outer pinnules only reaching about one third 

 the length of the largest lower pinnules, which have wide and 

 strongly keeled basal joints. On the smaller pinnules after the 

 fifth pair this cariuation is less marked, but it is traceable for 

 some little way out on to the arms. 



Disk naked and considerably incised, 15 mm. in diameter. 



Colour nearly white, with traces of a deep violet remaining. 

 Sacculi very close along the pinnule-ambulacra. 



Spread about 25 centim. One specimen sine patria. 



Hemarlcs. — This fine species diff'ers from all but two of those in 

 the Savignyii group in the great length of its cirri, which are only 

 exceeded hj those of Ant. JEschriclitii, Ant. phalangium, &c. ; and, 

 despite their length, they are remarkable for being in a compara- 

 tively undeveloped condition. The terminal claw is very small 

 and but slightly curved, without any trace of an opposing spine, 

 which is just the condition of the immature cirri of other species. 



There is an Antedon from Sydney in the University Museum 

 at Copenhagen, bearing the MS. name of Ant. austmlis, Liitk., 

 which has some resemblance to Ant. acuticirra. With the same 

 arrangement of the ray-divisions, it has a few long and many- 

 jointed cirri and a large third pair of pinnules ; but it has rela- 

 tively shorter axillaries and a shorter syzygial interval, usually 

 6-8 joints instead of 10-15. Without a more detailed examination 

 of the Copenhagen specimen than I have as yet been able to make, 

 it is difficult to be certain as to its identity with the one which 

 I have described above as Ant. acuticirra. 



8. AlfTEDOlS" LUDOTICI, U. Sp. 



Description of an Individual. — Centrodorsal a thick disk with a 

 flattened dorsal surface and a single or partially double row of 

 25 marginal cirri. These have from 40-50 tolerably equal jointSj 

 all of which, except those at the extreme end, are wider than long. 

 Even in these terminal ones the length is but little greater than 

 the -width, and there is a slight tubercle in the middle of the 

 dorsal surface, which is most marked on the penultimate joint; 



Eirst radials partially visible; the second short, widely oblong, 

 almost completely united laterally, and slightly raised in the 



