OB LITTLE-EXOWN COMATULil'\ 519 



duced into slight keels?. Tlie largest piuuules are those between 

 the 10th and 25th brachials, and a little further on they become 

 more slender, with squarer joints, the terminal pinnules having 

 somewhat elongated joints. 



Disk 25 mm. wide, without any trace of calcareous deposits. 

 Colour of dry specimen black. Spread probably about 25 centim. 



One specimen from Australia. 



Beviar/cs. — The above description is based upon a couple of 

 dry specimens, oue of which is in the Hamburg Museum, and the 

 other now in the possession of Dr. Carpenter ; they were both 

 purchased originally from the Messrs. Godeftro}'-, for whom the 

 type had been named by Dr. Chr. Liitken, of Copenhagen ; but 

 he has published no description of it, and informs me that he 

 does not intend to do so, being now occupied with another branch 

 of zoology. Specimens of the type, bearing his MS. name, occur 

 in a good many museums ; and I have therefore thought it unde- 

 sirable to rename it. 



Act. rohusta has a considerable resemblance in general appear- 

 ance to Act. Solaris, both species having large arms composed of 

 massive triangular joints with curved edges, and stout pinnules 

 of broad joints. The arm-bases of Act. Solaris, however, are 

 nearly or quite smooth, and have little tendency to alternate tu- 

 bercular elevations such as are visible in Act. rohusta ; in the latter 

 species, too, the width of the arms increases more distinctly in the 

 first few joints than in Act. Solaris, while the second and third 

 pairs of pinnules have no expanded keels on their lower joints 

 such as appear in Act. Solaris, and the cirri are larger and more 

 numerous. 



3. ACTINOMETKA PARTICIEEA, MlllL, sp.* 



Two specimens of a small Actinometra from Peru must, I think, 

 be referred to this species. I can find no characters by which I 

 can separate them from any one of its various forms that inhabit 

 the Eastern seas. One of them is very small, and has lost its 

 disk, but the other is larger and more perfect, though wanting 

 some of its arms. The mouth is not quite so distinctly inter- 

 radial as in the Philippine specimens, whicli I have describedf as 

 Act. polymori^ha, but there is the same dimorphism of the arms. 

 All are grooved, but the grooves on the posterior arms are much 



"^ The literature of this species will be fouud on p. 204 of ' Notes from the 

 Leytlen Mxiseuui,' vol. iii. 



t Trans. Linn, Soc. 2ncl ser. Zool. toI. ii. pp. 2'J-ri3. 



