A. E. Verrill — Revision Genera and Species of Starfishes. 207 



The actinal plates, when denuded of spines, are numerous, decidedly 

 convex, with deep sutural grooves between them ; their surfaces 

 are covered with uneven irregular elevations, where the spines were 

 attached. They are arranged in about five rows parallel to each 

 ambulacral furrow. The first row extends nearly to the tip of the 

 ray ; its plates are larger and rather more square than those of the 

 next row. The interradial plates become small, rounded and 

 crowded. The actinal plates all bear dense groups of rather stout, 

 elongated, tapered, mostly acute or subacute spinules, essentially like 

 those of the lower marginal plates. 



The adambulacral plates are transversely oblong, rather narrower 

 than the adjacent actinal plates, and have, like the latter, a tuber- 

 culated surface. Each one, proximally, bears two, or more often 

 three, unequal spinules of the furrow-series, but more distally they 

 bear only two, nearly equal ones. On the actinal side each plate 

 bears about four or five quite similar spines, Avhich sometimes seem 

 to stand, more or less distinctly, in pairs. These spines, like those of 

 the furrow-series, are essentially like those of the actinal plates, in 

 size and form. 



The jaws are rather large, rhombic ; the ^wo dentary plates are 

 separated by a rather wide sutural furrow covered with membrane ; 

 they are covered with spines on the margin and actinal side, like 

 those of the adambulacral plates. The median recurved spine is 

 large, somewhat compressed; the distal part is hyaline and very 

 acute. 



A large example has the greater radius SS"^™ ; lesser, 16™™. 

 Another has the greater radius 42™™; lesser, 14™™. 



This species has been taken by the U. S. Fish Commission at 

 many localities, from off Martha's Vineyard to Florida, in 43 to 480 

 fathoms and more. 



It is easily distinguished by the small marginal plates and stout 

 actinal spinules. 



Regularly 4-rayed and 6-rayed specimens have been taken. 



Odontaster setosus Ver., sp. nov. 



Plate XXIX. Figures 1— Ic, 3. 



Form depressed, stellate, with a broad disk. Sides regularly in- 

 curved. Radii about as 1:2, somewhat variable. The marginal plates 

 are pretty well-developed and encroach considerably upon the disk, 

 above and below. They are transversely oblong, distinctly- higher 



