154 A. E. Verrill—Eevision Genera and Species of Starfishes. 



of spines on the 4 or 5 distal plates ; in others only one ; in some 

 none at all. These variations may occur on different rays of the 

 same example. 



E.— Station 2406. Three examples. 



The two larger are much like those described above. The smallest 

 has the smaller radius IS"^"' ; the larger radius, 23'"'°. It has 12 

 pairs of marginal plates on each side. The dorsal ones are thick, 

 convex or rounded, and some are beginning to swell up in the 

 middle to form tubercles or spines. The distal lower marginal 

 plates show sub-conical elevations, Avhere the spines are beginning to 

 grow. Some of the abactinal plates show an elevation in the center, 

 where the spines are beginning to develop. 



F. — Station 2315, One example. 



Similar in size to the one last described. Ten paii-s of marginal 

 plates on each side. They are of the usual shape and many of the 

 dorsal ones show a central, low, conical elevation or rudiment of a 

 developing spine. The abactinal plates are without evident tubercles. 



G. — Station 2374. Four examples. 



Similar to the last in size. Three have 10 pairs of marginal plates 

 on each sides; the other has 12, Most of the dorsal marginal plates 

 have conical or subspiniform elevations. The abactinal radial plates 

 have 3 or 4 conical spines in a row, nearly like those of adult ex- 

 amples. There is also a central group of spines on the disk, some- 

 times as many as five. 



H, — Station 2370. One, very young, (Specimen figured, PI, xxv, 



fig, 6.) 



The larger radius is 5™™. Six pairs of marginal plates on each side. 



Apical plate broadly triangular. No marginal nor abactinal tubercles. 



Abactinal and actinal plates surrounded by a single series of granules. 



I. — Station 2370. No. 18,457, specimen figured. One young example. 

 Radii 12 and 17™™. Dorsal marginal plates 10 pairs on each side, 

 all short, broad, strongly convex. Ventral marginal plates 14 on a 

 side. Small, slender pedicellaria? with long spatulate blades occur 

 on many of the actinal and abactinal plates. No trace of spines on 

 the abactinal plates, which are finely granulated over the central 

 area, with larger marginal granules; a few very small intermediate 

 ossicles occur between them, each with 1 to 3 small granules. Papular 

 pores are few and small, but scattered over most of the radial areas. 

 The adambulacral spinules are in four longitudinal series; those next 



