SHALLOW-WATER STARFISHES IO5 



stand either one or two to a plate. A short row of smaller spines is 

 interpolated between the upper and lower marginals proximally. 

 The peractinal spines are like the lower marginals proximally and 

 form a regular row, one to a plate. The adambulacral spines are 

 small, round, blunt, mostly two to a plate, sometimes one in certain 

 parts, divergent and almost concealed by large clusters of small, 

 ovate, major pedicellariae on the inner ones, and clusters of major 

 pedicellariae on the outer ones; many large clusters of major pedi- 

 cellariae are attached to the inner edge of the plates within the fur- 

 row. A few much larger, blunt-ovate, major pedicellariae with 

 finely denticulate jaws, occur on the interradial spaces and between 

 the proximal marginal spines. 



The type was taken off the Arctic coast of Alaska by the 

 U. S. R. S. " Corwin " in 1885, No. 16889 (U. S. Nat. Mus., No. 

 15820). 



ASTERIAS NANIMENSIS Verrill, sp. nov. 



Plate LXI, figures i-ib (dorsal and actinal sides). 



Rays five, long, narrow, tapered, nearly half-round, the height 

 about equal to the breadth as dried. Radii, 180 mm. and 18 mm. ; 

 ratios, i : 10. Whole upper surface of rays and disk pretty regu- 

 larly reticulated by the lobed plates and ossicles, each plate bearing 

 a single central terete spine, 1.5 mm. to 2 mm. high, with a blunt 

 fluted tip. These spines, on the rays, are arranged nearly in 

 quincunx, but the median dorsal row is distinct, with the spines 

 pretty regular and close together. The upper marginal row is dis- 

 tinct but scarcely different from the dorsals. Between the upper 

 marginals and the median row there might be reckoned four or five 

 zigzag and irregular rows, but the arrangement is rather reticulate. 

 The dorsal spine-bearing plates are small, with a central boss and 

 usually four or five lobes, giving a stellate form, the lobes united 

 to those of adjacent plates by one or two small ossicles, thus leaving 

 rather large, quadrangular, rhombic, or pentagonal papular areas 

 between them. Large dense clusters of minor pedicellariae surround 

 the bases of all the dorsal and marginal spines, and the outer sides 

 of the peractinal spines. The upper marginal plates are much like 

 those above, but rather stouter and in a more regular row; their 

 inferior lobe is larger and stouter than the others, is shoe-shaped, 

 and joins the upper lobe of the lower marginal plates, usually without 

 an intervening ossicle, leaving a well defined narrow marginal chan- 

 nel with large quadrangular papular areas between them. The 



