124 VERRILL 



pedicellariae. A few small, long-ovate, compressed major pedicel- 

 lariae occur on the actinal interradial areas and along the edges of the 

 grooves. The papulae stand singly or in groups of two to four. 

 Madreporic plate small, prominent, with few gyri, pale orange in 

 alcohol. 



A smaller specimen (pi. ix, fig. i ; pi. xvu, fig. 2), taken at the 

 same place, was also preserved in alcohol. The dorsal spines already 

 form five distinct rows, with others between them ; the median row is 

 conspicuous and its spines much larger than the others, with rounded 

 tips. Wreaths of minor pedicellariae are much smaller and not in 

 contact generally. Lateral and ventral spines longer and in very 

 regular rows. Madreporic plate is pale orange in alcohol. In life 

 the color was uniform iron-rust color (Coe). 



The types described are from Berg Bay, Alaska, in ten fathoms 

 (W. R. Coe, Harriman Expedition, June 10, 1899). 



This species bears a general resemblance to L. tenera (St.) of the 

 New England coast, but the dorsal and marginal spines in the latter 

 are far more numerous, much smaller, and acute; it very rarely has 

 six arms, and its dorsal ossicles are much more numerous. Typical 

 specimens of L. mulleri from Greenland are still more closely allied, 

 but the latter is a five-rayed species, and also has more slender spines 

 (though not so slender as in L. tenera), and has fewer pedicellariae, 

 somewhat different in form. 



LEPTASTERIAS MACOUNI Verrill, sp. nov. 



Rays six, elongated, slender, rounded and evenly tapered. Radii, 

 8 mm. and 41 mm. ; ratios, i : 5. Dorsal ossicles thick but small, with 

 large papular pores between them; median row thicker, forming a 

 slight carina; others reticulate. Dorsal spines slender, small, scat- 

 tered or in several obscure rows, except the median radial row, which 

 is distinct, consisting of small clavate spines, mostly standing two to 

 a plate, in nearly simple lines. Similar spines cover the disk. The 

 larger intermediate dorsal spines are rather smaller, slender, tapered, 

 subacute, mostly one to a plate, arranged somewhat in quincunx, or 

 in about three irregular rows on each side, the larger papular areas 

 forming oblique rows of three on each side. Some minute spines 

 stand on the transverse ossicles. 



Superomarginal spines distinct, larger and longer than dorsals, 

 obtuse or a little clavate, forming a simple regular row. Infero- 

 marginal spines are of similar length or a little longer, subacute, 

 mostly two to a plate, forming two alternating rows. 



