SHALLOW-WATER STARFISHES 143 



more slender, tapered, subacute; they stand in three rows, or some- 

 times four, at the bases of the rays. Of these the inferomarginals 

 stand mostly two to a plate or three to a plate proximally. Per- 

 actinal spines form a simple row, not reaching the tip of the ray. 

 Adambulacral spines small, about half as long as the inferomarginals, 

 very slender, terete, or slightly clavate, mostly two to a plate ; some- 

 times alternately one and two. 



Marginal and dorsal dermal major pedicellariae unusually small, 

 few, compressed, ovate and acute-lanceolate. Many small ones 

 occur along the inner edges of the adambulacral grooves. Minor 

 pedicellariae are rather few on the dorsal spines, but more numerous 

 on the marginal and peractinal spines ; a few are scattered between 

 the spines on the dorsal surface. 



The ambulacral grooves are rather shallow and wide, appearing 

 much more open than is usual in other species of this size. The 

 pores are rather large and not much crowded. 



The mouth is not sunken. The peroral spines are well developed, 

 but rather short and divergent. The apical pairs are rather longer 

 and stouter than the adambulacral, tapered, subacute; those of the 

 exterior pair are of the same form, from one-half to two-thirds as 

 long, and very divergent. The epioral and adoral pairs are dis- 

 tinctly longer than those further out. Three contingent pairs of 

 plates, besides the epiorals, form the adoral carina. The oral spines 

 often bear small oblong-lanceolate major pedicellariae. 



The dorsal ossicles are unusually large and thick for so small a 

 species. They are wide and deeply lobed and are closely and firmly 

 united together, leaving only very small spaces for the papulae, which 

 are few and often stand singly. The larger plates form three longi- 

 tudinal rows besides the superomarginals, which are four-lobed, con- 

 spicuous, and elevated in the middle, like the median radials. The 

 latter are strongly imbricated, and have large lateral lobes. 



The type is from Dutch Harbor, Unalaska (Harriman Expedi- 

 tion). 



This most resembles L. inequalis, except in having six rays. The 

 comparatively large and thick dorsal ossicles, angular rays, open 

 grooves, and general appearance of the type indicate that it may be 

 the young of a species that grows to a much larger size, but I know 

 of no species to which it could be referred, unless it be another of the 

 numerous varieties of acervata or epichlora. But it differs widely 

 from all those forms of the latter, that I have seen, in the large, 

 lobate, dorsal ossicles, arranged pretty clearly in three longitudinal 



