NO. 2022. NEW STARFISHES FROM THE PHILIPPINES— FISHER. 211 



Abactinal tubercles similar in form to those of A. truncatus, but 

 much smaller and much more numerous. Larger tubercles not 

 arranged in evident series, in form resembling inverted truncated 

 cones, the base of the cone being convex, and the truncated end 

 immersed, as it were, in the plate and surrounding by a circle of small 

 bead-like granules. Packed closely among the largest tubercles are 

 more numerous smaller ones of several sizes, more numerous than in 

 A. truncatus. These are clavate, or obovate, more or less irregular in 

 form, and toward the margin of the disk a certain number become 

 slender. The height of an average primary is 2 to 2.5 mm. and its 

 breadth at the top 2.5 to 3 mm. (in truncatus similar measurements of 

 a comparable specimen are 3.5 to 4.5 and 6 to 7.5). Between the 

 tubercles are widely spaced small granules similar to those around 

 the base of the tubercles. Numerous long, very slender, 2-jawed pedi- 

 ceUarise, straight or curved at the end, stand beside many of the 

 tubercles. There are 18 inferomarginals, of which 9 underlie the large 

 terminal superomarginal. The other superomarginals are indistin- 

 guishable from the abactinal plates. 



Type.— Cat. No. 32633, U.S.N.M. 



Type-locality. — Station 5149, off Sirun Island, vicinity of Siasi, 

 Sulu Archipelago, 10 fathoms, coral, shells. 



In both A. elegant and A. tuherculosus the abactinal tubercles are 

 conical, more or less acute, to hemispherical or truncate hemispherical, 

 and R is equal to less than 1.8 r. In A. truncatus and A. helonotus the 

 tubercles are obconical to obovate, broader at summit than base, and 

 R is equal to 2 r. 



HALITYLE, new genus. 



Differing from Culcita in having the marginal plates visible in the 

 adult, and in having the papulae in very numerous, regularly arranged, 

 triangular areas resembling those of Oreaster; no spines on any plates 

 except the adambulacral and mouth plates. 



Type of genus. — Halityle regularis, new species. 



HALITYLE REGULARIS, new species. 



Differing from the species of Culcita- in having well-defined mar- 

 ginal plates in the fully adult, no tubercles or spines on abactinal or 

 actinal plates, and in having more numerous abactinal plates, form- 

 ing a very regular triangular reticulum, between which are triangu- 

 lar papular areas arranged in regular series parallel to the radial 

 series of plates, and much more numerous than in C. schmideliana 

 or C. novse-guinese, or their varieties; R = 133 mm., r = 95 mm., R = 

 1.4 r; form massive, pentagonal with slightly arcuate sides which are 

 perpendicular and formed by the marginal plates and about 1 

 series of adjacent large papular areas with intervening perpendicular 



