366 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



2- jawed broadly lanceolate pedicellaria often btands at the adoial 

 end of the subambulacral series. The outer margin of plate, ju>t 

 back of the subambulacral series, is occupied by low granules with 

 frequently a pedicellaria composed of 2 stout subconical, granuli- 

 form jaws. 



Mouth spines 12 to 15, the inner the heaviest, the outer a little 

 larger than adjacent adambulacral spines; suboral spines swollen 

 and wrinkled at tip, 4 or 5 to each plate, in a series parallel to 

 subambulacrals. Back of these 1 to 5 enlarged granules may be pres- 

 ent, representing a second suboral series. The outer part of the 

 plates is coA'ered with mostly irregular l:-sided granules, continu- 

 ous with those of adambulacrals, and also those forming a zone 

 around the proximal actinal intermediate plates. Sutures of mouth 

 plates not visible. 



Madreporic body ovate, flat or slightly concave, with numerous 

 fine radiating striae, situated one-fourth the distance from center to 

 suture between superomarginal and inferomarginal plates. 



Color in life, maroon red on ventral surface; darker on dorsal 

 surface. 



Gonads in numerous tufts parallel to interradius; the hepatic 

 coeca are relatively small, and each is situated close to the inter- 

 brachial septum. 



Tijpe.—CaL No. 32634, U.S.N.M. 



Type-locality. — Station 5165, 6.4 miles southeast of Observation 

 Island, Tawi Tawi Group, Sulu Archipelago, 9 fathoms, coral; 2 

 specimens. 



Distribution. — Known only from the type-locality. 



SpeoiTnens examined. — Three; besides the type, one without lo- 

 cality. 



Remarks. — Halityle regiilaris will not be readily confused with 

 any known species of Culcita. Doderlein in his revision of Culcita 

 (1896, p. 315) reduced the number of species to 5, namely schmide- 

 Iia?ia, novae-guineae, grex, coriacea., and veneris. The last two may 

 be eliminated, as they have the papulae uniformly distributed over 

 the dorsal surface. The first 3 species have small spines or tubercles 

 on either the papular areas, or interpapular areas, or both. All the 

 species have the marginal plates obscured, except when young. In 

 //. regidaris., on the contrary, the marginal plates are distinctly 

 visible, although not especially conspicuous, there are no spines or 

 tubercles on the abactinal, marginal, or actinal intermediate plates, 

 and the papulae are in very regularly arranged triangular areas, 

 resembling those of Oreaster. The actinal plates are conspicuously 

 tessellated. 



