BULLETIN J9, UNITED STATES NATIONAL MUSEUM. lUl 



Fiuiiily ORHICKLLID.E Vaughan. 



Genus LEPTASTREA Milne Edwards and Haime. 



PrpvioiiH to the present time only one speeies of Lt'pt(ixfr<ii had t)ppn reeojfnized 

 from the Hawaiian Islands, namely, L. xteUnlnfa Verrill. Two foi-ms that do not 

 agree with L. MeUulatti are here added. These, although they are closely related, do 

 not interijiade with each other. 



SYNOI'SIS OF THE HAWAIIAN SPECIES OF I,EI>TASTREA. 



Calices (5 iniu. in ilianieter: 



Septa in 4 cycles L. Melluhilci. 



Calices 2.5 to 4. .3 mm. in diameter: 



Septa in 3 cycles, a few (|uaternaries. 



Primarie.s usually decidedly exsert; primaries and secondaries rea<hing the columella. . />. agasmzi. 

 I 'alices about 2 mm., rarely 3.0 mm., in diameter: 



Septa in ',i cycles. Primaries somewhat exsert: jirimaries and a few secondaries reaching the 

 columella L. hawaiiensif!. 



LEPTASTREA STELLULATA Verrill. 

 1867. Leptastrea stellulaia, Verrii.i.. I'roc. Essex Inst., V, p. .'id. 



Original description. — This species wa.s originally described h\ Verrill, as 

 follow.*: 



Corallum conve-x, iiu-rnsting, with irrefjniar inuniinences, lower surface where free covered with 

 a thin epitheca. Cells large, often 0.2.5 inch, with many small ones lietween them, which are usually 

 consi<lerably exsert, and arise by lateral or marginal budding. Septa in four cycles, broad, with 

 trun<'ate, nearly entire summits, but finely denticulate lielow. The six i)rimary septa are the largest, 

 and thickened toward the center of the cells. The others coalesce at their inner edges. Cost;e much 

 thickened but scarcely prominent above the surface of the interstitial spaces. Texture very compact. 



Sandwich Islands, Yale College Museum. 



Profes.sor Studer" identified as L. delluldtM tw^o small young colonies from 

 Laysan. They were attached to a specimen of Favia rxidis, over which his type of 

 I'(iriti:i Idnnijinnxii had grown (see Plate LXXXVII). The calices of these specimens 

 are smaller than in the type. 5 mm. in diameter, and there are onlj* three cycles of 

 septa, whereas there are lour in the type. Professor Studer regards his colonies as 

 inunaturc. I somewhat duubt the correctness of the determination. 



LEPTASTREA AGASSIZI, new species. 

 Plate X.VV, figs. 2, 2a, 3, 3a. 



Coralluiu forming a thin incru.^tation or small, rounded iiiiisses. The corallites 

 |)roject to a variable extent above the intercorallitc areas, in some instances as much 

 as 1.5 mm. Sube([ual, wide, low, granulate costje present on both the free limbs of 

 the corallites and across the intercorallitc area. 



Calices slighth' excavated or moderately deep. Diameter from '!.'■> to 4.."> lum.; 

 average about :^).5 mm. Histance apart usually somewhat less than the diameter. 



Septa in three complete cycles, with a few quarternaries. The primaries and 

 secondaries reacli the columella. The primaries are the thickest in thecal ring; their 



"Zool. Jahrb. Syst., XL, 1901, p. 402, pi. xxix, fig. 9. 



