TU'IJ.ETIN r,\K I'NITKI) ^<TATES NATH l.\ AI. MTSKUM. 203 



The invi^ulai'ly domed liiiiiii>y upper surfiice and the down liendirif^ of tlir li\ing' 

 edge !<ei)arate siibforma />' fn fi-oni suhforma aljilui. 



LocaUt'iiH. — Waikiki. Oalui, .1. !•",. nuei-den. cullcctoi-: Kaliatia. Oaliii, W. T. 

 Urigliain. 



T;/j>-'. (\\{. No. liditL'T. r.S. N..M. 



PORITES LOBATA forma CENTRALIS .subforma GAMMA, new. 

 Plate l.XXXIV, fi- 2. 

 IS.SU. J'oritcs tenuis liuELcii, part (not Verrill), Reef Coralf, Challenger liepte., |). 1.S4. 

 1905. I'oriles hawaiengix oclavu Bkh.vahu, Porites Indo-Pacilic Region, p. 105, pi. x, fig. 2. 



Tlic iipi)er surface of the corullmii i^ rounded or flaltisli, more or les.s undulate, 

 but witliout luuiips. 



Tlie peripheral rinjr of s\ iiapticula is usually coiuijlete, the wall rising as a 

 beaded ridge above and l)et\v(>en the rings. Subforinie gainma, delta., and epnUim 

 dirter from eaeh other chiefly in the configuration of the upper surface of the 

 corallum. 



The following is a somewhat detailed description of the specimen figured, 

 riute J.XXXIV. figures: 



Corallum attached, edges epithecatc, rounded above, upper surface undulate. 

 Greater distance across, 57 nun.: lesser, h'l mm.; thickness, 87 mm. 



Calices moderately deep, polygonal, diameter from (•.!• to 1.7 nun., an average of 

 47 calices was 1.28 nmi. ; of the 47 measured, 22 had a diameter of 1 M or 1.3 mm. In 

 the <lepressions on the surface th(\v are smaller 0.9. or even less, to 1.1 mm. indiame- 

 tei'; oTi the elevated portionsof the surface they are larger, 1.5 to l.(i nun. in diameter; 

 with occasionally one as much as 1.7 nun. i n diameter. The eorallite walls are elevated, 

 perforate, and usually thin; there is, however, fre(|uent thickening in the corners of 

 the calices. The-^e thickened and often elevated ai'eas constitute a striking character. 

 Very near the wall there is a ring of .synapticula and the septa arc peripherally 

 somewhat thickened. 



The septal arrangement is as already desci'ibed. 



Localities. — Pukoo, Molokai, depth .3 to 6 feet, received from W. T. Brigham; 

 Waikiki and Kaneohe. Oalui, Dr. J. Vj. Duerd<Mi. collector. 



7}//".— Cat. No. :il<i-it;, U.S.N.M. 



Bernard has redescribed in detail the specimen referred by Quelch to /*. fenui.i 

 Verrill under the designation of Piir'i1i>t hmixiienxix ocfovii. It is heiv ]ilaced in sub- 

 forma ijiniiiiM. The follow ing is Bernard's description: 



The corallum closelj' incnista stones with a layer about 5 mm. tliick. Successive layers of the 

 same tliiokness cover one another, and can he scaled off. Edge.'^ closely ailherent. 



The calicle.s are sui>erli( ial, polygonal, and 1.5 nun. acros.s if taken from median ridge to median 

 ridge, l)ut round and 1.25 mm. if the circumference of the inter.'^eptal locnli is the j«?ripliery of the 

 calicle. The wall has a low frosted or tinely tootheil median ridge, and a Haky .shelf on each side of it. 

 lli^re and there the shelf is very porous, and the wall appeal's to l>e reticular. The rows of the [wres 

 are siimelinies nearly regular enough to suggest the trimurate eonciition. (See Introduction, p. Ki.) 

 The septa arc^ymmetrical, hut slightly roughened, and septal granules appear at the edges of the flaky 

 shelf. The inlerseptal locuii are conspicuous and o|ien. The pali form a neat ring, and are frecjuently 

 complete. The eolumellar tulx-rcle is granular and smaller than the principal pali and slightly helow 

 their level. Itself selilom flattened, it may fre<|uently be seen to rise from a directive lamella running 

 across the whole calicle. 



