204 KKCFNT MADKKPOUARIA OF THE HAWAIIAN ISLANDS AND LAYSAN. 



This ooral from Ilunoluhi iis ivprcsentea l)y a spirit spcc-imcn and a cleaned fragment which has 

 been scaled off the liviufr layer. The growth form is peculiar and deserves separate description. 

 From the other Ilonohilan I'dnlex it differs not only in method of growth, but in its calicle formation. 

 There are no high membranous walls, and the pali are conspicuous. But, on the other hand, it may 

 be noted that the thin skeletal elements, the oju-n interseiital loculi, and their symmetrical septal 

 formula, is common to all these Ilonohilan coral.s. 



The absence of high walls in this s})ecimon may be an adaptation to a detached life (cf. P. ceyUm 

 9). As the growth is all on one side, liowevcr, the stock, when collected, appears to have been 

 stationarv. 



Mr. Quelch identified this form with /'. Inmix \'errill. But P. tennis was glomerate, whereas this, 

 forming a rounded mass from incrusting a round stone, is really incrusting. The fact that layer covers 

 layer with discontinuous growths separates thi.s from true glomerate forms, in which the corallum 

 thickens continuously. The rest of Doctor Verrill's description is so general that it might apply to 

 almost any njciiiber of the gcmis. 



PORITES LOBATA fornia CENTRALIS subforma DELTA, new. 



riate LXXXII, tig. 2; I'late LXXXV, tig. L 



rppcr siiifiico witli lohes and iiiiuiiiiiiHit'onii elevations, in thi.s respect diflfering 

 frimi siiM'ofiiia </<iii<iii<i, otlnTwise tliey aro very similar. 



'riio following description is based on the tioiircd .specimen: 



Corallinii a head-shaped mass. 187 mm. tall; oreater diameter. 132 mm.; lesser, 

 13U. I'ppcr surface olomerate, wit!) several deep lobations. The iinder.side of the 

 corallum sliows successive growtli layers, tiie edoe of eacli one epithecate. 



Cidiccs polyooniil. from sliolitly less than 1.5 mm. to 2 mm. in diameter, except 

 in the l)ottoms of the depressions wlieii" they may l)ex)nly 1 mm. Calicnlar cavities 

 deep, the septti iiaiiow above and fallino- aluiiptly to the Ijottom. Walls distinct, 

 thin, straioht. 



Septti as ill the oenerai description of the species. The pt^riplieiai ring of 

 synapticula constantly present, but may not idvvays be .seen unles.s the walls be 

 tiroken down. Pali tall, slender, dcbcatc, minutely spinnlose; formula usually I'oni- 

 plete. Columella and cnluiiudhi tanole as idrcady described. 



This forma is represented by two other specimens. One of tiiem shows no 

 indication of attachment on the base, which flares up, and underneath shows by rims 

 successive growth stages. In the other specimens the growth has been mostly 

 upward, lea\iiig successive collars below. 



The walls in the specimen tigured are relatively t.iller than in the other sj)eci- 

 mens. In the latter the peripheral ring of syuapticidti reaches higher up in the 

 calices and lends to jndduce an iiitfamtiral shelf. The calices of the figured speci- 

 men, howcner, are ])articularly interesting as they connect those of the unfigured 

 specimen with tiio.se of siil)forma nlphii. (See Plate LXXXII, tig. 2.) 



Subforiua delfn is very slightly ditlerent from forma epsihm. The ditierence in 

 the ui)per surface will be brought out in thi>_de.scription of the latter. The main 

 dirterence consists in the pali, which are less developed and more rounded in 

 subforma cpsUon. 



LocalltuH. — Reefsat Kaunakaktii. Molokai, AUxitnms, 1902; Waikikiand Kaneohe, 

 Oahu, Pukoo, Molokai, Dr. ,]. E. Duerden; one specimen from Dr. W. T. lirigham, 

 locality label lost. 



7}//«'. -Figured specimen, (^at. Xo. 22244. U.S.N. M. 



