BTLLETIX 59. TNITED STATES NATIONAL ML'i=iEUM. 201 



The walls iii-f sti-aiylit. tall, ratiuT thick, witli i-allier thick, rather tall, rcijiilar, 

 slightly frosted detitatioiis corrospoiiding- to the septal ends. The septa begin a con- 

 siderable distance Im'Iow its upper edge, usually obsolete on the elevated portion. 



Each .septum has between the palus and the wall one trabecula. terminating 

 superiorly in a septal granule, deta«-hed from the wall and of very varial>le height. 

 Two processes may project from the septiil trabecula, and there may be processes 

 from the nuiral trabecula. There is always indication of a peripheral ring of 

 .synapticula joining the se])tal trabeculre, but it is rarely cm- never complete. When 

 present it is detached from the wall. The septal faces arc roughly granulate; iiiter- 

 septal loculi open. 



The pali may be tall, narrow plates, and occur in the conmlete fomiida- surfaces 

 rough. Palar ring of synapticula sonietinies complete. 



Coliunella a narrow lamella, situated in a \nt suiTounded l)y the pali, joined to 

 the septa by radii. The tangle usually open, not much compacted. 



The condition described in the {)receding I'emaiks is the one in which the skelatal 

 elements show their extreme ditlerentiatioii and their gicatest ilcvelopment. Other 

 calices diverge considerably from the scheme presented. 



The walls are uuifoi'inly tall and the mural d(>nticles are very constantly as 

 described, but fre(|uently not only are the pali absent but tht^ j)alar trabaculiv seem 

 to be suppressed; the columellar lamella may be indistinct or absent, and the colum- 

 ella tangle rei)rcsentcd by a loose indetinite meshwork. .\ll of the interiuediate 

 stages between the definite arrangement first described and indefiniteness in the palar 

 and columella development are exhibited on the same specimen. The sunnnit calices 

 have the intramural skeletal elements in their less developed state: the walls, how- 

 ever, are usually tall, and are smoother than near the lower edge of the living por- 

 tion. The two rings of synapticula are partially represented, usually incomplete. 



Locitliti/. — Pukoo, Molokai. received from Hr. A\'. T. Hrigham: AVaikiki, Oahn, 

 J. E. Duerden, collector. 



Type.—C&.t. No. 20923, U.S.N.M. 



Reinarl'H. — Forma /«//vvVv//?/./' passes into Un-\\\iil<icc'r<i. For a comparison with 

 P. pukuennis^ see page llMi. 



PORITES LOBATA forma CENTRALIS, new. 



Plate LXXXII, lit;. :.': IMatc LXXXIII, figs. 2, 2«; Plate LXXXIV, figs. 1, l<i, Ih; Plate LXXXV, 



fig. 1; Plate XC\'I, figs. 1. 2, .i. 



ISSti. Purilex lichm tiiKnii ( n«'t Dana), Reef Corals, Challenger Kciit., p. ISl. 



1881). l'(irili« leimi.t (liEUit (nut Vorrilli, Keef Corals, Cliallciigei Kept., p. 184. 



1905. Poriirs liiiir(ii:)iiiix neilii Hkhnahd, Porites Imlo-Parilic Region, p. 103, pi. ix, fig. !'; j>l. \ii, 



fig. n. 

 1905. Porilen liamiiensis iniura Heun.\rd, Porito.< Imlo-l'aiilic Hogioii, p. 105, pi. x, fig. L". 



A number of specimens are referred to this forma and as the foregoing synonymy 

 shows, Quelch's Porites lichen and P. tenulti are placed in it. The forma is subdi- 

 vided into five subforma', which arc given the names of the Greek letters. The /*. 

 iichen of Quelcli belongs to subforma aJplm and his /*. tenuh to sul)forma (jaiiuna. 



The corallum initially is explanate. thin, and either free or attached. The edges 

 may, oi- may not bend under and by creeping invest th(> lower surface with a layer 

 of livino- sul)stance. Whether the edges do or do not bend under, gives rise to two 



