196 RKCKNT MADKKPOKAKIA OF TIIK HAWAIIAN ISLAND WAND LAYSAN. 



Calic-os polygonal, cxciivatod. rather dc^op, diaiiicUT from 1.25 to 1.5 mm.; sepa- 

 ruti'd by elevated, .-simple, perforate walls. Mural denticles rather tall, niimitely 

 frosted, about twice as many to a ealice a.s there are septa. 



The septa usually hoglu a slieht distance below the upper edg(> of the wall. 

 Between a palus and the wall, there is usually a single septal trabecula, termi- 

 nating al)o\e in a septal granule, usually not prominent, and slightly detached 

 from the wall. Rough radial denticles may be present on both the mural and septal 

 trabecula'. There is an iucomj)lete pcriiiheral ring of synapticula, no distinct nuual 

 shelf. Septal faces frosted, often rather densely and coarsely; interseptal loculi not 

 not very wide, f re(|uently tend to be decidedly narrow, and may appear closed. 



Pali tall, slender, niorc or less lath like; the formula complete; joined by a 

 complete ring of synapticula. 



Columella tall, a nai-row laniella. joinivl liy tluck radii to the innei ends of the 

 .septal grou|)s. 



Lomlity.— Pukoo, Molokiii : two specimens collected Ijy Dr. J. E. Duerden ; 1 speci- 

 men, also collected by Doctor Duerden, the locality label has been lost, but it probably 

 comes from the same locality; 1 specimen, received from Dr. W. T. Brigham. 



Type. — American Museum of Natural History, New York. 



Paratypes. — United States National Museum and American Museum of Natural 

 History. 



Remarkn. — The calicular characters of I', pithiensis are practically identical with 

 those of /'. compn'tim foi'ina ir/i(/iif<f/ septet. As was remarked in discussing the latter 

 form, it is not at all uidikely that the_y may be only different growth forms of the 

 same species. However, the specimens at my disposal for study do not show 

 intei-gradation. 



/'. Inlmta ioxxwA. paTvicalyx (p. 200) is also closely related. It forms thicker col- 

 umns, and its calices are smaller. The walls of the two are similar, but usually thej' 

 are taller in /'. luhnta forma piirvicaJy.r. Neither of the extreme conditions was seen 

 in tiic calices of /*. piikoefisis. The septal granules of the latter are not so tall and 

 are not so far removed from the wall; the pali are constantly present and the colu- 

 mella tangle does not become an indelinite mesh-work. 



The three forms, P. coni/zres^a forma angusf/nepfti, P. pi/koen.s/i<, and I', hilxita 

 forma jxirvimly.r constitute a most interesting series. It may be that they all belong 

 to the same species. Should they do so, they will show that the gro\vth form of 

 corals is of only .slight systematic importance. 



6. PORITES LOBATA Dana. 

 I'latc l.XXXI, fic;.s. 1, \a, Ih. (Dana's type.) 



lS4fi. Poritfslohalu Dana, Zoopli. Wilkes Expl. Exped., p. 562, pi. lv, fig. 1. 



ISliO. Pontes lobata Milne Edwahds and Haime, Hist. Nat. Corall., Ill, p. 177. 



1880. Porites IMien Quelcii (not Dana), Reef Corals, Challenger Rept., p. 181. 



1886. Parlies tenuis Qpelch (not \"errill). Reef Corals, Challenger Rept., p. 184. 



1887. Poriles luliiila Rathhun, Proc. U. S. Nat. Mus., X, p. .366. 



1905. Poritex hcnvnietiifii: tertia Bernard, Porite.s, Indo-Pacilic Region, p. 100. 

 190.5. /V'Vfs 7(oiTOi>HSi>.sc.i(<f Heknard, Pontes, In<lo-I'acifip Region, ]). 103 jil i\ iig. 9; pi. xii, 

 fig. .=>. 



1510.5. Porlleshaumauhoclaiii Bernahd, Porites, Indo-Pacitic Region, p. 105, pi. x, tig. 2. 



