•210 KKCKXT MAUREPORARIA OF THE HAWAIIAN ISLANDS A^TD LATSAN. 



The type-specimen is fan shaped, or flahellate. greatest widtli 118 mm. The 

 general aspect of P. riilcnlosa is the same as that of P. lichen., exeept P. Uch&ii is 

 based on a smaller specimen. 



The calii'cs exhibit the same tendency in places to occur in depressed rows 

 lietween elevated walls, l)ut the walls between the calices in the rows were in every 

 case observed distinctly jjresent. The calices of retlculosa are somewhat larger, 1 to 

 'J mm. in diameter. The walls are more solid and the septa are thicker. I could 

 tind no other diHerences between the type-specimens. The septal arrangement, etc.. 

 iire the same for both. It should be stated that the surface of P. retlculosa is con- 

 siderably damaged. If the original surface of the living corallum had been pre- 

 served intact, the septa might not appear so thick. 



Locality. — Fiji Islands. 



Typi.—L\\t. No. 6(53. U.S.N.M., United States Exploring Expedition. 



Milne Edwards and Haime" plac'ed Porites retieulo.m, in the synonymy of their 

 Goniopora? lichen, (Dana). P. lichen, and /'. reticulom may belong to the same 

 species, but I have not seen specimens that invalidate the diHerences above noted. 

 The type of P. liehen is here redescribed in considerable detail; notes are made on 

 that of P. retiexdom; and figures of each are given, so that other students of these 

 corals may be able to dentify them. 



17. PORITES (SYNARiEA) IRREGULARIS ( Verrill). 



1864. Synar;t<i im-ijularii! Vkkrili., Bull. .Mus. Ciuiiii. Ziml., 1, ]<. 4.i. 



Original demription. — Verrill's original description is as follows: 



This -species forms large masses, consisting of numerous angular, clavate, uneven, and crowded 

 branches, often nodose at the ends, and much coalesced, giving a rough eroded appearance to the 

 mass. Cells larger than in the following species [.S. fouoe.ca Verrill] ; pali prominent, slender; colu- 

 mella rudimentary, often wanting. Surface covered with slender, prominent, often toothed granula- 

 tions, which are rather loosely arranged. Color deep umber brown. Sandwich Islands; A. (-Jarret. 



I have seen no specimens of this species. 



18. PORITES iSYNARi^A) HAWAIIENSIS, new species, 

 riate XCI, ligs. 1', 2a. 



The coralhmi is incrusting, upper surface undulate. The type, the only speci- 

 men of the species that I have seen, is thin and incrusts a sawed piece of a Poritid 

 coral that I can not identify: should they be the .sime, the corallum form masses at 

 least several centimeters thick. 



The calices are small, superficial, and se})arated by thicknesses of ccenenchyma 

 eijualing, or in .some instances exceeding, the diameter of the calices. Diameter of 

 calices, 0.5 mm. The c<enenchyma may form low rounded ridges or be almost flat; 

 its surface is densely spinulose. 



The septa show the typical poritid bilaterality. The ventral directive has the 

 inner ends of the lateral septa of its group fused to it. There are six prominent pali; 

 a smaller, thinner one on the dorsal directive, the others are triangtdar in shape. 



"Hist. Xat. Corall., Ill, p. 192. 



