\C^2 RKCENT MADRKI'aKAKI A ()K THK HAWAIIAN ISLANDS AND LATSAN. 



Difertriit fi/riK.s atisuiiiidjiy tin curiillii : 



((. A horizontally oxtcndcd lamina, with wide, tree ^'dg^.\ base epithecate or not. 

 (Plate LIII. tigs, 'i, 4. -2 specimens with epithecate bases; Plates LIV. LV, two 

 views of till' same sp(>cimcn, caiices bifacial.) 



h. Incrustinjj. Mpi)er surface irregularly nodose. (Plate LIII. tig. 1.) 



r. Licrusting, with llie Modulations of the upper increasing in height. 



i/. i?ase incrusting. hut sending up stout columnar processes. (Plate LVI.) 



(. Base incrusting, tlie ascending processes of smaller size, but much fused at 

 the tops. (Plates LVUI, LIX.) 



/. Base small, incrusting, small ascending pi-ocesses originating at an early- 

 stage, but even then there is a pronounced tendency for the upper ends to coalesce. 



Specimens of the growth form designated ''«,'' with the epithecate base, were 

 found at Stations 3H!tH. in the vicinity of Kauai Island, and iO^A, oS the northeast 

 coast of Hawaii Island, at a depth ))etween -Jit and 50 fathoms. Specimens of this 

 particular form were not collected elsewhere, and the greater depth may have had 

 some intluence. The specimen with bifacial caiices, the growing edge having been 

 retlexed o\ er the base, was collected in shallow water, 3 to 6 feet, at Kaneohe, Oahu. 



Those of growth form "/''" were obtained at Stations 4147, 4158, and 4163, in 

 the vicinity of Modu Manu, at depths between 20 and 40 fathoms. All of these 

 specimens are small, and the greater depth may have exerted an intluence. 



(irowtli forTu '"/■" is represented by the specimens from Pukoo, Molokai, depth 

 ;i to •! feet. 



(iri-owth form '"</" is represented by specimens from Kanaha and Kaneohe, 

 Oahu, and Kaunakakai, Molokai. 



Growth forms "t'" and "./'"' are from Kan«ohe, Oahu. 



Four localities have more or less peculiar growth forms, namely, the vicinity of 

 Kauai Island, the northeast coast of Hawaii Island (" »," epithecate base); vicinity of 

 Modu Maim Island ''/>"; Pukoo, Molokai "c". Pukoo can be thrown out, as form 

 "(;"' grades direc^tly into "rf." As already intimated, the greater depth at the other 

 localities may ha\e retiirded the growth and may be responsible for the smaller size. 



Variation in the coarnene^iK of the cifnenchymal nurjface reticulum : 



The reticulum of the ccenenchymal surface may be fine and somewhat compact, 

 or rather coarse and open. There is absoluteh' no correlation between the fineness 

 or coarseness of the reticulum and growth form. Every kind of growth form 

 appears with either kind of reticulum: they may grow alongside one another, and 

 some specimens show an intei'gradation from one kind of reticulum to the other. 



Variation in. the papille: 



The papilla' on flat surfaces, except on the terminals of fused processes, are 

 nipple shaped, and in general precisely fill an interspace between caiices, as remarked 

 by Bernard. Near the growing edge of a lamina they usually incline outward, and 

 the outer end may fall abruptly into a calicular fossa. On the sides of processes, 

 especially the more slender ones, the papilhe f reijuently assume the form of hoods or 

 lower lips to the caiices. 



The pa])illa' on th(> fused terminals of the processes, if the ccenenchymal reticulum 

 is tine, are compressed nodules, with steep sides and rounded upper surfaces, the 



