BULLETIN 59, UNITED STATES XATION.VL MUSEUM. 85 



Professor Verrill, in his I'olyps iind Corals of the North Pacific Exploring 

 Expedition, 1869, revised tiio Ilawiiiian species of PoilllDporn. He placed Dana's 

 P. breviconuH from then; with P. ccxpitoHa. For the specimens of Dana's P. favosa 

 and P. plicata from the Hawaiian Islands he proposed the name /'. asjyera. For 

 Dana's P. verrucom^ from the same locality, he had pioposed /'. »ohiUx in 1864. 

 The names of the Hawaiian species of this genus, according to Verrill, then were: 



P. meandrina Dana. 

 P. informh Dana. 

 P. frovdvm Verrill, described as 

 new. 



P. CcKspUosa Dana. 

 P. aspera Verrill. 

 P. ■nohiJIa Verrill. 

 P. ligidata Dana. 



Quelch in his C^udlengi r Report, 1886, again reports P. vcrrucom Lamarck 

 from the reefs at Honolulu and recombines Verrill's P. aspera with P. plicata Dana. 



In the present memoir seven species of PocUlopora, two of which are described 

 as new, and live varieties are recognized from the Hawaiian Islands. The revised 

 list of the species and varieties of the genus is as follows: 



P. cespitosa Dana. A. 



P. cespitosa var. tvnilda, new variety. 



P. cespitosa vai". laysancnsls, new variety. A. 



P. cespitosa var. stylo phoroides, new variety. A. 



P. molokensis, new species. A. 



P. modumanensis, new species. A. 



P. liyulata Dana (+ P. aspera Verrill). A. 



P. fmndosa Verrill. 



P. meandrina Dana (+ nohilis Verrill). .\. 



P. meandrina var. nohilis Veri-ill. A. 



P. meandrina var. tuherosa Verrill. A. 



P. infoiinis Dana. 



The species whose names are followed bj^ an "A" were collected by the Alhatross. 

 Every species is represented in the United States National Museum. 



SYNOPSIS OF THE HAWAIIAN SPECIES AND VARIETIES OF I'OCILLOPOR A . 



Corallum forming small clumps (less than 15 cm. in diameter), septa and colnniella variable in 



development 1 • /*. cespitom. 



Branchlets slender, clumps uniformly rounded above, septa rudimentary or obsolete, no coluinellar 



style; calices, 1 nmi. in diameter Id. P. cespitosa (typical). 



Branchlets short, with swollen ends; septa and columella rudimentary or obsolete; calices, 0.4 to 



0.8 mm. in diameter V>. P. ce.yiitosii var. Iwnida. 



Branchlets terete or flattened, clumps irregular in shape; septa and columella varial>le in develop- 

 ment ; calices, 0.4 to 0.5 mm. in diameter Ic /'. (cx/iiVwa var. laysanensif. 



Branches compressed, branchlets often verruciform; septa and columella distinct: calices, 0.6 to 



0.8 mm. in diameter Irf. P- cespitosa var. sti/lophoroidfs. 



Corallum forming rather large, bushy clumps, branches subterete, bending outward. 

 Septa and columella obsolete or rudimentary. 



Verrucje obsolete below, irregularly developed on and near the ends of the branches 



2. P. moiokengis. 



