84 KKCKNT MADREPORAKIA OF THE HAWAIIAN ISLANDS AND LAYSAN. • 



iiiv imuh iiioi-e cxsert tlnin in llio Havvaiiiiii species, and it presents a decidedly 

 smoother aspect than t/nral>il/f<. 



M. hniaie7isi.s shows a considerable amount of variation. The types, live speci- 

 mens, countiiifr fragments. Station 3982, were selected from a rather large amount of 

 material, which may all belong to one colony. These specimens are rather constant. 

 The calices vary in size as expressed in the description, and sometimes they are sunken 

 or they may occasionally be somewhat swollen around the base. The specimens from 

 Statioii 383S have the calices rather constantly swollen at the base, but they are not 

 prominent and there is no e!t;vated thecal rim. 



Some of the specimens from Station 3833 apparently should ))e varietally 

 separated from the other specimens. 



MADRACIS KAUAIENSIS var. MACROCALYX, new variety. 

 Plate IX, figs. 4, 4<i. 



Tliis variety usually has larger calices than typical specimens of the species, the 

 diameter is frequently as much as 2 mm. and sometimes may be 2.5 mm. The 

 calices may be swollen at the base, sometimes are elevated: they are also often 

 crowded. The secondary sept;i may ])e very well developed. 



These specimens are only aberrant individuals of Jf. hauaiensits, as ever}' inter- 

 mediate variation is in the collection. 



Locality. — South coast of ilolokai Island, Station 3833; depth, 88-142 fathoms; 

 bottom, .sand, pebbles, broken shells, rock: temperature of bottom, 63° F. 



Type.— Cut. No. 20777, U.S.iS'.M. 



Family POCILLOPORID.F Verrill. 



Genus POCILLOPORA Lamarck. 



Including the specimens collected by the Alhatro.ss expedition of 1902 and speci- 

 mens received from Prof. W. T. Brigham, of the Bishop Memorial Museum of 

 Honolulu, there are in the United States National Museum over 75 specimens of 

 PttciUojxmi from the Hawaiian Islands. In addition to this material, I have, through 

 the courtesy of Professor Verrill, been able to stud}- the collection belonging to Yale 

 University, and he has generously let the United States National Museum have frag- 

 ments of those species not previously represented in it. In making comparisons 

 with species from the Panamic, South Pacific, and Indian Ocean regions I have utilized 

 the old collections of the United States National Museum, which possesses most of 

 Dana's types, and the Alhatros.s collections of 1899-190( ) and 1904-5. I ha\ e therefore 

 been able to study many hundreds of specimens. 



Professor Dana, in his Zoophytes of the Wilkes Exploring Expedition, reported 

 the following species of FocUlopora from Hawaiian Islands: 



P. ci'Kpitrmi Dana, described from the Sandwich Islands. 



P. h'evkvrnis Lamarck, reported from the Sandwich Islands. 



P. favosa Ehrenberg, reported from the Sandwich Islands. 



P. vci'nicosa (Ellis and Solander), reported from the Sandwich Islands. 



P. Ugulata Dana, described from the Sandwich Islands. 



P. meandrina Dana, described from the Sandwich Islands. 



/'. pliimta Dana, describt>d f lom the Sandwich Islands and the Fijis. 



P. infonnis Dana, described from the Sandwich Islands. 



