15U KKCENT MADKKl'OKAKIA OK THE HAWAIIAN ISLANDS AND LAYSAN. 



Upper septal iniir<.nns usually eutiio; they arc not exscrt at one end of the calice and 

 are moderately exsert at tlie"otlu>r. Inner margins irregularly and coarsely dentate. 

 Septal faces minutely striate, small granulations along tlu^ striiv. 



Calicular fossa elongate, narrow, and deep. 



Columella moderately developed, trabecular, and spongy. 



Zom/fiii/eA'.— South ccmst of Molokai Island: Station :isi';j; depth, 78-222 fathoms; 

 bottom, tine sand, pebbl(>s; temiu-rature, (iii F.; specimen Ko. 2 and 2 young. 



Northeast coast of Hawaii Island: Station 4061 ; depth, 24-83 fathoms; bottom, 

 coral sand, corallines, nodules, foraminifera; temperature, at the surface, 77° F; 

 specimen No. 1 and 1 attached young. 



%?e.— Station 40(il, Cat. No. 20824, U.S.N.M. 



liemarks.— This coral is so extremely close to BalanojyhyUia (lesmophylliun 

 Milne Edwards and Haimc of the English Eocene, and also very abundant in the 

 p:iocene of the United States, that I can not point out very satisfactory differences. 

 The size, shape, and the numlier of the septa are the same in both. The columella 

 in B. desmophijllum is better developed, and its costa; and septa are thinner. These 

 differences could very easily be obliterated by only moderate variation. In B. des- 

 mophyUi(nde>i the principal septa (first, second, and third cycles) are simple lanunw; 

 in B. dawiophylUim, near the wall, they become thickened and very vesiculate. In 

 the former there is tendency toward the same phenomenon, but it does not seem to 

 be carried so far. 



A greater number of specimens of the Hawaiian coral maj' show more satis- 

 factory differential characters, or may show that the Eocene species has persisted to 

 recent time. Which(>ver may ultimately be found true, it is interesting to obtain 

 a recent species so closely related to one that is an Eocene fossil. 



This species al.so seems closely related to the recent B. hairdiana of Milne 

 Edwards and Ilaime. 



BALANOPHYLLIA LAYSANENSIS, new species, 

 riiiti' XLV, tigs. L', 1'.', -lb. 



Corallum evidently attached by a broad base (the base is broken off), above 

 which is a thick, solid stalk; above this the corallum expands gradually. Transverse 

 outline (dliptical. (jrreater diameter of calice, lti.5 mm.; lesser, 13 mm.; height of 

 corallum, 17+ nmi. 



Wall entirelv devoid epitheca, thick, verj' perforate, Ijoth on the costffi and in 

 the intercostal furrow. Costw of two sizes, those corresponding to the tirst and 

 second cycles of septa decidedly the larger and of equal size; those corresponding to 

 the third cycle not so prominent, but are well develojjed. The distal ends of the 

 fourth cj'de of .septa are easily traced, Ijiit form flat areas between the costa;. The 

 co.sta} are wide, round or llattish in profile, and ver^' perforate. They are more 

 prominent near the calic(> smd disappear on the stalk above the base. 



Septa in four complete I'ycles, very regular in their arrangement. All are 

 thickened in the thecal ring, where they are spongy, becoming thinner toward the 

 center. The tirst and second cycles of equal size and independent of septal groups. 

 The members of the fourth bend toward one another in front of those of the third; 



