04 UKCENT MADUKI'oKAlilA OK THK HAWAIIAN ISLANDS AND LAYSAN. 



rower, hut (licy also rciuli the axis; the <|uat.Miiarics urt> narrower and thinner, and 

 do not extend all the way down the coralhnii wail; there may be a few still smaller 

 or nidimeiitary (luinaries. Tlie arehes of the principals extend as high as, or even 

 a littlr beyond, the upper edge of the wall, their inner margins falling perpendicu- 

 larly to the l)ottom of the caliee. The septal faces show coarse transvei'se undula- 

 tions. The interseptal loculi are veVy open, and the wall at the base of the corallum 

 is translucent. Columella trabecular. 



(Jreater diameter at base measured between outer edges of the .septa, 37 mm.; 

 measured between outer edges of wall. 'iS mm.; lesser diameter of caliee, 27.5 mm.; 

 height of corallum, 3.". nun. This is a well-preserved .specimen, probably a few mil- 

 limeters over the av(M-age size. The variation exhibited by the specimens is so small 

 that it does not require compiling a table of measureiiKMits. 



Localiiies.— Previously reported from Indian Seas, 4(Mj-(;0() fathom.s (Alcock); 

 west of Sumatra, tU4 and 6(10 meters (von Marenzeller). 



AlhatrosK Expedition, lit()2: 



Vicinity of Modu Manu, or Rird Island: Station 3977; depth, 876 fathoms; 

 bottom, line coral sand, foraminifera, locU; tempeiature, 3.S^ F. ; 1 specimen. 



West coast of Hawaii Island: Station 4036; depth. 687-692 fathoms; bottom, 

 fine dark gray sand, foraminifera; temi)erature, 38.2'^ F. ; 30 .specimens. Station 

 4038; depth, ()70-689 fathoms; hottom, gray mud, foramiiufera; temperature. 3S..5° 

 F. ; 4 specimens. Station 4o;'.it; depth, (>70-697 fathoms; )K)ttoni. gray nuid, forami- 

 nifera; tempcratur(>, 38.7° F.; 11 specimens. 



This sp(>cies lives around the Hawaiian Islands at a depth between 670 and 900 

 fathoms, on a forainiMif(M-al bottom, either sand or nnid, at a temperature of 38° to 

 39° F. 



Reinarl'x. — The Hawaiian specimens diHer only slightly from those descrilied by 

 Alcock from the Indian Ocean. 'I'lie princi[)al ditierence consists in the pronounced 

 tendencj' of the upper margins of tlie faces of the coralla to be trilobate, as has been 

 descril)ed. This triiobation is lirought about by some of the indt>ntation,s of the 

 .septal margins becoming deeper and others shallower. There is variation in these 

 characters. The Hawaiian specimens might be separated as a local varietj^ from 

 those from the Indian Ocean; V)ut I believe that they .should not be referred to a 

 .separate .species. 



This species, under the name of /•'. laciniatum , has been confused with F. alahan- 

 tn/iii Moseley. There are larg(^ suites of the latter species in the United States 

 National Museum, and I have compared about 170 of these specimens with the 

 Hawaiian .specimens of K deludem. There is some resemblance between the young 

 of F. n/ahasfrum and the ordinary sized specimens of K d>'Iiid,//is. F. ahihasttnnn is a 

 larger species, with thicker walls and usually more thickened .septa, and its lateral 

 edges converge downward at a low angle. But the greatest ditierence between the 

 two is that in F. delndem the septa occupying the long axis of the caliee are con- 

 tiiuu'd downward into highly developed crests. The lateral edges in F. alalnstrHin 

 are carinate, but there are no such crests as in F. ddudnis. Moseley's species seems 

 to me very distinct from the latter, at least a comparison of 48 specimens of the 

 former with 170 of the latter has shown no evidence of interaradation. 



