BULLETIN 59, UNITED STATES NATIONAL MUSEUM. 83 



solidly filled. Whether this character is or is not of value 1 can not determine. How- 

 ever, I believe that by poiiitinjf out the tremendous confusion in Duncan's work and by 

 attaching a name to soniethin<j; definite, a start may be made toward uniavelinf^ the 

 tanffle of tlie '' Aiiijjkilieliaf'^ {Miidii'iior»') xtri(it;f. 



Family STYLOPHORID.E Vcrrill. 



Genus MADRACIS M i Ine Ed wards a ncl Hainrie. 



MADRACIS KAUAIENSIS, new species. 



I'late IX. lif.'s, 1, 2, 2o, 3. 



Corallum ramose, branches sliMider, coalescing abundiintly, tips attenuate. The 

 longest branch in the type material is !t2 mm. long (tip broken ofi): diameter at 

 lower end, 6 mm. ; diameter about the middle, 6 nun. ; of broken upper end, 8 mm. 

 Length of one young branch, 22 mm.; diameter of lower end, 3 nun.; at tip, 1.5 

 mm. In cross section the Itranches arc subcirciilar or slightly flattened. The angle 

 of divergence of branches at points of bifurcation is very variable, from decidedly 

 acute angle to almost liSO. 



Calices shallow, diameter from 1 tu 1. J nun. On the very tips of the young 

 branches they are crowded, but inmiediately below the tips they are rather distant, 

 separated liy about the diameter of a calice; on older poitions of the corallum they 

 are still more distant, from once to twice the diameter of a calice. The calices are not 

 elevated and there is no projecting thecal rim. 



There are ten princi})al septa, which extend from the wall to the columella. 

 They are moderately exsert, rather thick, and form a crown around the calicular 

 opening. Between each pair of principal septa a rudimentary .septum can usually 

 be seen. There are costa' corresponding to both the large and the small septa. 



The coenenchyma is very dense. There are twenty costie around each calice, as 

 above noted. Outside of the costate area are rather coarse granulations, often so 

 arranged as to appear to be continuations of the costa?. 



Columella ver\ large, tilling tin' liottom of the calicular ca\ity. Its upper 

 surface maj' rise toward the center and form a dome, or there may be a thick 

 rounded style in the center. 



I.iiridit'ieH. — South coast of Molokai Island: Station 3S3X); depth, iS,S-142 fathoms; 

 bottom, sand, pebbles, broken sIicIIn. rock; temperature of liottoni, ti;-! F. Station 

 3838; depth, 92-212 fathoms; lioKoni. line grav-browii sand; temperature of bottom. 

 67° F. 



Vicinity of Kauai Island: Station ;!!tS2; depth, 40-233 fathoms; bottom, coarse 

 broken c'oral, sand, shells; tem[)crature of bottom, 48. .5- Y. [cotypesj. Station 4135; 

 depth, 225-294 fathoms; l)ottom, tine coral sand; temperature of bottom, 51.4 F. 



Northeast coast of Hawaii Island: Station 40(> I; depth, 24—83 fathoms; bottom, 

 coral sand, coralline nodules, foraminifera. 



Cvtyi>ex.—OAi. No. 21(709, I'.S.X.M. 



Rt'iiiarlx. — This species is very closely related to Madracis m irahllm (Duchassaing 

 and Michelotti) from the West Indies. The most important difi'erences seem to be 

 that in M. iitlt'a}>'dtx the calices are bounded by a short thecal rim which ])i-ojects 

 above the coenenchyma and is especially noticeable on the young branches. ] have 

 not seen it on any specimen of ,1A kiiuaicnsix. The septal mai'gins in .lA mirdbiUs 



