BULLETIN 59, UNITED STATES NATIONAL MUSEUM. 161 



into ncarl}- syiiiiiietiicul, nipple-shaped papill;e from 2 to '3 mm. high and 2 mm. 

 thick. These papilla^ exiu-tly till up an interstice, tiieir walls descending directly 

 into tlio polyj) cavities. Thov arc variously d(M(>lope(l, soiuetiiiios crowded, and 

 irregularly swollen and fused. As the coralluni thickens in the ma.ssive forms the 

 pol3'p cavities fill up with a \(M"y loose open ti.ssue (columella formation) which i.s in 

 marked contrast to that of the solid i-eticulum, which streams so directly upward as 

 here and there almost to suggest the pi-esenc<' of tralu'cuhe. 



Localities. — Vicinity of Kauai Island: 



Station 3999: depth, hetween T and 14S fathoms; liottom. coral sand, shells; 1 

 specimen. 



Northeast coast of Hawaii Island: 



Station 4().'j-l; depth. 2<)-.50 fathoms; bottom, coarse coral sand, corallines; 1 

 specimen. 



Vicinity of Modu Marm. or. Bird Island: 



Station 4147: de])th, 26 fathoms: bottom, corals, corallines; temi)ei-ature, 77.9° 

 F. ; 4 specimens, small hut good. 



Station 4158; depth, 20-30 fathoms; bottom, corals, corallines; temperature, 

 78.3"^ F. ; 1 specimen, a fragment. 



Station 4163; depth, 24-40 fathoms; bottom, coi-als: temperature. 78.1^ F.; 



2 specimens, small but good. 



Island of Molokai, reef at Kannakakai; 4 specimens, 1 of which is large, 22 

 cm. tall. 



Di'. ^V. T. Brigham has sent specimens from the following localities: 



Island of Oahu: Kahana, 4 specimens; Kaneohe, 7 s])ecimens; Island of Molokai: 

 Pukoo Bay, 4 specimens. 



Lay.san: Studer. 



In addition to these specimens there are in the United States National Museum 



3 specimens, two labeled '■'' JilfDiopora capitata Dana, Sandwich Islands," and the 

 other, although without a locality lal)el, is probably from the same localitv. 



Professor Ducrden collected the species at Kaneohe and Waikiki, Oahu. 



Therefore, I have been able to study more than 40 specimens of the species from 

 the Hawaiian Islands. 



lirimirl's. — The variations presented b^- Montipora ijerrucoxa are bewildering, 

 and it appears, as do other species from the same region, capable of onl\- generic 

 characterization. .\n attempt is made to classify the variations and to discover if 

 they Itear any relation to the physical environment imder which the\- grew; and 

 rather elaborate figures are presented, so as at least to show the principal variations. 



Four princii)al lines of variation can lie recognized: 



1. Form and size of the corallum, and the extent of the basal epitheca. 



2. Coarseness of the reticulum of the coenenchymal .surface. 



3. Size and erectness or obli(|uity of the papilla;. 



4. Size of the calices. 



The size of the calices did not seem to promise any adequate return for a detailed 

 study; they vary too much on the same corallum. 



3L':i01— 07 11 



