1S4 KKCKNT MADKKroKAKIA OK THK HAWAIIAN ISLAND!^ AND LAYSAN. 



Th(> puli iirc point.'d, nmirh, :ind soiiu'wliiit irro<rnliir. The fonmila is often 



coniplctc. 



There are two linos of syii;i])tiriil:i, the outei- or nniral usnally not complete 



and often fused to the walL 



Tlie colunieUa is a small tubercle. 



The skeletal ornamentation lonsist- of rather crowded, short, thick, lilnnt 

 granulations. 



These specimens, two, have a j)eculiariy routjh irregular texture, unlike that of 

 any of the other Hawaiian .specimens. 



Loca/if>/.—Kiineohe, Oahu; depth, 3 to 6 feet; received from AV. T. Brigham. 



Coty/M'.s.—C'At. Nos. I'oHHd, 20951, U.S.N.M. 



Remarks. — This forma intergrades on one hand with forma i/i/is/'/iixruta, on the 

 other with forma u/mci/s. 



PORITES COMPRESSA forma CLAVUS, new. 

 Plate LXXIV, ti(i^^. 1, hi. 



This form is represented by a single clavately shaped column, the basal part of 

 which incrusts a dead fragment of the .same species. Height, &2 mm. ; lesser diameter 

 of base, 15.5 mm. ; greater diameter of middle portion, 18 mm.,le.sser, 14.5; greater 

 diameter of upper eiid, 38 mm., lesser, in constriction, 17.5, greatest width of end 

 lobe, 28. 



Calices polygonal, separated by stout, continuous, elevated walls, about 19 or 20 

 nmral denticles to a calice.' Diameter, from 1.25 to 2 mm., 1.5 mm. the average size. 



The septa are .slightly thicker than the interseptal loculi, which are open. 

 Between a palus and the wall there is one trabecula terminating on the septal margin 

 in a tooth of \aria)ile width and prominence, near or slightly removed from the wall. 

 There is no distinctly developed nmral shelf. The palar synapticular ring is often 

 or usually complete; the outer ring is very rarely complete, but never entirely absent. 



Tlie pali are rather thick, not very prominent, more or less pointed, range in 

 number from six to the complete fornuda, the latter condition, however, is rare. 



The columella is a compressed style, not so tall as the pali. 



The skeletal surfaces with rather few granulations, therefore pi-esenting a smooth 

 appearance. 



Locality. — Pukoo, Molokai; depth 3 to 6 feet; received from Dr. W. T. Brigham. 



Type.—C,?Li. No. 21271. U.S.N. M. 



Remarks. — The particularly solid and smooth appearance of both the wall and 

 septa of this form are especially noteworthy. 



PORITES COMPRESSA forma COMPACTA, new. 

 Plate LXXIV, %s. 2, 2n. 



Corallum compo.sed of rather slender, compressed branches, with obtuse or fla- 

 belliform ends. Some branches fuse and form rather wide plates. Height, 12.2 cm. ; 

 length of free portion of branches, 1.3-4.7 cm.; width, 1.-2.4 cm.; thickness, 

 U. 75-0.9 cm.: width of plate formed by the fusion of branches, 4.5 cm. 



