BULLETIN 09, UNITED STATES NATIONAL MUSEUM. 179 



Calicos polyu'otiiil. with V(>rv doHnitc hoiiiiiliirics; on the summits iind .sides of 

 tlic liviiij;' portions deep, near till' lower edge shallow. The diameter faiiges from 

 0.8 to 2 nun., usually about 1..") imiL 



Tlic wall is elevated, thin, continuous, ffotiuently zigzag. The nmral denticles 

 are delicate, often long, spinulose. about 24 to a calico. 



The septa are thin and fragile, the outer ends thicUei-; inteiseptal loculi wide 

 and oiHMi. B(>tween a p;dus and the wall, from one to throe septul tral)ecuke, 

 depending u[)on the length of the sejitum; two is the usual lunnbei-. Kacli of these 

 trabecuho is terminated on the set)tal margin by a delicate dentation. The outer- 

 most tooth stands from one-fourth to one-third the length of the septum away from 

 the wall, w liich projects considerably beyond its upper end. The outer teeth coin- 

 cide in position with an incomi)li'to ring of synapticula. A s(>cond ^yTiapticidai' ring 

 joins the pali together. 



The pali ai'o thin, fragile, of moderate^ height, pointed oi' truncate; the fornuda 

 is complete. Thev suri'ound a deep. well-lil<e tleprossion. from the l)ottom of which 

 rises a delicate, narrow, spinose. lamellar columella. The upper end of the colu- 

 mella is nmch lower than the level of the ends of the pali. 



The skeletal surfaces are beset with numerous slender spines of variable length 

 and shape, pointing in many directions, and producing a very rough and ragged 

 aj)peai'anco. 



Locality. — Pearl Harbor. Oahu; depth, ;i to t! feet. 



Type.— \^K\lo\^ Museum, Honolulu: fragment. Cat. No. lidlf^s, I'.S.X.M. 



Reiiuirh'i. — This forma is espe<ially characterized l)y its fragile skeletal part> 

 and the peculiar nature of their ornamentation. It is closely related to forma 

 (iiK/untistjifii. being separalile from that forma by its mon> dedicate skeletal structures. 



PORITES COIWPRESSA forma CONJUNGENS, new. 

 I'Uitf LXXI, li-s. L', L'-i. 



C'orallum composed of ascending, irregularly constricted nodulose cohunns, 

 rising fi'om a i-amosc ba.so. .Vs the columns grow upward they become compressed, 

 widen and div ide into thick branches. There is considerable fusion between the 

 branches, even n(>ar the base, but in the up[)er part of the corallmn they fretpKMitly 

 foi'ni wide plates. The columns and [)lates in 1 ho interior of the coralliun ai'o dead 

 to near their summits: but on the outside the living portion, or disconnected li\e areas, 

 mav extend more than halfway to the l)ase. The lower edge of the living jiortion 

 frequently creeps dowTiward o\er the surface of the dead ))art. and further down there 

 are disconnected li\c patches, occurring as incrustations. Height of coralliun, liS 

 cm.: diameter of branches from 1 to 4..") cm.; width of iilatos from -2 to 1.^ cm. 



("alicos polygonal, 1 to 2 nnn. in diameter, usually al)out l.T.) nun.: moderately 

 deep near the sununits, shallow or superficial near the lower edge of the living por- 

 tion; se|)arated by slightly el(>vatod, continuf)Us, .straight walls. There ai'o more than 

 24 small, irregularly shaped nmial denticl(>s to a calico. 



The septa are of variable thickness. Thoy may be thickei- than, or narrower than 

 the intersojjtal loculi; the outer ends decidedly thicker than the inner. Between a 

 paius and the wall there is one .septal trabecula, except near the lower limit of the 



