BULLETIN 59, UNITED STATES NATIONAL MUSEUM. 



lOf) 



Heixar/i's. — Professor Vcrrill has kiiullv loaiiud the type of tlii> species. As 

 his description is excellent, I will add ordy measurements of the calices and emphasize 

 a few charactei«. 



MKASITREMENTS. 



Calice No. 1 is young; fission is in process in No. 5. 



The most striking features of the specimen are the liglitiuv-s of the coraliuni. 

 the ver}' poor development or the absence of the columella, and the laliuiiforni 

 dis.sepiments that form floors for the lK)ttoms of tin- calices. 



Genus FAVIA Oken. 



FAVIA HAWAIIENSIS. new species. 



Plate XXVI, ligs. 3, 3a. 



Corallura is incrusting, and may cover rather large surfaces, as much as 21 cm. 

 across. The upper surface is extremely uneven, corresponding to the configuration 

 of the object of attachment, frequently with irregular projections. Its thickness 

 usually is only a few millimeters, but sometimes there ma}^ be protuberances several 

 centimeters in height. 



The calices are irregularly polj-gonal, subelliptical. or subcircular. They are 

 ver}' variable in size, from about 2 to 6 mm. in diameter. The size of the calices 

 does not seem to depend upon position on the surface, though the more hidden ones 

 are often smaller, probably l)ecause of diminished food supply. The depth is con- 

 siderable, about 2 mm. The walls between the corallites are solid, varving in tliick- 

 iicss from a very tiarrow edge to 1.5 mm. Usually a furrow on the top of the wall 

 indicates the boundaries of adjoining corallites. 



There are three complet(> cylcs of septa and a vai'iablc number of the fourth, but 

 the last seems never to l)e complete. The3are somewhat thicker in the wall, thinner 

 inwardly. Their upper edges are rather exsert, terminating abruptly at the furrow 

 marking the outer limits of the conillites; the inn(>r edges fall steeply to the colu- 

 mellar area. Both the arched and descending portions of the septal margins are 

 finely denticulate. Near the columella are larger and coarser teeth, which are some- 

 times paliff)rm. Endothecal dissei)imeiit,s present in th(> longer corailit^'s. 



The columella is well dcvelop(>d, spongy, formed by the fusion of septal proc- 

 esses whicii project above its upper surface, giving to the surface a papillate ajt- 

 pearaiice. 



Asexual reproduction normally bylission: it appears that thei'e occasionall^'inay 

 be budding around the growing edge and in the angles between tlie corallites. 



LocaUti&i. — I'ukoo, Molokai, '2 specinicns; ^\■aikiki. Oaliu. 1 specimen: depth, 

 3 to »i feet; received fi-oiu W. T. liri'diain. 



