BULLETIN 59. UNITED STATES NATIONAL MUSEUM. 211 



Culumi'llu not Miiikcii. tcriiiiiiali'd liy :i \civ siii;iil coiiipressccl tubercle. 



Locality. — Aiuiii Chaiiiu'l. lictwt'in M;iui:inil Luiiai islands. Station 3870; depth, 

 28 to 43 fathoms; lK)ttuni, sand. <::i-av('l: icnipciutiiri', 74.ii F.; 1 s]iefitnon. 



7y/>e.— Cat. No. 21«2;5. U..S.N..M. 



Rem.arJ,-fi. — This species needs only to he compared wilFi /'. lohntti. It differs 

 from that species, first, by its size and stibspheroidal form; second, its shallower 

 calices, its septa have not a narrow upper and outer portion, but slope o-iaduaily to 

 the bottom of th(^ calices: third, its si'pta arc nnu-h thicker, and the interseptal 

 loculi ccu'respoiidingly much narrower; fourth, liie pali arc more insiuniticant. and 

 are moie closely crowded around tiie columella; lifth. the columella is not situated 

 in a pronounced depression, as in /'. Inhnlit. There is still another difference which 

 to be bro\ioht out necessitates an addition to the desciiption. The laterals on the 

 sides of the \ entral directive in /'. Jnhnta very constantly have free inner margins; 

 usually the}' do not even curve toward the directive. The usual condition for P. 

 sfiiihri has been descrilied above, but there is some variation. The innei- ends of 

 the laterals in the triplet sometimes, or rather often, approach the ventral directive, 

 and occasionally one of them fuses to it near the columella. There is in /'. stiideri 

 some indetiniteness in the relations of the ventral directive and its two laterals; the 

 condition is intermediate between the one in which the iiuiei- ends of the septa of the 

 triplet are entirely free from one another and that in which the\- are definitely grown 

 toijcther. 



II. PORITES BERNARD!, new species. 

 Plate I.XX \V, figs. 2, 211. 



Corallum small, tuberose, incrustiny nodules, which it ultimately completelj' 

 envelops. A basal epitheca. extending to the growintr edge, can lie seen where the 

 object to which the colony is attachi'd has not been entirely covered. The following 

 are the three dimensions of the largest specimens: .56 nun.. 3.5 mm.. 'M mm. There 

 are two smaller specimens. 



Calices superficial, small. 1 to 1..5 nun. in diameter. When the surface has not 

 been damaged usually no definite bounding walls can b(^ seen, septo-costse connecting 

 adjoining calices. Occasionally there is a discontinous raised line around a portion 

 of acalice. In those places where the up]ier edges of the septa are i)roken down a 

 thick compact wall, composed of the thickened outer ends of the .septa and some 

 synapticula is i-evealed. A careful examination of the surface show.s that this thick- 

 ened wall is composed of three vertical zones of synai)ticula: first, one marking the 

 outer limits of eacli corallite; second, two zones of synapticula, one on each side of the 

 first and verj' near it. The wall is morphologically similar to that of P. studeri, but 

 has not the elevated edge of that species. 



The .septal arrangement is somewhat variable. TJie usual scheme is four lateral 

 pairs, a dorsal directive, and a triplet, with its lat(Mals' fused to the ventral directive 

 near the columella. This arrangement is fairly constant; sometimes, however, the 

 laterals of the triplet ap[)ear not to fuse to the ventral directive. Noi-mally there are 

 six small but rather prominent pali crowded aroiuid the columella. These occur on 

 the ventral directive, at the junctions of the lateral pairs and of the septa comi)osing 



