188 RKCKNT MADKKIMRARIA OF THK HAWAIIAN ISLANDS AND LAYSAN. 



are almost entirely iiicrnsted l)y millipores, the larj^est, represented by Plate 

 LXXVl, tig. 2, has both ends broken; lentrth, 13 cm.; greater diameter of lower 

 end, 1.9 cm., lesser. 1 7 cm.: tlie upper end is bifurcated, but both branches are 

 broken off, greater diameter inime(liately below bifurcation, -'A cm.; lesser. 1.65 cm. 

 A lateral is represented, natural size, by Plate LXXVl, tig. 3. 



The calices are polygonal, shallow or superficial, ranging in diameter from 0.75 

 to 2 mm., with an average of about 1.5 mm.; separated from one another by walls, 

 which arc mostly indicated by low, ratlier thick rough muial denticles, that to a calice 

 are more numerous than the septa. In some instances the outer ends of septa of 

 adjacent calices connect across the wall and obscure it. 



The septa are thick, with decidedly thick outer ends, leaving very narrow, slit- 

 like interseptal loculi. Between a palus and the wall there is usually a single septal 

 tralx'cula. rarely there may be two. On the septal margin, between a palus and the 

 wall, there are usually two granules or dentations, tlie inner corresponds to the septal 

 trabecula. while the outer seems to be only a radial process from the mural trabecula. 

 ^^'llen two s(>ptal trabcculic are present, the one next the palus ends in a smaller 

 granule than the outer one. The graiudes are f requentl}- compressed transversely to 

 the septal plane. The single, or the outer, septal granule is .somewhat detached from 

 tlie wall, with the connecting portion of the septal margin excavated. A ring of 

 synapticula usually coincides with the out(>r edge of the septal trabecuhe, joining 

 them togctluM' and reaching the level of the bases of the septal granules. These 

 synapticula often fuse with the wall. The thickened outer ends of the septa, their 

 synapticular coiuiections, and the wall trabecuhe produce a veiy compact mui'al 

 apparatus. 



The pali are thick, pointed and tall, reaching almost to the level of the upper 

 edge of the wall. The formula is usually complete, with those before the lateral 

 pairs .somewhat the larger; sometimes thej- are suppressed on the laterals of the 

 triplet, and either the ventral or the dorsal directive may occasionally be without 

 one. The palar .synapticular ring is complete, with a floor extending across it. 



The columella is a compressed, moderately prominent tubei-cle rising from the 

 the floor across the palar ring of synapticula. 



The skeletal surfaces are covered with closely set, very rough, coarse granulations. 



Localities. — 



French Frigate Shoal, Depth, 17-17^ fathoms (type); Albatross, 1902, Station 

 3970. Four broken branches. 



Vicinity of Modu Manu, or Bird Island, Depth, 20 to 21 fathoms; Albatross, 

 1902; Stiition 41ti8. One branch. 



T;/jM'.-Cat. No. 21272, U.S.N. M. 



Remarks. — The specimen from Modu Manu is a branch 6 cm. long, from which 

 a small lateral is given off 2.25 cm. from the lowei- end; upper end compressed and 

 obtusely roundiKl, greater diameter, 1.6 cm., lesser, 0.85 cm. The skeletal parts are 

 not (juite so thick as in the type of the forma. 



This forma is very close to forma chmgnta, differing from eJongnia l)y its shal- 

 lower calices and decidedly thicker septa. The upper edge of the wall in elongata is 

 more elevated, more definite and continuous. 



Forma hreviramosa has calices averaging smaller, and shorter, nodose branches. 



