144 UKCKNT MADREI'OKARIA OF TIIK HAWAIIAN ISLANDS AND LAYSAN. 



Calicos voi-y shallow; in fact, they are supcM-ticial. They possess no distinct 

 boundaries, l)ut are connected by confluent septo-cost;e. Distance between centers 

 2 to 2.5 mm. There are from 20 to 24 septa to eacih calice; 7 or 8 of these extend to 

 the caliculur fossa and b(>ar small paliform lobes. The columella is a styliform 

 tub(>rcle, occasionally inorc^ than one tubercle. There is a circular space surrounding 

 the tui)ercle and separating it from the inner ends of the septa. The septa are 

 solid, thick; decidedly thickei' than the width of the interseptal loculi. Septal 

 margins coarsely and roughly denticulate, the denticulations of the different septa 

 eiiual in iieight. Septal faces finely granulate. Both synapticula and thin dissepi- 

 ments present. 



Localiti/. —KiihiUKi, Oahu; depth, 3 to 6 feet; 1 .specimen, received from Prof, 

 A\'. T. Hrigham. 



Ti/pe. -Cat. No. 21629, U.S.N. M. 



Remarls. — S. hrtghaml difi'ers from ^9. stellata Verrill by having its calicos 

 superficial instead (d' slightly excavated, by its coarser and more irregular septal 

 dentations, and by having in most calicos a single columella tubercle instead of 

 several papilla'. 



A young, solitary individual of this species was attached to. the lower portion of 

 the colon3\ The calice of this is represented by Plate XLIII, figure 5. It exhibits no 

 chai'acters worthy of special notice except that the wall of the primitive cup is com- 

 posed of epitheca only. There are in the interseptal loculi peripheral synapticula, 

 but th(>, ends of the septa are not fused. 



Genus PSAMMOCORA Dana. 



PSAMMOCORA VERRILLI, new species. 



Plat.- XLIV, lige. 1, la. 



The corailum is incrusting, rather thin, a few millimoters in thickness; the 

 ui)per surface is very irregular. In addition to the ii-regularities caused by conform- 

 ing to the o])ject of attachment, there are numerous monticules, small crests, and 

 variously shaped eminences and projections. 



The calicos possess definite centers, but they usually have indefinite boundaries, 

 and are \ariable in both size and shape. Their arratigomont, also, is indefinite, but 

 there is a frequent tendency for them to occur in series of varial)le length, separated 

 l)y coUiiios of variable height. A large calice measures 2.5 mm. in diameter; a 

 medium sized one, 2 nnn.; in one series, within a distance of 8 mm., 7 centers were 

 counted. The range in diameter therefore, is from 1.3 to 2.5 mm. The distance 

 between calicinal centers on opposite sides of a coUine varies from 2 to 3.5 mm. 

 The length of a colline vari(>s from the diameter of a calice to a centimeter; its 

 height from a mere upward swelling of the surface to 2 mm. There maj' be taller 

 protuberances, one is 6 nnn.; tht>.se boar calices on their surfaces. 



The septa are thick, with nari-ow interspaces, foi-ming between two and three 

 cycles. Usually several extend directly to the columella; the others occur in anasto- 

 mosing groups of from two to five. A definite septal formula could not be deter- 

 mined. The mtirgins of both the sei)ta and the septo-costiB are miiuitoly dentate. 

 One noteworthy peculiarity is the occurrence of a more or less definitely delimited 



