BULLETIN 59, UNITED STATES NATIONAL MUSEUM. 135 



Family AGARICIlDyE Verrill. 



Genus PAVONA Lamarck. 

 PAVONA VARIANS Verrill. 

 Plate XXXVIII, figs. 1, la. 

 1864. Paronia variaiix Verrill, Bull. Mus. Comp. Zool., I, p. .5.5. 



Original description. — Verriirs orij^nnal deiioriptiou was as follows: 



Corallum iiicrustinpr, varyini; iu form according to the object upon which it grows, at times glom- 

 erate, ma.«sive, anil gibbous, with short, angular, or convoluted crests rising from the surface. These 

 sometimes become more elevated, with an acute e<lge, or, by incrusting the tubes of ,'j!i'i-pul:i, risi- into 

 irregular ramose forms. Septa from 12 to l(i, the primary ones thickened, strongly granulated. Cells 

 rather small, open; columella small, paiiillifonn often wanting. — Sandwich Islands; A. (iarrett. 



Plate XXXVIII, figures 1, in. gives views of a specimen and render unnecessary 

 a more lengthy description of the form of the corallum. Kather often the margin 

 of the corallum may be free and project a centimeter or somewliat more be^'ond the 

 objei't of attachment. The imder surface of the free edge is covered witli sinLiou.s 

 graimlated sti'ia' and is furrowed, the furrows corresponding to the i-ollines of tlie 

 upper surface; there are shreds of epitheca, in fact it is probable that tliere is a 

 fairh' complete epitheca between the colony and tlie object of support. An epithecal 

 edge is visible for considerable distances. 



The usual number of septa to a calice is larger than that given bj- Professor 

 Verrill. about 24. with <> or 8 larger than the others. Synapticula well developed, 

 moderately aliundant, and there are some, though not veiy numerous, dl.ssepiments. 



The columella when present is poorly developed, a .single tubercle, but usually 

 it is absent. 



Zomlitid-s. — Northeast coast of Hawaii Island, Station 4053; depth, 26-29 fath- 

 oms; bottom, fine gray sand; 1 dead specimen. Ueef at Kaunakakai, Molokai 

 Island; 2 specimens. Two other specimens, without locality labels, were probably 

 obtained there. Pukoo, Molokai, 4 specimens; Kahana, Oahu. 1 specimen; Kaneohe, 

 Oahu, 1 specimen; Waikiki, Oahu, 1 specimen; depth, 3 to (3 feet; received from 

 W. T. Brigham. Professor Duerden collected the species at Kaneohe. 



Rehiarkx. — This species closely resembles Pavona repenx Brueggemann, the 

 most noteworthy difference is tiiat the latter possesses a distinct papillary cohunella. 



PAVONA DUERDENI, new species. 

 Plate XXXVIII, ligs. 2, 2a, 3. 



The corallum grows in the form of ])lates a centimeter tliick. or somewhat more, 

 or as an irregularly nodose mass. 



The calices are small, and although distinctly delimited, occur in rather definite 

 rows, which roughly parallel the growing edge. The calices in one row are separated 

 by narrow walls; adjoining rows arc sei)arated by Hat coUines. The distance between 

 calicinal centers in the same row is about 1.5 nun.; between opposite centers across a 

 colline, about 2 nun. 



