BrLLETIX 5i), UNITED STATES NATIONAL MUSEUM. 7l 



PARACYATHUS MOLOKENSIS, new species. 

 I'latc VI, tign. 3, 3a, 3/.. 



Corallum attached by a wide hase, diaiuctci- not increasing with height, trans- 

 verse outline siihcireiiiai-. (ireater diameter of calice. (J. .5 mm.; lesser, (i mm. The 

 specimen is attaciied to an iri-egular surface, giving a height on one side of .")min.; 

 on the other, 12 mm. The specimen has the appearance of having been broken and 

 of sul)se(|U(Mitly having I'epaired itsidf. 



WnW latlier thin, naked. Cost;v distinct from the calice to the base, alternating 

 in width and prominence near the calice, the larger rather prominent, about halfway 

 down tiie smaller disappear and the larger continue sulie(iual to tiie )>ase. In profile 

 all are rounded and are densely granidated l)oth along the summits and on the sides. 

 Intercostal furrows narrow. 



Septa distant, except in the thecal ring, where the}' stand close together. The 

 arrangement is not very definite; probably the damage that the corallum suii'ered 

 caused the apparent irregularity. There are fifty-two septa, which seems to occur in 

 six systems, foui- coiui)lete cycles, and a ((uarter system in each of two systems has 

 the fifth cj'cle represented. The primaries are slightly tiiicker and longer than the 

 secondaries; the tertiaries are shorter and thinner tiian the latter; the last cycle is 

 rudimentary. There are no definite septal groups, although there may l)e occasional 

 fusion of a tertiary septum to a secondary througli its palus. The primaries and 

 secondaries slightl}' exsert, the others less so, according to the cycle. Margins entire. 

 Faces with very faint ornamentation. 



Pali irregular thin teeth, usually occur on the inner ends of the primaries, 

 secondaries, and tertiaries, but they are not always present, especially on the 

 primaries. 



Calicular fossa rather deep and large compared to the size of the corallum. 

 Greater diameter, 3 mm.; lesser, 2.5 mm.; depth, 2.5 mm. 



Columella rather large, but of very loose texture, composed of anastomosing 

 trabecular that send upwai-d irregularly shapeil projections, which are scarcelv to be 

 distinguished from the pali. 



Locality. — South coast of Molokai Island, Station 3S33; depth, 88-142 fathoms; 

 bottom, sand, pebbles, broken shells, rock; temperature, t>3^ F.; 1 specimen. 



rj(/)e.— Cat. No. 20757, U.S.N.M. 



Rt'iimrli's. — The irregular character and imperfect development of the pali cau.sed 

 me to hesitiite to place this species in the geiuis PunifyatlniK, hut its afhnities are 

 with that genus, unless it should be a Parasmiliit with pseudo-pali. 



Genus DELTOCYATHUS Milne Edwards and Haime 

 DELTOCYATHUS ANDAMANICUS Alcock. 

 Plate VI, figs. 4, 4(1. 

 1898. DeUocynihua aixhimantai!! .Vi.cock, Investigator Deep Sea Madrepor., p. 16, pi. i, tigs. 5, !>a. 

 Original dexcinption. — Alcock describes this species as follows: 



C'oralhiin iliscoid, free, with a siiiall cetitral sear. Costie, in their ilistal half, covered witli .spini- 

 form granules. Those of the tirst three cyeles are indistinet near tlie scar, hut Itecome sliarplv salient 



