BULLETIN 59, UNITED STATES NATIONAL MUSEUM. 

 MEASUREMENTS. 



69 



Costie correspondiiii,'- to all .septa, continuing to the edge of the basal .scar; they 

 aro low. widi'. e(|ual. rounded or Hattish, den.sely granulated. Intercostal spaces 

 narrow and shallow. 



Septa in four complete cycles, in .some half systems there may l)e a few mem- 

 bers of the fifth. The members of the first and second cycles are of nearlv the same 

 size, secondaries very slightly shorter; they are moderately thick, their upper 

 margins rather prominent, projecting 1.5 mm. above the upper edge of the wall. 

 The tertiaries and (luaternaries are <N|ual in jiromiiience, length, etc., and are onlj' 

 slightly exsert. Septal faces delicately fluted and granulat^(l. Pali in three definite 

 ci'owns, l)efore the septa of the first, .second, and third cycles, narrowest before the 

 first and widest before the third. Where septa of the fifth cycle are present pali 

 may stand before septa of the fourth. Apparently some of the pali may lia\e inner 

 lobes. 



Columella not very large, composed of a number of papilla', upper surface ellip- 

 tical and depres.sed below the pali. 



Calicular fossa rather narrow, only moderately deep. 



Loc.aUt)j. — Hawaiian Islands. If« the station luunber was with these specimens 

 when they were sent to me, it was lost. 



Cotypes. — Three .specimens, Cat. No. 2075J:, U.S.N.M. 



PARACYATHUS TENUICALYX, new species. 

 Plate VI. tigs. 1, \„, \h. 



Corallum attached hy an expanded liase. aliuve which rises a stout peduncle 5 

 nun. in diameter and T nun. tall, in its upper portion gradually increasing in diameter. 

 'i'he caHce is almost circular, having a greater diameter of S..5 mm. and a le.s.ser of 8 

 mm. Height of corallum 18 mm. 



The outer surface of tiie peduncle is without cost*, but possesses luunerous 

 transverse undulations. Above these are distinct equal costa> corresponding to all 

 septa. The co.stal edges are subacute and very regularly beaded; intercostal furrows 

 narrow. 



Septa in four complete cycles. The members of the first and second cycles are 

 of the same size, with somewhat exsert margins; those of the fourth cycle are 

 usually slightly longer than those of the third, but their up])er mai'gius are eipial in 

 prominence. All of the septa are thicker in the thecal ring, where they are crowded, 

 but become thinner toward the center. The inner ends of both the first and .second 



