68 RECKNT MADREPORARIA OF THK HAWAIIAN ISLANDS AND LAY3AN. 



D. rePonim unci J), rmd Ducha.ssaing and Michelotti. It seem, to me that Dim.'an is 

 correct in his eonelusion: Y>roHih\y 1). refej'inn oi Ducha.ssaing and Muhelotti and 

 D. incertum of the same authors should be placed in the same synonymy. The Des- 

 mophyllnm rUsei of Pourtales" is diflferent from the Demnophylbun rmel of Duchas- 

 saing and Michelotti.'' The specimens Hgured by Pourtales are much more slender 

 than" the type of the species. While in Turin, during the winter of 1897, I found 

 the type of 1). rnsei. It possesses an essential columella, composed of projecting 

 laths," similar in character to that of CanjophylUa. Therefore, D. rusei is not a 

 Besiuophylhiiii, but is probably a Cyathocii'a.s. 



Description.— (Spcdmen from Hawaiian Islands): 



The corallum is broken i)elow, but evidently there was a basal attachment, above 

 which rose a stalk. In its upper portion the corallum rapidly increases in diameter. 

 Transverse outline of calice oval. Diameter of lower broken end of specimen. 7 

 mm.; greater diameter of calice (</) from outer edge to outer edge of wall, neglecting 

 costs, 22.5 iimi.: (/>) between outer edges of costa", 26 mm.; lesser diameter («) from 

 outer edge to outer edge of wall, 17. .5 mm., (b) between outer edges of costw, 21.5 

 mm.: height of specimen, (a) to upper edge of wall, 26 mm., (J) to upper edges of 

 septa, Ml nnn. 



Wall thick and dense. Costa? corresponding to the largest septa, large and 

 prominent, extending rather far down the sides of the corallum, more prominent 

 near the margin of the calice. 



Septa in almost five complete cycles, the primaries and secondaries of similar 

 size, thick, with very exsert margins; the tcrtiaries smaller but with decidedly exsert 

 margins. The septa of the penultimate cycle are wider than those of the last cycle, 

 but their upper margins are not so much elevated. 



The axial fossa is narrow and very deep, as there is no columella. 



LocaUtirn. — Previously reported from the Pliocene of Italy, the Mediterranean, 

 eastern Atlantic, Antilles. Pacific coast of South America, and the Indo-Pacitic 



Alhafnisx, 1902: Kaiwi Channel, between Molokai and Oahu islands. Station 

 3893; depth, 220-316 fathoms: t)ottom, line white sand, rock; temperature 47° F. ; 

 1 specimen. 



Genus PARACYATHUS Milne Edwards and Haime. 



PARACYATHUS GARDINERI. new species. 



Plate IV, tifrs. 4, ■i<i, 4h. 



Corallum h(^avy for its size, shaped like the bowl of an ordinai-y water goblet, the 

 base flatfish or gently roimded, showing in the central portion a ratlier large scar of 

 detachment. Tiie sides of the corallum are almost perpendicular, that is, with 

 increasing height there is very little inirease in the measure of the diameters. 

 Tran^vi ISC outline of the calice broadl}- elliptical. 



oBull. Mus. Com]). Zool., VI, 1880, No. 4, p. 106, pi. i, fig. U. 

 ftMeui. Corall. Antilles, 1861, p. 61 (of reprint), pi. ix, fig. 4. 



