78 KKCKNT MADHKPORAUIA OK THK llAWAIIAN ISLANDS AND LAYSAN. 



/Vicinity of Liivsiin Island, Station Sitr.'i; doptli, 347-:{51 fathoms; bottom, 

 white sand, gravel; ■temp.'iature, 45^ F.; 1 specimen, No. 5 of table, the finest 



obtained. 



Vicinity of Kauai Island, Station 3i);n»; depth, 7-148 fathoms; bottom, coral 

 sand, shells; 2 specimens. Nos. 1 and '1 of tal)le. 



South coast of Oahu Island. Station 3810; depth, 53-211 fathoms; bottom, tine 

 coral sand; tem))erature, -1:7.7 F.; 1 specimen. 



Northwest coast of Oahu Island, Station -1115; depth 195-2-11 fathoms; bottom, 

 coral sand, foraniiuirera; temperature. 55.1=' F.: L specimen, dead. 



The riiiiye in depth of this species appears to be from 127 to 351 fathoms; tem- 

 peratui'e, 45 " to (il F.; bottom, sandy, oravel or vock. 



7}//'c.— Cat. No. 20735, U.S.N.M. 



^<'/«ffr/i-.s.— Four speci(>s of Cyathocerm have previously been described, two by 

 Moseley, C. cornu and C. ruh'sctms, in the Challenger Deep Sea Corals, 1881; one, 

 0. portariceiisix, by myself in my report on the Stony Corals of the Porto Rican 

 Waters, 1901; and one, C. tydnnani, by Alcock in the Sihoga Deep Sea Madre- 

 poraria, 1902. The form above described is most closely related to Moseley's C. 

 rvhescms; in fact, I hesitated to separate it from that species. Moseley says that 

 the surface of ('. rahescetiK is "fflistenino-, but slightly roughened." The surface of 

 the Hawaiian specimens is not glistening, and is granulated all over. The character 

 of the surface may be; variable, but it is constant in the eight specimens examined by 

 me. There may be other differences not brought out ])y Moseley's description. 



Genus CER ATOTROCHUS Milne Edwards and Haime. 



CERATOTROCHUS LAXUS. new species. 



Plate VII, figs. 4, 4a, ib. 



Corallum short-cornute, attached by an expanded base, above which is a short, 

 rather thick peduncle. Above this the corallum gradually increases in diameter with 

 increasing height. Calice suV)circular in outline. Greater diameter of calice 7 mm.; 

 lesser 6.5 mm.: diameter of peduncle 3 mm.; height of peduncle about 2.5 mm.; 

 height of corallum 11.5 mm. 



Wall only moderately thick, naked. Flat, low, densely granulate, equal costse 

 correspond to all septa just txdow the calicular edge, and can be more or less dis- 

 tinctly traced farther down on the corallum by the gramilations. The granulations 

 are rather often arranged transversely to the longitudinal axes of the costa?. 



Septa in three complete cyi'les, and members of the fourth cycle present five half 

 systems, 34 septa in all. The members of the first are the largest, those of the 

 other cycles smaller, according to the cycle, the youngest cycle of any half system 

 almost rudimentary. The first and second cycles have slightly exsert margins, the 

 margins of the third and fourth not jjrominent. Outer ends of the septa somewhat 

 thickened, inner portions thin and delicate. Interseptal loculi very open. Septal 

 faces beset with irregular, low granulations. 



Columella very poorly developed, composcnl of two very thin, more or less con- 

 torted ribbons. 



