94 



Fig. 3). I Rachis findes ingen Muskler; Sarcosomaet er 

 her forsynet med større og mindre Kalkspicler. 



Kjønsorganerne udvikles i den hypogastriske Hulhed 

 hos de fuldt udviklede Polyper, og Æggene udfylde ikke 

 alene denne, men ogsaa de epigastriske Rum, ja indtil 

 Tentakel-Hulhederne. Den rudimentære Finne er forsynet 

 med talrige capillære Ernæringskanaler, der anastomosere 

 med hverandre (Tab. 10, Fig. 10 f). 



Saavel Længdekanalerne som Ernæring skan al erne ere 

 beklædte med Epithel, som opfylder ganske de fineste 

 capillære Saftkanaler (Tab. 10, Fig. 13). 



Axen har en temmelig stor Centralkjerne, der har en 

 kornet Structur. Dens fibrøse Grundsubstants er straalet, 

 Radierne ere bredest i Peripherien, ende spids mod Cen- 

 tret og danne derved Prismer, der ere ganske forkalkede, 

 ligesom hos Halisceptrum (Tab. 10, Fig. 9, 12). 



Omkring Axen findes en elastisk, hyalin Membran 

 (Cuticula) (Tab. 10, Fig. 10 a, c), der slutter sig saa tæt til 

 Skedens indre Væg, at den hyppig følger med denne ved 

 Forsøg paa at separere den fra Axen. 



I denne Membran sees en utallig Mængde runde Fel- 

 ter, som ligge temmelig regelmæssigt nær hinanden og dan- 

 nes af en Fortykkelse af selve Membranen. Disse Felter 

 ere optagne af yderst fine Kalknaale (Tab. 10, Fig. 12 c). 

 Imellem disse Felter løbe en stor Mængde aabne capil- 

 lære Saftkanaler (Tab. 10, Fig 12 p), der blive lukkede 

 ved at den indre Flade af Membranen slutter sig til 

 Axen. Disse Kanaler indeholde et finkornet Fluidum. 

 Skeden bestaar af to Membraner, hvorimellem en sar- 

 comatøs Substants, der er særdeles rig paa Ernærings- 

 kanaler, 



BÜBEN1A ABYSS1COLA, Nob. 



(Tab. 10 og 12, Fig. 1—3). 

 ARTSCHARACTER. 

 Polypstokken indtil 314 Mm. lang, slank, cylindrisk og 

 noget stiv. Rachis omtrent %% Gang saa lang som Stil- 

 ken. Polyperne staa vidt fra hverandre, 3, sjelden 4, paa 

 hver Finne, og ere forsynede med en Række Spicier paa 

 hver Side af Kroppen. Kalkpladen indtager hele Finnens 

 Bredde, dannes af korte og lange Spicier, hvoraf de 

 længste, 9 i Tallet, have 3 Mm.'s Længde. Stokkens Farve 

 gulrød. Polyp ernes brunrød. 



Polypstokken cylindrisk, slank, noget stiv, og paa dens 

 øverste tvers afskaarne Ende er Axen nøgen i en Stræk- 

 ning fra 5—20 Mm. paa de voxne Exemplarer, hvorimod 

 den paa yngre Individer er bedækket af Sarcosomaet. 

 Den sterile Stilk er tenformig og ender almindelig i en 

 stump Spids, paa hvis Ende der findes en liden Grube, 

 som ender blindt i et Par Mm.'s Høide. Aabningen for 

 denne Grube udvider og sammentrækker sig. Denne 



nicating with the ventral and dorsal canal (Tab. 12, fig % 

 1; fig. 3). In the rachis, there are no muscles; the 

 sarcosoma contains larger and smaller calcareous spicula 



The sexual organs are developed in the hypogastric 

 cavity in the fully developed polyps; and the ova fill 

 not only this cavity, but also the epigastric space, nay 

 even the tentacular cavities. The rudimentary fin has 

 numerous capillary alimentary canals anastomosing with 

 each other (Tab. 10, fig. 10 f). 



As well the longitudinal canals as the alimentary 

 canals, are covered with epithelium which entirely fills up 

 the finest capillary sap-canals (Tab. 10, fig. 13). 



The axis has a rather large central- nucleus of a 

 horny structure. Its fibrous fundamental substance is 

 radiated; the radii are broadest at the periphery, ter- 

 minating in points at the centre, and forming thereby 

 prisms which are quite calcined, as in the Halisceptrum 

 (Tab. 10, fig. 9, 12). 



Around the axis there is an elastic hyaline membrane 

 (cuticula). (Tab. 10, ß.g. 10 a, c) flitting so closely to the 

 inner wall of the sheath that it frequently comes away 

 with it when an attempt is made to separate it from 

 the axis. 



In this membrane there appear innumerable round 

 spots lying rather regularly near to each other, and formed 

 by a thickening of the membrane itself. These spots are 

 occupied by extremely fine calcareous needles (Tab. 10, 

 fig. 12 c). Between these spots there run a great many 

 open capillary sap-canals (Tab. 10, fig. 12 p) which are 

 closed by the interior surface of the membrane coming 

 in contact with the axis. These canals contain a finely 

 granulated fluid. The sheath consists of two membranes, 

 between which is a sarcomatous substance abundantly 

 supplied with alimentary canals. 



BÜBEN1A ABYSSICOLA, Nob. 



(Tab. 10 and 12, fig. 1—3). 

 SPECIES CHARACTER. 

 The polypary up to 314 Mm. long, slender, cylindrical 

 and somewhat stiff. The rachis about 2V 2 times as long 

 as the stalk. The polyps are situated far apart from 

 each other, 3, rarely 4, on one fin, and have a row of 

 spicula on each side of the body. The calcareous plate 

 occupies the whole width of the fin, and is formed of 

 short and long spicula of which the longest, 9 in number, 

 have a length of 3 Mm. The color of the polypary is 

 yellowish red. The color of the polyps is brown-red. 



The polypary is cylindrical, slender and somewhat 

 stiff; and at its upper truncated end, the axis is bare to 

 the extent of 5—20 Mm. in full grown specimens; while 

 in younger individuals it is covered by the sarcosoma. 

 The sterile stalk is fusiform, and terminates usually in a 

 blunt point, at the end of which there is a little pit about 

 2 Mm. deep. The aperture of this pit expands and con- 

 tracts itself. This sterile part is strongly contractile, and 



