100 





Traade og paa deres aborale Flade er en Kække Spicier. 

 Ogsaa i Stokkens Sarcosoma findes en Mængde Spicier. 



Axen, der skinner tydeligt gjennem Sarcosomaet, er 

 1 Mm. tyk og gaar lige ned i Bunden af den køllefor- 

 mige Stilk, hvor den ender tilspidset og yderst svagt 

 bøiet. 



Langs Axen ere fire Længdekanaler, der gaa lige 

 ned til den nederste Ende. Farven saavel paa Stokken 

 som Polyperne er bleggul. 



Den er funden i 2 Exemplarer af Professor G. O. Sars 

 ved Eisvær i Lofoten paa 80 — 100 Favnes Dyb, sandig 

 Bund. 



Lygomorpha Sarsii characteriseres saaledes: 



Hachis cylindrisk, lidt tykkere mod den øverste Del. 

 Hachis lige til Spidsen besat med Polyper, der sidde 

 uregelmæssigt afvexlende paa Kyg og Sider, dels enkelt- 

 vis, dels 2 og 2, og dels i Grupper paa 3 og 4. Cellens 

 halvmaaneformige Indsnit er omtrent dobbelt saa dybt 

 paa den Side, der vender mod Stokken, som paa den 

 anden. Farven paa Stok og Polyper bleggul. 



Udmaalinger af 2 Exemplarer i Mm.: 



A. B. 



Stokkens hele Længde . . . 120 105 

 Rachis do. ... 85 70 



Stilkens do. ... 35 35 



Polypernes Antal 86 62 



Slægten Lygomorpha kommer nærmest Halipteris, 

 Kølliker, men adskiller sig dog væsentlig fra denne der- 

 ved, at Polypstokken er meget kort, kølleformig med faa 

 Polyper. Cellerne tykke, forsynede med to lange, stærke 

 Tænder (Spidser) og en halvmaaneformig Aabning med 

 Indsnittet dybest mod Stokken. Zooider sparsomme og 

 paa Dorsalfladen. Ventralfladen rund, bred og nøgen. 



FORKLARING OVER FIGURERNE. 



Tak 9, Fig. 7. Et Exemplar i naturlig Størrelse, seet fra Ryggen. 



Fig. 8. Det samme, fra Ventralsiden. 



Fig. 9. En Celle, forstørret, med sin halvmaaneformige Aabning. 



a Tænderne; b indre, dybere Indsnit; c ydre Væg; 



d Spicier. 

 Fig. 10. Cellens Spieler, forstørret. 

 Fig. 11. En Tentakel med Spieler, forstørret. 

 Fig. 12. Tentakelspicler, stærkere "forstørret. 



CLABISCUS, Nob. l ) 

 Danielssen har i sin Beretning om en zoologisk Reise, 

 foretagen i Sommeren 1857, opført Virgularia mirabilis, 

 som af ham funden ved Slotholmen i Lofoten. Ved nu 

 nærmere at undersøge hans Exemplar, der destoværre 

 mangler den egentlige Stilk, viser det sig, at denne Sø- 

 fjær fjerner sig saa langt fra Virg. mirabilis, at den endog 

 maa danne en ny Slægt, der af os er givet ovenanførte 

 Navn. 



to form them (fig. 9 d). Thy polyps are rather large 

 and can be retracted into the cells; their tentacles fur- 

 nished with many filaments, have on their aboral surface 

 a row of spicula. Also in the sarcosoma there are nu- 

 merous spicula. 



The axis which shines plainly through the sarcosoma 

 is 1 Mm. thick, and goes right to the bottom of the clavi- 

 form stalk, where it terminates in a point very slightly 

 curved. 



Along the axis there are four longitudinal canals 

 which go right down to the lower extremity. The color 

 as well of the polypary as of the polyps, is pale yellow. 

 Two specimens have been found by Mr. G. O. Sars 

 at Risvær in Lofoten at the depth of 80 — 100 fathoms 

 on sandy bottom. 



Lygomorpha Sarsii is thus characterised: 

 The rachis cylindrical, a little thicker towards the 

 upper parts. The rachis, up to the very point, covered 

 with polyps irregularly alternating on the back and sides 

 singly or 2 and 2 and partly in groups of 3 or 4. The 

 semilunar incision of the cell is about twice as deep on 

 the side that turns towards the polypary as on the other. 

 The color of the polypary and of the polyps pale yellow. 

 Measurements of two specimens in millimetres. 



A. B. 



Total length 120 105 



Rachis 85 70 



Stalk 35 35 



Number of polyps .... 86 62 



The genus Lygomorpha comes nearest to the Halip- 

 teris, Kölliker, but is yet essentially distinguished from 

 it by the polypary being very short, claviform and with 

 few polyps. The cells are thick, furnished with two strong 

 teeth (points) and a semilunar aperture with the incision 

 deepest towards* the polypary. The zooids rare and on 

 the dorsal surface. The ventral surface round, broad 

 and bare. 



EXPLANATION OF THE FIGURES. 



Tab. 9, fig. 7. A specimen of natural size viewed from the back 

 Fig. 8. The same viewed from the ventral side. 

 Fig. 9. A cell magnified with a semilunar aperture, a the teeth ; 

 b interior deeper incision; c exterior wall; d spicula. 



Fig. 10. Spicula of the cell, magnified. 

 Fig. 11. A tentacle with spicula, magnified. 

 Fig. 12. Single spicula, more magnified. 



] ) KXadidnoS, en liden Gren. 



CLAD ISC US, Nob. 1 ) 

 Danielssen has in his report of a zoological journey 

 made in the summer of 1857 noticed the Virgularia mira- 

 bilis as found by him at Slotholmen in Lofoten. On 

 closer examination of his specimen, in which unfortuna- 

 tely the proper stalk is wanting, this sea-pen appears to 

 differ so much from Virg. mirabilis that it must even 

 form a new genus, which we have named as above. 



*) KXaöitiuoS, a small branch. 



