78 



Sertularella polyzonias, Lin. 



Trophosome. Hydrocaulus enkel, med uregelniæssig 

 Forgrening. Hydrotheker bregerforraige, glatte, med 4 

 Tæiider om Aabningen. 



Gonosome. Gonangier ovale, rynkede i hele sin 

 Længde, med 4 Tænder om Aabningen. 



Denne Art blev funden i store saramenfiltrede Kolo- 

 nier paa to Stationer, hvoraf den ene or ukjendt. 



rindested. St. 322. 



Sertularella tricuspidata. Alder. 



Trophosome. Hydrocaulus enkel, alternerende Grene. 

 Hydrothek lorformig, udvidet mod distale Ende, med tre 

 Tænder, regelmæssig fordelt om Aabningen. 



Gonosome. Spindelformige Gonangier, sterkt rynket 

 tversover, med en smal rorformig Aabning. 



Fra ikke mindre end 5 forskjellige af Nordli. -Exp.'s 

 Stationer lindes smukke Exemplarer af denne Art. Kolo- 

 nierne har en Hoide af 4 — 12 cm., og de fleste har en 

 meget regelmæssig fjærformet Forgrening. 



rindested. St. 175, 322, 341, 353. .Jan Mayen. 



Dynamena. 



Af Gruppen Dj/naiiieiia forekommer kun to tidligere 



kjendte Arter, nemlig D. fallax og taniarisca, men begge 



disse paa flere Steder. Desuden tindes ogsaa en ny Art, 

 D. unilaieralis. 



Dynamena fallax, Johnst. 



Trophosome. Hydrocaulus enkel, med alterneret 

 stillede Grene. Hydrotheker rørformige, med en glatrandet, 

 oval Aabning, hvis Plan danner en spids Vinkel med 

 Længdeaxen. Længdcn af Hydrothekernes divergerende 

 Del er omtrent lig deres Bredde. 



Gonosome. Gonangier store, med 4 Kibber udvendig 

 (mindre udviklet hos Han end hos Hun), der forlænges 

 udenfor Gonangiets distale Ende til 4 ligestore Blade, der 

 danner et Slags Kammer udenfor dette. 



Blandt de hjembragte Kolonier af denne Art, er 

 enkelte meget store, 15 — 20 cm. høie, og smukt forgrenede. 



Findested. St. 303?, 315, 322. 



Dynamena uniiateralis, n. sp. 



(Tab. VII, Fig. :<). 



Trophosome. Hydrocaulus enkel, Grene uregelmæs- 

 sig alternerende, Hydrotheker rørformige, noget smalere 

 ved Mundingen end ved Basis, med cirkelformig, glatrandet 

 Aabning, hvis Plan staai' lodret paa Grenenes Længdeaxe. 



Sertularella polyzonias. Lin. 



Trophosome. Hydrocaulus sira})le, with irregular 

 branching. Hydrothecæ cup-shaped, smootli, with 4 teeth 

 about the opening. 



Gonosome. Gonangia oval, wrinkled throughout their 

 length, with 4 teeth about the opening. 



This species was found in large, tangled colonies at 

 two stations, one of which is unknown. 



Locality. Station 322. 



Sertularella tricuspidata. Alder. 



Trophosome. Hydrocaulus simple, alternating bran- 

 ches. Hydrotlieca' tubular, expanded at the distal end, 

 with three teeth at regnlar intervals round the opening. 



Gonosome. Spindle-shaped gonangia, very much 

 wrinkled across, with a narrow, tubular opening. 



Tliere are tine spccimens of this species from no less 

 than 5 different stations of the N. Atlan. Exp. The colo- 

 nies have a height of from 4 — 12 cm., and most of them 

 have a very regular pinnate extension. 



Locality. Stations 175, 322, 341 and 353; ,Tan 

 Mayen. 



Dynamena. 



()nly two prcviously known species of the gioup Dy- 



ucuiiena occur, namely D. JaUax and D. tamarisca, but 



both of them in several places. There is also a new spe- 

 cies, D. uniiateralis. 



Dynamena fallax, .loluist. 



Trophosome. Hydrocaulus simple, with alternating 

 brauches. Hydrothecæ tubular, with a smooth-edged oval 

 opening. whose plane makes an acute angle with the long 

 axis. The length of the divergent ])ortion of the hydro- 

 theca is about equal to its breadth. 



Gonosome. Gonangia large, with 4 external ribs 

 (less developed in the male than in the female), which are 

 produced Ijeyond the distal end of the gonangiuni, in the 

 shape of 4 equal leaves, forming a kind of comb. 



Among the colonies of this species brought home, a 

 few are very large — from 15 to 20 cm. in height — 

 and beautifuUy branching. 



Locality. Stations 303(?), 315 and 322. 



Dynamena uniiateralis, u. sp. 



(Pl. VII, fig. 5). 



Trophosome. Hydrocaulus simple, branches alter- 

 nating irregularly. Hydrothecæ tubular, somewhat nar- 

 rower at the mouth than at the base, with circular smooth- 

 edged opening, whose plane is at right angles to the long 

 axis of the branch. 



