91 



Deiinu Art, :it' hvilkon vt Par Kolonier (ca, 5 cm. 

 hoie) blev tumlet paa i-a af Xonlli.-Exp."s Stationer. er 

 særdeles fint bygget, og saa liyalin. at det vilde v:ere vau- 

 skeligt at faa Øie jiaa den. jivis den var uden Gonoforer. 

 Koloniens Form ligner 1'. jih/iKifii. kun staar Hydrocla- 

 dierne ikke saa tæt som lios denne, (paa et Par at de Ko- 

 lonier, jeg havde til Undersogelse fandtes Hydrocladier kun 

 i den distale Del\ og don adskilles let fra P. phiinda. 

 saavel ved den finere Bygning, som ogsaa derved, at kun 

 livert andet Internodium hærer Hydrotheker. Gonangiernes 

 Stilling er ogsaa forskjellig hos de to Arter, idet deres 

 Plan hos P. fra/jil/s falder sammen med Hydrocladiernes, 

 medens det hos P. piiuuttn er omtrent lodret paa samme. 



Pindested. St. 267. 



Plumularia variabilis. n. sp. 



I Tab. VII, Kis. ■'■»■ 



Trophosome. Kolonien fjærformig, udgaar fra en 

 forgrenet Hydrorliiza; Hydrocaulus sammensat. tydelig delt 

 i korte Internodier, der hvert bærer, paa alternerende 

 Sider, en Hydrothek, en Gren (Hydrocladium) og to Nema- 

 tophorer. Hydrocladierne er forgrenede, idet en Sidegren 

 udgaar ikke langt fra deres Basis. De er delt i ulige 

 lange Internodie]-, af hvilke — 4 kan tindes mellom hvert 

 hydrothek-bærende Led. Af Nematophorer tindes, for- 

 nden de omtalte paa Stammen, ogsaa tre paa hvert Hydro- 

 thek-luerende Internodium (1 proximalt og 1 Par distalt 

 for hver Hydrothek), og desuden tindes de spredt over 

 Kolonien. 



Gonosome. Ukjendt. 



Denne Art har stor Liglieil med F. grac/Uima, G. 

 0. Sårs, med Hensyn paa den ydi'e Form, paa Hydro- 

 cladiernes Forgrening og paa Nematophorernes Anordning 

 omkring Hydrothekerne; men den skiller sig afgjort fra 

 uævnte Art ved sin forgrenede Hydrorhiza og specielt der- 

 ved, at Hydrocladiernes Internodier varierer i Længde og 

 Anoi-dning, medens deres Bygning hos de øvrige af Slæg- 

 tens Arter synes at være ganske bestemt og karakteristisk 

 for hver enkelt i\.rt. Hoiden af de fundne Kolonier er 

 3 — 4 cm. 



Findested. St. 29U. 



Plumularia rubra, n. sp. 



(Tall. VIL tiy. -Ji. 



Trophosome. Kolonien fjærforiuct ; Hydrocaulus 

 enkel, delt i ligi' lange Internodier, der hvert l}ærer 1 

 Hydrocladium nær sin distale Ende. Hydrocladier ugre- 

 nede, udgaar alternerende, fint bygget med lauge Interno- 

 diei-, der hvert bærer 1 Hydrothek paa sin pro.ximale 

 Halvdel. Hydrothekernes L^engde er \',s— Vs af Interno- 

 diets. Nenuitophoi-er tindes to paa hvert Internodium, en 

 l)roximalt og en distalt for hver Hydrothek, og desuden 

 som Regel en paa hvert af Stammens Internodier, lige ved 



This species, of which two or three colonies where 

 found at uno of the X. Atlan. Ex[). stations. is particu- 

 lariy delicate in strueture, and so liyaline, that it would 

 be difticult to discern, if it were not for the gouophores. 

 In form, the colony resembles P. piiinaia, except that the 

 hydrocladia do not stand so close as in that siiecies (in 

 I one or two of tjie colonies I examined, there were hydro- 

 cladia ouly on tilr distal portion), and it is easily distin- 

 guishable ti'om that sjjecies botli by its more delicate strue- 

 ture, and by thi> faet that every otlier internode Ijears 

 bydrothecic. The position of the gonangia too, is different 

 in tiie two species. their plane in P. Jraq/J/s being ideu- 

 tical with that of the hydrocladia, whilo in 1'. pinuata it 

 is ahnost perpendieular to it. 

 Locality. Station 2G7. 



Plumularia variabilis, n. sp. 

 (Pl. VII. Hg. ;;). 



Trophosome. Colony pinnate, issuing from a bran- 

 ching hydrorhiza; hydrocaulus compound, ilistinctly (Hvided 

 into short internodes, each bearing, on alternate sides, one 

 hydrotheca, one hydrocladium and two nematophores. Tlie 

 hydrocladia are raraified, a lateral branch issuing not far 

 from their base. They are divided into unequal internodes, 

 of which from to 4 may be found between every two 

 hydrotheca-bearing joints. Besides the above-mentioned 

 nematophores on the stem. tliere are also three on eacli 

 hydrotheca-l)earing internode (1 jn^oximal. and one pair 

 distal for every hydrotheca), and moreover scattered over 

 the colony. 



Gonosome. Lnknown. 



This species I)ears a great resemblance to P. r/racll- 

 Ihnii. G. 0. Sårs, as far as the external form, the bran- 

 ching of tl;e hydrocladia, and arrangement of the nemato- 

 phores round the hydrothecæ are concerned, liut it di&ers 

 decidedly from the above-named species in its branching 

 hydrorhiza, and still more in the varying length and arran- 

 gement of the internodes of the hydrocladia, while their 

 strueture in the rest of the species of the genus seems to 

 be quite decided and characteristic of each species. The 

 height of the colonies found is from 3 to 4 cm. 



liocality. Station 290. 



Plumularia rubra, n. sp. 



il'l. VII, tig. -J). 



Trophosome. Colony pinnate; hydrocaulus simple, 

 divided into equal internodes, each bearing 1 hydrochulium 

 near its distal i'nd. Hydrocladia nnramified, branching 

 out alternately, of delicate strueture with long internodes, 

 each bearing 1 hydrotheca on its i)roximal half. The 

 length of the hydrotheca is '■'§ to V.i that of the internode. 

 Tiiere are two nematophores on each internode, one ])roxi- 

 mal and one distal in relation to each hydrotiieca, and 

 also as a rnle, one on each internode ot the stem, close 



