15 



Pindested. 



Station 58, og en anden, hvis Navn er gaaet tabt. 



Desmacidon arcticum, n. sp. 



Et aflangt Hoved paa en temmelig tyk Stilk, Farven 

 hvid (Tab. VI, Fig. 16). Stilken bestaar af lange trac og 

 tr 2 Naale, eler straaler ud i Hovedet i alle Retninger; i 

 Hovedet en kornet, ufarvet Sarkode, i hvilken findes .ane 2 3 

 og ane 2 6, samt i ringe Antal ^ og co (Buer og S-formige 

 Naale) (Tab. III, Fig. 2). 



Pindested. 



Station 137. 



Esperia. 



Til denne Slægt tror jeg at maatte henregne de føl- 

 gende Dyr, der alle har trac og rut-rut Naale, og jeg er 

 med Hensyn til dem i den samme Forlegenhed som med 

 de foregaaende, om jeg skal henføre dem til samme Art 

 eller gjøre flere Arter af dem, 



Paa Tab. VII, Fig. 1, 2, 3, 4, 5, 14 og 15 findes 

 disse Formers ydre Udseende fremstillet og paa Tab. III, 

 Fig. 6 og Tab. IV, Fig. 2 endnu to andre. Som det vil 

 sees, er de betydeligt afvigende i sin ydre Form, men ved 

 Undersøgelse af eieres Bygning viser denne sig at være 

 paafaldencle ensformig hos dem alle, som det vil sees af 

 Tab. III, Fig. 3, 4, 5, 6, 7 og Tab. IV, Fig. 1 og 2, 

 idet der hos dem alle findes Straaler af Spikier, der rage 

 ud fra en fælles Stamme, dels i Form af fine Naale, dels 

 i Form af Blade ; alle disse Naale er trac og i det tynde 

 Lag af Sarkode, der ligger udenpaa disse Naalebundter og 

 tildels inde mellem Naalene i Stammen findes rut-rut af 

 noget forskjellig Størrelse hos de forskjellige Dyr, men hos 

 alle af samme Form. Hos en enkelt er der ogsaa fundet 

 S-formige Naale (Tab. IV, Fig. 2). 



Efter dette forekommer elet mig at være rettest at 

 henføre dem alle til en Art, som jeg vil kalde 



Esperia bihamatifera (Carter), Vosmaer 1 . 

 S-formige Naale findes, som ovenfor bemærket, kun 



1 Vosmaer: The family of the Desmacidinæ. Notes from 

 the Leyden Museum. Vol. II, 1879. 



Station No. 

 yhich is lost. 



nH. 



Habitat. 



and another 



station the record of 



Desmacidon arcticum, n. sp. 



An oblong head, on a rather thick stem, and white 

 in colour (PI. VI, fig. 16). The stem consists of long 

 trac and tr 2 spicules, which radiate, outwards, in all direc- 

 tions, in the head. In the head, there is a granular, colour- 

 less sarcode, in which anc 2 3, and anc 2 6, spicules appear 

 and, also, a few ^ and go spicules (Bows and S-formed 

 spicules) (PL III, fig. 2). 



Habitat. 



Station No. 137. 



Esperia. 



To this genus, I have found myself obliged to assign 

 'the following animals, all of which have trac and rut-rut 

 spicules, and I am in the same difficulty in regard to them, as 

 with the preceding ones viz. whether to assign them to the 

 same species, or form several species for them. 



Upon PI. VII, figs. 1, 2, 3, 4, 5, 14 and 15 the 

 external habit of these forms is illustrated; and on 

 PL III, fig. 6 and PL IV, fig. 2, still, other two forms are 

 shown. As will be apparent, they are considerably diver- 

 gent in their external habit, but on investigation of their 

 structure, that is seen to be, remarkably, uniform in them 

 all, as may be seen on referring to PL III, figs. 3, 4, 5,. 

 6, 7 and PL IV, figs. 1, 2; in so far, that in all of them, 

 rays of spicules are found, which shoot outwards from a 

 common root, partly, in the form of slender spicules, and 

 partly, in the form of leaves. All of these spicules are 

 trac in form, and in the thin layer of sarcode which is 

 found outside of these spicular fasciculi, and partly, also, 

 between the spicules of the root, there are found rut-rut 

 spicules, of somewhat different size in the different animals, but 

 still having the same form in all of them. In a solitary one, 

 there are, also, found S-formed spicules (PL IV, fig. 2). 



It appears to me, from this, that it is best to assign 

 the whole of them to one species, and this I will desig- 

 nate 



Esperia bihamatifera (Carter), Vosmaer 1 . 

 As remarked above, S-formed spicules are foundonly 



1 Vosmaer. The family of the Desmacidinæ. Notes from 

 the Leyden Museum. Vol. II, 1879. 



