

17 



Geodia parva, n. sp. 



En Men, ca. 4 mm lang, haarcl Svamp med lidt knudet 

 og ujevn Overflade. Skorpen dannes af Geodiakugler af 

 det sædvanlige Udseencle; noget Osculum kan ei opdages; 

 Svampens Centralmasse dannes af en traadet Sarkode, der 

 næsten har Udseende af fibrillært Bindevæv, og i denne 

 findes et ringe Antal trac Naale nden nogen bestemt An- 

 ordning, af hvilke enkelte rager incl i den af Kiselkugler 

 dannede Skorpe, og clesnclen spredte Kiselkugler og gl st 

 Naale (Tab. V, Fig. 1). 



Findested. 



Station ukjendt. 



Pachymatisma iohnstonia, Bowerbank. 



Der er fundet foruden nogle smaa Exemplarer, der i 

 det Ydre har megen Lighed med de af Vosmaer x som 

 Isops sphdroides og Isops pallida beskrevne Svampe, ogsaa 

 meget store Exemplarer, 5 — 6 cm i Gjennemsnit. Ingen af 

 dem viser imidlertid det for Isops karakteristiske Forhold 

 af Oscula og Porer. Der findes talrige Oscula paa hele 

 Overfladen, hvert Osculum omgivet af en liden Vold (Tab. 

 IV, Fig. 15, a). Den ydre Skorpe er dannet af et jevn- 

 tykt Lag af Kiselkugler (Fig. 15, 6) op i hvilket der rager 

 Naale af forskjellig Form, dels Mta (cp — 90°), enkeltvis 

 Mtabif (Fig. 15, c), dels ac 2 f (Fig. 15,0). Mellem Kisel- 

 kuglerne findes i Overfladen smaa gist (Fig. 15, e)\ saa- 

 danne findes ogsaa inde i Svampen ved Siden af større st 

 (Fig. 15, f) og Kiselkugler i forskjellige Udviklingsstadier 

 (Fig. 15, g), paa hvilke man tildels tydeligt kan se disses 

 Opbygning af prismatiske Naale, der med Spiclserne støde 

 sammen i Centrum og vende de brede Ender ud mod 

 Periferien (Fig. 15, h). Disse ydre Ender er ikke hos 

 alle Kiselkuglerne afstumpede; paa en Del ser de afstum- 

 pede ud, naar man ser dem en face, men vecl at betragte 

 Randen ser man, at de ere tilspidsede (Fig. 15, i). For- 

 uden de længere ac 2 f Naale findes inde i Svampen korte 

 trac og tr°tr Naale (Fig. 15, k). 



Findested. 



Station ukjendt og 359. 



1 Vosmaer : Report on -the Sponges dredged up in the Arctic 

 Sea by the „Willem Barents" in the years 1878 and 1879. Nieder- 

 landisches Archiv fur Zoologie. Supplementband I. 1881 — 82. 

 Den norske Nordhavsexpedition. G. A. Hanssen: Spongiadæ. 



Geodia parva, n. sp. 



A small, hard sponge about 4 mm in length, with a 

 somewhat knotted and uneven surface. The crust is 

 formed of Geodia spheres, of the usual appearance. No 

 osculum can be seen. The central substance, or mass of 

 the sponge, is formed of a filamentous sarcode, that has 

 almost the appearance of fibrillous connective-tissue ; a small 

 number of trac spicules are found in it, but without any 

 definite arrangement, and a few of these spicules project into 

 the crust formed by the siliceous spheres ; and further, also, of 

 scattered siliceous spheres, and gl st spicules (PL V, fig. 1). 



Habitat. 



No record. 



Pachymatisma Johnstonia, Bowerbank. 



Besides a few small specimens of sponges, which in 

 external appearance have much similarity to those described 

 by Vosmaer ] , as Isops spheroides and Isops pallida, some 

 very large specimens were, also, found, measuring 5 — 6 cm in 

 diameter. None of them, however, exhibit the peculiar 

 condition of oscula, and pores, characteristic of Isops. 

 Numerous oscula are found on the entire surface, each 

 osculum being surrounded by an elevated margin (PL IV, 

 fig. 15, a). The external crust is formed, of a uniformly 

 thick layer of siliceous spheres (fig. 15, b), in which spic- 

 ules of various forms project ; partly Mta (cp — 90°), occasion- 

 ally Mtabif (fig. 15, c) and partly ac 2 f (fig. 15, d). Between 

 the siliceous spheres in the surface there are found, small 

 gl st spicules (fig. 15, e). These are also found, inside the 

 sponge, along with larger st spicules (fig. 15,/), and siliceous 

 spheres in various stages of development (fig. 15, g) upon 

 which, sometimes, may be, distinctly, seen, their structure of 

 prismatic spicules, meeting together in the centre with their 

 apices, and turning their broad extremities towards the 

 periphery (fig. 15, h). These outer extremities are not 

 blunted in all the siliceous spheres. In a number of them 

 they appear blunted, if viewed en face, but on investigation, 

 of the margin, they are seen to be, in reality, acuate (fig. 15, i). 

 Besides the long ac 2 f spicules, short trac and tr® tr spic- 

 ules are also found (fig. 15, k), inside the sponge. 



Station No. 359, 

 which has been lost. 



Habitat. 



and other stations, the record of 



1 Vosmaer. Report on the Sponges dredged up in the Arctic 

 Sea, by the „Willem Barents", in the years 1878 and 1879. Meder- 

 låndisches Archiv fur Zoologie. Supplementband I. 1881 — 82. 



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