17 



Geotlia parva. a. sp. 



En tiden, oa. I lang, haard Svamp med lidt knudet 

 og ujevn Overflade. Skorpen dannes af Geodiakugler af 

 det sædvanlige Udseende; nogel Osculum kan ei opdages; 

 Svampens Centralmasse dannes af en traadet Sarkode, der 

 næsten har Udseende af fibrillært Bindevæv, og i denne 

 tindes et ringe Antal trac Naale uden uogen bestemt An 

 ordning, af hvilke enkelte rager ind i den af Kiselkugler 

 dannede Skorpe, og desuden spredte Kiselkugler og gist 

 Naale (Tab. V. Fig. I). 



Findested. 



Station ukiend 



Geodia parva. d. sp. 



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

 somewhat knotted and uneven surface. The crust is 

 funned ol' (ItDilia 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 lias 

 almost the appearance of fibrillous eonucotive-t issue ; a small 

 number of trac spicules are found in it. but without anj 

 definite arrangement, anda 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 Y. fig. I). 



Habitat. 



No 



record. 



Pachymatisma Johnstonia. Bowerbank. 



Der er fundet formlen nogle smaa Exemplarer, der i 

 det Ydre har megen Lighed med tie af Vosmaer ' som 

 Isops spharoides og Isojis pallida beskrevne Svampe, ogsaa 

 meget store Exemplarer. 5 — li"" i Grjennemsnit. Ingen af 

 dem viser imidlertid det for Isops karakteristiske Forhold 

 af I )scula og Porer. Der findes talrige Oscula paa hele 

 < >verfladen, hvert Osculum omgivet af en Uden Vold (Tab. 

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

 tykt Lai; af Kiselkugler (Fig. 15, b) op i hvilket der rager 

 Naale af forskjellig Form. dels Mta (qf) = 90°), enkeltvis 

 Mtabij (Fig. 15. r), dels ac 2 f (Fig. 15, d). Melleni Kisel- 

 kuglerne tindes i Overfladen smaa gist (Fig. 15. ei; saa- 

 danne tiiules ogsaa inde i Svampen ved Siden af større st 

 iYvj.. 15,/) og Kiselkugler i forskjellige Utviklingsstadier 

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

 Opbygning af prismatiske Naale. der med Spidserne støde 

 sammen i Centrum og vende de brede Ender uti mod 

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

 alle Kiselkuglerne afstumpede; paa en Del ser de afstum- 

 pede ud. naar man ser dem en face. men ved at betragte 

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

 mlen de hengere «r- f Xaale tindes inde i Svampen korte 

 trac og tr°tr Naale (Fig. 15, Tc). 



Findested. 

 Station ukjendt og 359. 



1 Vosmaer: Reporton the Sponges dredged up in the Arctic 

 Sea by the ..AVilleui Barents" in the years IsTs and 1879. Nieder- 

 låndisches Archiv fur Zoologie. Supplementband I. 1S81 — 82. 

 Den norske Nordhavsexpedition. t;. A. Hanssen: Spongiadæ. 



Pachymatisma Johnstonia, Bowerbank. 



Besitles 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 a " 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 (PI. TV 

 fig. 15, «). The externa] crust is formed, of a uniformly 

 thick layer of siliceous spheres (fig. 15. 6), in which spic- 

 ules of various forms project ; partly Mta (rf = 90"). occasion- 

 ally Mtabif (fig. 15, c) and partly ac'-f (fig. 15, ft"). Between 

 the siliceous spheres in the surface there are found, small 

 gl at 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, /). 

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

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



Station No. 359. 

 which has been lost. 



Habitat. 

 other 



am 



stations, the record of 



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

 Sea, by the „Willem Barents--, in the yr.n* 1878 and 1879. Nieder- 



li'i'i.lisclies Arcliiv fiir Zonlno-je. Supplementband I. 1881 — 82. 



3 



