30 



Af denne Art foreligger der kun et Exemplar fra 

 Station 101. Exemplaret havde en Skivediameter af 6""", 

 Armenes Længde var 32""" ; Forholdet mellem Skiven og 

 Armene blir saaledes som 1 : 5, Muller & Troschel angiver 

 Forholdet til 1 : 7, ifølge Stewart er det hos Exemplarer 

 med en Skivediameter at' 30""" 1:9. M. Sårs fandt. at 

 det var 1:11 eller 12. Forholdet mellem Skiven og Ar- 

 mene synes saaledes med Alderen at blive større og større. 

 Skivens femkantede Form var hos dette Individ tydeligere 

 udpræget end hos de fulclt udviklede, sum undertiden kan 

 være næsten runde. Ligeledes traadte Ribberne, som havde 

 en Længde af 2.V"". og en Bredde af 0.3— 0.4""". skarpere frem; 

 sandsynligvis skriver dog dette sig blot fra. at Skivens Hud 

 var stærkt kontraheret. Hos et noget større Exemplar 

 fra Bergensfjorden (Skivediameter ti""") var nemlig Ribberne 

 ganske skjulte af den overliggende Hud som hos de fuldt 

 udviklede individer og traadte forst frem, da Exemplaret 

 blev tørret. Skiven er. som af M. Sårs bemærket, under 

 den nøgne Hud bedækket af adspredte, rundagtige, uoget 

 convexe, større og mindre hvide Kalkkorn. som dog forst 

 blir synlige paa tørrede Exemplarer. Disse Kalkkorn 

 synes at optræde i større Mængde hos de ældre, fuldt 

 udviklede Exemplarer end hos de yngre. 



Genitalspalterne Ugger, hvad allerede Mtiller og 



Troschel har paapeget, i en Fordybning i Interbrachial- 

 rummene. Dette gjælder dog blot hos de fuldt udviklede 

 Individer: hos ganske unse Exemplarer, som det her om- 

 talte, mangler derimod Fordybningen ganske. Ogsaa hos 

 ældre kan den undertiden mangle, men det er dog meget 

 sjeldent. Hos ældre veludviklede Individer er Fordyb- 

 ningen stundom afgrændset fra [nterbrachialrummet ved en 

 Vold. som synes at være dannet ved en større og tættere 

 Ansamling af de ovenfornævnte Kalkkorn.' Mavesækkens 

 og Genitalspalternes Bygning viser paa det tydeligste, at 

 Slægten Asteronyx er en ægte Euryal. Maven løber nemlig 

 hos denne Art ligesom hos Gorgonoceplidlus eucnemis ud i 

 Blindsække, dog synes ikke disse at være saa dybe, heller 

 ikke er de saa vel befæstede. Grenitalspalterne munder 

 ligeledes direkte ud i Kropshulen, cfr. Lyman *) og Levin- 

 sen -). Mavesækkens 5 brachiale Blindsække er fastvoksede 

 til de Sække. der omgiver Generationsprodukterne. Des- 

 værre var det mig ikke muligt at faa udredet disses |Byg. 

 ning paa Grrund af det ringe Materiale, som stod til min 

 Disposition; det er dog sandsynligt at ogsaa hos Asteronyx 

 lovéni omgiver disse Sække, Peritonealsækkene, andre Sække. 

 hvori Æggene ligger. 



Skiven var hos det her omtalte Exemplar brunviolet, 

 da det var ilive, Armene kjødfarvede; i Alkohol er Skiven 

 mørkebrun med gulbrune Ribber og Arme. 



') The stomach and genital organs of Astrophytidæ. Bull. Mus. 



Comp. Zool., vol. VIII. No. (i. 

 8 ) Kara-Havets Echinodermata. Dijmphna Togtets zool.-botan. 



Udbytte, pag. -10' i. 



Of tliis species there is only one specimen from 

 station 101. The specimen bad a disc-diameter of 6"""; 

 the length of the arms was 32"'"' ; the proportion between 

 the disc and the arms is thus, as 1 is to 0. Muller and 

 Troschel state the proportion as 1 is to 7. According to 

 Stewart it is. in specimens having a disc-diameter of 30""" 

 as 1 to 9. M. Sårs found it to be as 1 to 1 1 or 12. 

 The proportion between the disc and the arms appears 

 therefore to 1te greater and greater, according to age. 

 The pentagonal form of the disc was in this individual 

 more distinctly marked than in the fully developed animal, 

 which may occasionally he almost round. The ribs, like- 

 wise. which were 2.:.""" in length with a breadth of 0.3—0.4""", 

 appeared more prominently; probably tliat is only due, how- 

 ever, to the fact that the integument of the disc was 

 greatly contraeted. In a somewhat larger specimen from 

 the lleigen fiord (diameter of disc 8"""); the ribs were, 

 namely, quite concealed, hy the super-incumbent integument. 

 as in the fully developed individuals, and Hist appeared 

 after the specimen had been dried. The disc is. as re- 

 marked by M. Sårs. covered below the bare integument 

 by scattered roundish, somewhat convex, larger and smaller 

 white calcareous grains, which are. however, first visible 

 in dried specimens. Those calcareous grains seem to ap- 

 pear in greatest abundance in the older, fully developed 

 specimens rather than in the younger ones. 



The genital fissures tie, as has already been pointed 

 out by Miiller and Troschel. in a cavity in the interbrachial 

 spaces. That is the case. however, only in the fully deve- 

 loped individuals: in quite young specimens. as the one 

 spoken of heiv. the cavity is. on the contrary, quite absent. 

 It may also be absent in older specimens occasionally. hut 

 that is. however. very rare. In older, well-developed indi- 

 viduals the cavity is som. times separated from the inter- 

 brachial space hy a wall. which seems to be formed by a 

 larger and denser collection of the above named calcareous 

 grains. The structure of the stomacb-sac and the genital 

 fissures, shows most distinctly that Asteronyx is a real 

 euryalean. The stomach passes, namely. in this species. 

 as in Gorgonoc&phalus eucnemis, into cæca, hut those 

 do not appear to be so deep. neither are they so well 

 secured. The genital fissures likewise debouch direct into 

 the bodv-cavity. imp. Lyman 1 ) and Levinsen 2 !. The 5 hrachial 

 cæca of the stomac-sac are concreted to the sacs which 

 enclose there productive products. Unfortunately it was not 

 possible for me to elucidate the structure of these, owing to 

 the small quantity of material at my disposal; it is, how- 

 ever. probable that also in Asteronyx lovéni those sacs, the 

 peritoneal sacs, enclose other sacs in which the ova lic. 



The disc was. in the specimen spoken of here, brown- 

 violet, when it was alive. the arms flesh-colour. In alcohol 

 the disc is dark-brown with yellowish brown arms and ribs. 



') The stomach and genital organs of Astrophytidæ. Bull. BIus. 



Comp. Zool., vol. VIII. No. li. 

 -) Kara-H avets Echinodermata. Dijmphna Togtets zool.-botan. 



Udbytte. pag. 407. 



