55 



Foran eller over Bingcanalen ligger indenfor Kalkrin- 

 gens forreste Rand Nerveringen (Fig. 14, n). Den er for- 

 holdsvis ikke saa ganske tynd og lidt pentagonal, idet der 

 fra dens Peripheri udgaar 5 Nervestammer, der gjennembore 

 Kalkringens 5 radiale Stykker, og begive sig hver til sin 

 respective Krops-Længdemuskel, hvis Løb de følge. 



Generationsorg anerne (Fig. 1 — 3, e, Fig« 7, e), hvilke 

 neppe strække sig udover den første Sjettedel af Kroppens 

 Længde, ere hos yngre Individer endnu mindre og bestaa- 

 ende af kun nogle faa Rør (hos endnu yngre er der intet 

 Spor af dem at bemærke). De danne 2 symmetriske paa hver 

 sin Side af Tarmcanalen tæt bag Kalkringen paa Dyrets 

 Rygside beliggende Partier (Fig. 7, e), hvis begge Stammer 

 forene sig fortil i det midterste dorsale Intermuscularrum 

 til en eneste temmelig kort og smal Udføringsgang (ibid. k), 

 som ligger tæt til Indsiden af Kroppens Hud i det der- 

 værende dorsale Mesenterium (Fig. 3, m) (hvilket befæster 

 Tarmens første nedstigende Del og tydeligt skinner gjennem 

 Kroppens Hud langs Midtlinien af bemeldte Intermuscu- 

 larrum, betegnende Dyrets Midtlinie, paa begge Sider af 

 hvilken en bilateral Symetri kan bemærkes af mange eller 

 de fleste af Dyrets Organer) og aabner sig udadtil umiddel- 

 bart bag eller under Tentakelkrandsen paa en liden rund 

 Papille (Fig. 1, 3 7, f), som dog ofte er langt fremragende 

 over Hudens Overflade som en cylindrisk 3 Gange længere 

 end tyk Fortsats. Hvert Parti, som i udviklet Tilstand hos 

 middelstore Individer omtrent er 5 Mm. langt, danner (Fig. 

 7, e) et rundagtigt Knippe af talrige (jeg talte 30 — 40), 

 mest dichotomisk forgrenede, korte, temmelig tykke, trinde 

 Rør, hvilke alle ere Grene af en eneste tynd Stamme, som 

 allerede ved Basis deler sig i 2 Hovedgrene. De ere smalere 

 ved deres Udspring og tykkere i deres but tilrundede Ende ; 

 de forreste ere kortere, længere bagtil efterhaanden længere, 

 og af en opak gulhvid Farve, hvorved de skinne klart igj en- 

 nem Kroppens farveløse Hud. Deres Indre var hos nogle 

 Individer fyldt med talrige, temmelig store, lidt ovale Æg 

 med hvid halvgjennemsigtig Blomme, og en kugledannet 

 Kimblære næsten af Æggets halve Diameter, hvori en rund 

 af mange Smaakorn fyldt mørkere Kimplet. Generations- 

 organerne indtage som sagt kun en ringe Del, omtrent den 

 forreste Sjettedel, af Dyrets Længde. Ved deres stærke 

 Forgrening afvige de fra samme af vore andre norske lunge- 

 og fodløse Holothurider, nemlig Synapta inhærens og Chi- 

 rodota pellucida, hos hvilke der i hvert af de 2 Partier 

 kun findes 2—5 Genitalrør, der ogsaa ere betydeligt længere 

 og forholdsvis langt tyndere (ogsaa hos de af Semper af- 

 bildede Arter af Synaptider eré de meget tynde), og synes 

 i denne Henseende mere at stemme overens med Myrio- 

 trochus og Eupyrgus. 



Kroppens Hud er, som allerede før anført, glasklar og 

 og oftest farveløs; kun hos et Par Individer havde den et 

 yderst svagt grøntlignende Anstrøg, som i den bageste Ende, 

 stundom ogsaa i den forreste, gik over til lys rødligt eller 



In front of the circular canal or above it, and within 

 the anterior margin of the calcareous ring, lies the nervous 

 ring (fig. 14, n). It is relatively not very thin, and rather 

 pentagonal; as there issue from its periphery 5 trunks 

 traversing the 5 radial pieces of the calcareous ring, con- 

 necting themselves each with its respective longitudinal 

 muscle of the body, and following the course of the same. 

 The organs of generation (fig. 1— *3, e, fig. 7, e) which 

 scarcely extend over the first sixth part of the length of 

 the body, are in younger specimens still smaller, and con- 

 sist of only some few tubes (in still younger specimens no 

 trace of such organs is perceptible). They form 2 symme- 

 trical parts (fig. 7, e) situated on each side of the intesti- 

 nal canal, close behind the calcareous ring on the dorsal 

 side of the animal. The stems of both these parts unite 

 in front in the central dorsal intermuscular space, forming 

 a single, rather short and narrow excretory canal (ibid, k) 

 which lies close to the inside of the skin of the body in 

 the dorsal mesentery (fig. 3, m), which fixes the first descen- 

 ding part of the intestine and distinctly appears through 

 the skin of the body, along the medial line of the said 

 intermuscular space; indicating the medial line of the ani- 

 mal, on both sides of which a bilateral symmetry of many 

 or most of the organs may be observed) and opens out- 

 wards, immediately behind or below the circle af tentacles, 

 on a small round papilla (fig. 1, 3, 7, f) which yét is some- 

 times very prominent above the surface of the skin, like a 

 cylindrical process 3 times as long as it is thick. Each 

 part, which in a developed state in specimens of middle 

 size is about 5. Mm. long, forms (fig. 7, e) a roundish dense 

 fascicle of numerous (I counted 30 — 40) mostly dichotomi- 

 cally ramified, rather thick round tubes which are all bran- 

 ches of a single thin stem that already at its base is divided 

 into 2 main branches. They are smaller at their source, 

 and thicker at their obtusely rounded extremity; the fore- 

 most are shorter: those further back gradually longer, and 

 of an opaque yellowish white color, shining clearly through 

 the colorless skin of the body. Their interior was in some 

 specimens filled with numerous, rather large, slightly oval 

 eggs with a white half transparent yolk, and a globular 

 germinative vesicle of nearly half the egg's diameter, 

 wherein a circular darker germinative spot filled with many 

 small granules. The organs of generation occupy as before 

 mentioned only a small part, about the anterior sixth part 

 of the animal's length. By their strong ramification they 

 differ from those of our other Norwegian lung-less and 

 foot-less Holothurians, namely Synapta inhærens and Chiro- 

 dota pellucida, in which there are found in each of the 2 

 halves only 2—5 genital tubes, which are also considerably 

 longer and relatively much thinner (they are likewise very 

 thin in the species of Synaptidæ delineated by Semper) 

 and they appear in this respect to agree more with the 

 Myriotrochus and Eupyrgus. 



The skin of the body is, as already mentioned, highly 

 pellucid and often colorless; only in a few specimens it 

 had an extremely faint greenish-gray tint, which at the 

 posterior extremity and sometimes also at the anterior 



