62 



Krone), kun endel mindre. Endelig er Endeskiven (Suge- 

 skiven) støttet af et sammenhængende Kalknæt, der ind- 

 tager hele dens Flade, Lignende Tverstykker som de i 

 Ambulacralvedhængene findes ogsaa i Huden af Tentak- 

 lerne, i hvis grenede Endeflige de ligeledes blive stærkere 

 bueformigt bøiede og meget smaa (Fig. 36). 



Blandt de ved Lofoten indsamlede Exemplarer fand- 

 tes ogsaa en liden Unge (Fig. 37, 38) af denne Art. Den 

 er i contraheret Tilstand (i Spiritus) 3 Mm. lang og over- 

 alt 1| Mm. bred, og hvidagtig gjennemsigtig uden Pig- 

 mentering. Antallet af Ambulacralpapiller og Ambulacr al- 

 fødder var meget ringe. Paa hver Side af den stærkt 

 hvælvede Kyg sees nemlig en Længderad af 4 eller 5 

 conisk-tilspidsede Ambulacralpapiller (Fig. 37, c c), der ere 

 temmelig lange, især den forreste, som sidder helt fremme 

 paa det forreste Hjørne og omtrent er f Mm. lang; kun 

 nogle faa, lidet tydelige og meget smaa findes spredte 

 hist og her paa Ryggen. Paa den affladede Bug findes 

 paa hver Side en enkelt Længderad Ambulacralfødder 

 (Fig. 38 e e) (6 i den ene og 7 i den anden), der staa 

 tættere sammen i den bageste Del af Kroppen, længere 

 fra hinanden i den forreste Del, og desuden i den ba- 

 geste Halvdel af Kroppen en Midtrad af 3 Ambulacral- 

 fødder (det midterste i Regelen manglende Ambulacrum 

 af Trivium). Disse Fødder ere cylindriske med cirkelrund 

 flad Endeskive. Munden sidder skraat paa Bugsiden af 

 Kroppens forreste Ende og er omgiven af en Krands af 

 kun 9 Tentakler (Fig. 33 t), af hvilke den ene, som sid- 

 der bagtil i Midten, er meget mindre end de øvrige 8, 

 der alle ere omtrent lige store; deres udvidede, skjold- 

 formigt-grenede Ende, som synes at være mindre delt 

 end hos den voxne, er opak hvid. Tarmcanalen skinner 

 ved dens mørke sortagtige Indhold klart igjennem den 

 transparente Hud. — Kalklegemerne i Huden med deres 

 langt over Hudens Overflade fremragende taarndannede 

 Krone, som drager med sig Huden ud i en temmelig høi 

 conisk Papille (Fig. 40, 41, a), ere ved Hudens fuld- 

 komne Gjennemsigtighed særdeles iøinefaldende, især paa 

 de store Ambulacralpapiller (se Fig. 40), og afgive et 

 meget smukt mikroskopiskt Skue. De stemme fuldkom- 

 men overens med samme af det voxne Dyr og ere ogsaa 

 allerede af samme Størrelse som hos dette. 



Nærværende Form ligner, som man vil have seet, af 

 vore nordiske Holothurider mest Holothuria tremula Gun- 

 nerus (H. elegans, O. Fr. Müller), fra hvilken den afviger 

 ved den ved de stærkt uddragne dorso-ventrale Rande 

 udprægede skarpere Adskillelse af Ryg- og Bugsiden, ved 

 den ringere Udvikling af Skiven i Hudens Kalklegemer, 

 og fornemmelig ved den fra disse sig hævende Krones 

 betydeligere Høide, smalere Form og Mangel af Torne, 

 endelig ogsaa ved Farven, der altid er uniform kjødrød 



in the exterior layer of the skin, scattered, or not very 

 numerous calcareous corpuscles, like those above descri- 

 bed (with a cruciform disc and tower-like crown) only 

 rather smaller. Finally the terminal disc (suction disc) 

 is supported by a continuous calcareous net occupying 

 the whole of its surface; similar transverse pieces to those 

 of the ambulacral appendages are also found in the skin 

 of the tentacles, in the ramified branched terminal lobe 

 of which they are also more strongly curved and very 

 small (fig. 36). 



Among the specimens collected at Lofoten there was 

 also found a quite young animal (fig. 37, 38) of this 

 species. It is in a contracted state (in spirit) 3 Mm. 

 long and everywhere 1^ Mm. broad, and whitish-trans- 

 parent without pigmentation. The number of the ambu- 

 lacral papillæ and ambulacral feet was very small. On 

 each side of the strongly convex back, there appears a 

 longitudinal row of 4 or 5 conically pointed ambulacral 

 papillæ (fig. 37, c c) which are rather long, especially the 

 anterior one situated quite in «front on the anterior cor- 

 ner and about § Mm. long; only some few not very 

 distinct and very small are found scattered here and 

 there on the back. On the flattened belly there is on 

 each side a single longitudinal row of ambulacral feet 

 (fig. 38, e e) (6 in one row and 7 in the other) which 

 are closer together in the posterior part of the body, 

 and further from each other in the anterior part; and 

 there is besides, in the posterior half of the body, a 

 medial row of 3 ambulacral feet (the central usually 

 wanting ambulacrum of the trivium). These feet are cy- 

 lindrical with a circular flat terminal disc. The mouth 

 is situated obliquely on the ventral side of the anterior 

 extremity of the body, and is surrounded by a circle of 

 only 9 tentacles (fig. 38, t) of which one, situated behind 

 in the centre, is much smaller than the other 8 which 

 are nearly similar to each other; their enlarged scuti- 

 form-ramified extremity, which appears to be less divided 

 than in the adult specimens, is opaque white. The 

 intestinal canal shines, with its dark blackish contents, 

 distinctly through the transparent skin. The calcareous 

 corpuscles in the skin with their tower-like crown project- 

 ing far above the surface, pushing out the skin into a 

 rather high conical papilla (fig. 40, 41 a) are, by reason 

 of the perfect transparence of the skin, strikingly re- 

 markable, especially on the large ambulacral papillæ (see 

 fig. 40) and afford a very beautiful microscopic spectacle. 

 They agree completely with, and are also already of the 

 same size as those of the adult animal. 



The present form bears, as has been shown, a 

 greater resemblance to the Holothuria tremula Gunnerus 

 (H. elegans 0. Fr. Müller) than to any other of our nor- 

 thern Holothurians ; differing from it by the sharper 

 distinction of back and belly marked by the strongly 

 drawn out dorso-ventral margin, by the smaller develop- 

 ment of the disc in the calcareous corpuscles of the skin, 

 and chiefly by the greater height, thinner form, and 

 smooth exterior of the towers which rise from the discs, 



