59 



langstrakt, 4—5 Gange længere end bred, næsten overalt 

 af ens Brede og i begge Ender stumpt tilrundet. Formen 

 er imidlertid ikke som hos den egentlige Slægt Holothuria 

 cylindrisk, men næsten prismatisk eller rettere firsidet, 

 idet Rygsiden er stærkt hvælvet og steilt affaldende til 

 hver Side, medens Bugsiden er ganske flad. Ryg og Bug 

 ere overalt skarpt adskilte fra hinanden. Hvor nemlig 

 -disse støde sammen, ere Siderandene saavelsom den for- 

 reste og bageste Rand stærkt, næsten membranagtigt 

 uddragne, hvorved fremkommer et Slags finneagtig Udbred- 

 ning, der løber rundt det hele Legeme (se ogsaa Fig. 20 

 og 21), og som især i den forreste Del er meget tyde- 

 lig. — Kroppen bærer 2 forskjellige Slags Ambulacral- 

 vedhæng, nemlig paa Ryggen lutter coniskt tilspidsede 

 „Ambulacralpapiller", paa Bugen derimod cylindriske, i 

 Enden afstudsede „Ambulacralfødder." Ordningen af disse 

 Vedhæng varierer noget hos de forskjellige Individer, 

 men ere dog i sine Hovedtræk overensstemmende hos 

 alle. Paa Ryggen bemærkes (Fig. 18, 19) 2 langs Siderne 

 over de tvende dorsale Længdemuskler beliggende Læng- 

 destrøg (Ambulacrer) af temmelig store vorteformige For- 

 høininger, der danne 2 uordentlige Længderader i hvert 

 Strøg. Disse Forhøininger ere i Enden mere eller mindre 

 stærkt uddragne til coniskt tilspidsede Papiller, hvoraf 

 altid nogle faa (Fig. 18 c c) (4—6 paa hver Side) ere be- 

 tydeligt stærkere forlængede end de øvrige og indtil 7 — 8 

 Mm. lange. Langs ad Midten af Ryggen findes vistnok 

 ogsaa nogle faa adspredte Ambulacralpapiller, men disse 

 ere altid betydeligt mindre end de øvrige. En enkelt 

 uafbrudt Rad af smalt tilspidsede Ambulacralpapiller (Fig. 

 18, 21 d) findes desuden langs Kroppens dorso-ventrale 

 Rand). 



Paa Bugsiden findes (Fig. 21) ingen „Ambulacral- 

 papiller", men blot „Ambulacralfødder" eller Sugefødder 

 é(ee), hvilke ere meget mindre end hine, simpelt cylin- 

 driske og paa Enden forsynede med en af en Kalk- 

 plade støttet Sugeskive (Fig. 26). De danne i Regelen 

 her 2 Længdestrøg (Ambulacrer), et paa hver Side af 

 Bugen over de laterale Længdemuskler, og i hvert Strøg 

 dannende 3 eller 4, dog meget uordentlige Længderader. 

 Paa Bugens Midte eller langs den der løbende uparrede 

 Længdemuskel findes derimod hos de allerfleste Exem- 

 plarer ikke det mindste Spor af Ambulacralfødder, og 

 hvor de ere tilstede her, ere de altid yderst faa i Antal, 

 og ogsaa betydeligt mindre end de i de laterale Strøg. 

 — Ved Længdemusklernes og Ambulacrernes Stilling er 

 saaledes et Bivium og Trivium givet; det første indtager 

 Ryggen, det sidste, hvis midterste Ambulacrum dog of- 

 test fattes, indtager Bugen. 



Munden (Fig. 21 o), som ligger ganske ventralt paa 

 -den nedre Side af den forreste Ende, er omgiven af en 

 Kreds af 20 Tentakler (tt). Disse ere (Fig. 23) af en 

 lignende Form som hos den egentlige Slægt Holothuria, 



broad, nearly everywhere of the same breadth, and at both 

 extremities obtusely rounded. The shape is however not 

 cylindrical, as in the proper genus Holothuria, but nearly 

 prismatic or more correctly four-sided; the back being 

 strongly convex, with a steep incline to each side, while the 

 belly is quite flat. Back and belly are everywhere sharply 

 distinguished from each other. Where they meet, the 

 lateral margins, as well the anterior as the posterior 

 margin, are drawn out strongly almost like membranes, 

 whereby a sort of fin-like enlargement is produced ex- 

 tending round the whole body (see also fig. 20 & 21) 

 and especially distinct in the anterior part. — The body 

 bears 2 different sorts of ambulacral appendages; namely, 

 on the back only conically pointed "ambulacral papillæ" 

 but on the belly cylindrical "ambulacral feet" truncated 

 at the extremities. The arrangement of these appendages 

 is somewhat various in different specimens; but in the 

 main points it is similar in all. On the back there are 

 (fig. 18, 19) 2 longitudinal streaks (ambulacra) situated 

 along the sides and above the two dorsal longitudinal 

 muscles, of rather large wart-like prominences which 

 form 2 irregular longitudinal rows in each streak. These 

 prominences are at the extremity more or less strongly 

 drawn out in the form of conically pointed papillæ, of 

 which always some few (fig. 18, cc, 4 — 6 on each side) 

 are considerably more elongated than the others, and 

 up to 7-8 Mm, long. Along the middle of the back 

 there are certainly also some few scattered ambulacral 

 papillæ; but these are always much smaller than the 

 others. There is moreover a single unbroken row of 

 small pointed ambulacral papillæ (fig. 18 — 21 d) along 

 the dorso-ventral margin of the body (on the lateral 

 margins, as well as on the anterior and posterior 

 margins). 



On the ventral side (fig. 21) there are no "ambula- 

 cral papillæ", but only "ambulacral feet" or suckers (ee) 

 which are much smaller than the former, simply cylindri- 

 cal, and provided at the extremity with a suction disc 

 (fig. 26) strengthened by a calcareous plate. They 

 usually form here 2 longitudinal streaks (ambulacra) one 

 on each side of the belly above the lateral longitudinal 

 muscles, and in each streak 3 or 4, but very irregular, 

 longitudinal rows. But in the middle of the belly, or along 

 the unpaired longitudinal muscle there situated, not the 

 smallest trace of ambulacral feet is in most specimens 

 to be found, and where such feet exist in this region, 

 they are always extremely few in number, and also con- 

 siderably smaller than in the lateral streaks. The posi- 

 tion of the longitudinal muscles and the ambulacra esta- 

 blishes therefore a bivium and a trivium; the former 

 occupies the back: the latter, of which the medial am- 

 bulacrum is however most frequently wanting, occupies 

 the belly. 



The mouth (fig. 21 o) which is situated quite ven- 

 trally on the lower side of the anterior extremity, is sur- 

 rounded by a circle of 20 tentacles (tt). These (fig 23) 

 are in shape similar to those of the proper genus Holo- 



8* 



