133 



Ende haardere, tykkere, mere coniske og antage en brunsort 

 Farve. Huden halv gjennemskinnende, saa at den mørke 

 Tarm kan skimtes. Snabelen, der er 9 Mm. lang, har ved 

 dens Grunddel et temmelig bredt Belte af tykke, stumpe, 

 fremragende, brunsorte Papiller (Fig. 22 p), medens den 

 øvrige Del er tæt besat med yderst fine Papiller, der give 

 den et villøst Udseende. Snabelens øverste Ende bærer 

 omtrent 16 tykke Tentakler, der sidde i én Kække om 

 Munden; og strax nedenfor Tentakelranden sees 4 lidt 

 uregelmæssige Rækker af tykke, meget krumme Hager 

 (Fig. 22 h, Fig. 24). Spiserøret kort, temmelig tyndt 

 (Fig. 23 sp), og gaar over i Tarmen ved at gjøre en 

 Bøiniiig mod Høire, hvorved Tarmen gaar igjennem den 

 spaltede Retractor (Fig. 23 t). Nu danner den et Par 

 Bugtninger (Fig. 23 t 1 ), stiger derpaa forover, gjør atter 

 nogle Slyngninger (Fig. 23 t 2 ), gaar saa langt bagover i 

 Linie med den korteste Retractor (Fig. 23 t 3 ), gjør en 

 temmelig stor Slynge, løber nu et godt Stykke forover, hvor 

 den paany bøier sig (Fig. 23 t 4 ), og idet den atter gaar 

 bagover, danner den 7—8 Slyngninger, der endelig gaa 

 over i en meget lang, tyk, næsten ligeløbende Rectum 

 (Fig. 23 r, r), som udmunder ved Grunden af Snabelen. 

 Spidsen af Tarmspiralenkommer saaledes til at ligge omtrent 

 i Midten af Kropshulheden (Fig. 23 t 4 ). Der er kun et 

 Segmentalorgan (Fig. 23 s), som er kort, tykt og ligger til 

 høire Side. Huden er forsynet med sine sædvanlige to 

 Muskellag. To Retractorer; deD ene, der tager sit Ud- 

 spring med en lidt bredere Basis omtrent paa Midten af 

 Kroppens bagerste Fjerdedel (Fig. 23 r 2 ), spalter sig — 

 efter at være naaet 6 — 8 Mm. forover — i to tykke Strenge 

 (Fig. 23 r 3 ), der atter henimod Spiserøret forene sig; 

 gjennem denne Spalte gaar en Tarmslynge, som ovenfor 

 omtalt. Den anden Retractor tager sit Udspring fortil 

 paa Kroppens bagerste Fjerdedel med to korte, men 

 stærke Rødder (Fig. 23 r 1 ), og gaar saa forover mod Spise- 

 røret, hvor den forener sig med den føromtalte, og dan- 

 ner ligesom en Skede om Spiserøret. Der findes intet 

 contractilt Kar. Nervestrengen løber som almindeligt 

 imellem begge Retractorer (Fig. 23 n, n). Kropshulhe- 

 den og de i den placerede Organer ere beklædte med 

 et celleholdigt Peritoneum, ligt det, vi have beskrevet i 

 den generelle Del, og som forøvrigt findes hos alle de 

 Phascolosoma-Arter, vi have undersøgt. 



Kroppen har en bleggul Farve. Snabelen brun med 

 hvidgule Tentakler. 1 Bergensfjorden paa 200 Favnes 

 Dyb, lerblandet Sand. Kun et Exemplar i Røret af Pec- 

 tinaria auricoma. 



ARTSCHARACTEREN. 



Kroppen 28 Mm. lang, tapformig, besat med adspredte, 

 i Spidsen fladtrykte, fremragende Papiller, der paa dens 

 bagerste afstumpede Ende ere tykkere, haardere og have 

 en brunsort Farve. Snabelen, 9 Mm. lang, er ved dens 

 Grunddel forsynet med et bredt Belte af brunsorte, tykke, 

 stumpe, fremragende Papiller, forøvrigt tæt besat med 



the posterior extremity harder, thicker, more conical, and 

 assume a brownish black color. The skin half-trans- 

 parent, so as to shew the dark intestine. The proboscis, 

 which is 9 Mm. long, has at its basal part a rather wide 

 belt of thick obtuse, prominent, brownish black papillæ 

 (fig. 22 p), while the remaining part is densely covered 

 with extremely fine papillæ which give it a villous appear- 

 ance. The upper extremity of the proboscis bears about 

 16 thick tentacles situated in a row round the mouth; 

 and immediately below the tentacular circlet, there appear 

 4 slightly irregular rows of thick, very much bent hooks 

 (fig. 22 h, fig. 24). The oesophagus is short, rather thin 

 (fig. 23 sp) and goes over into the intestine with a bend to 

 the right, whereby the intestine goes through the divided 

 retractor (fig. 23 t). Now it forms a few circumvolutions 

 (ß.g. 23 t 1 ), then rises forward, makes again some circum- 

 volutions (fig. 23 t 2 ), and then goes backward in a line 

 with the shortest retractor (fig. 23 t 3 ); makes a rather 

 large sling, and runs some distance forward, where it 

 turns once more (fig. 23 t 4 ), and returning backward again, 

 it forms 7 — 8 circumvolutions which finally go over into 

 a very long, thick, nearly straight rectum (fig. 23 r, r), 

 which has its orifice at the base of the proboscis. The 

 apex of the intestinal spiral comes thus to lie about in 

 the middle of the perivisceral cavity (fig. 23 t 4 ). There 

 is only one segmental organ (ß.g. 23 s), which is short, 

 thick and situated on the right side. The skin is fur- 

 nished with its usual two layers of muscles. Two retrac- 

 tors, one taking its issue with a little broader base, about 

 in the middle* of the posterior quarter of the body (fig. 

 23 r 2 ), divides itself — after having advanced forward 

 6 — 8 Mm. — into two thick cords (fig. 23 r 3 ), which again 

 unite towards the oesophagus; through this fissure goes 

 a sling of the intestine as before noticed. The other 

 retractor takes its issue forward on the posterior quarter 

 of the body, with two short but strong roots (ß.g t 23 r 1 ), 

 advancing towards the oesophagus, where it joins the 

 retractor first mentioned, forming, as it were, a sheath 

 round the oesophagus. There is no contractile vessel. 

 The nervous cord runs as usual between both retractors 

 (ß.g. 23 n, n). The perivisceral cavity and the organs 

 situated in it are covered with a peritoneum containing 

 cells like that described in the general notice, and which 

 moreover is found in all the species of Phascolosoma, 

 that we have examined. 



The body has a pale yellow color. The proboscis 

 brown, with whitish yellow tentacles. In the Bergensfjord 

 at the depth of 200 fathoms, sand mixed with clay. Only 

 one specimen in the tube of Pectinaria auricoma. 



SPECIFIC CHARACTERISTICS. 



The body 28 Mm. long, plug-shaped, covered with 

 dispersed prominent papillæ flattened at the point, and 

 at their posterior truncated extremity thicker, harder and 

 of a brownish black color. The proboscis 9 Mm. long, 

 and having at its basal part a broad belt of brownish 

 black, thick, obtuse, prominent papillæ, the remaining 



18 



