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tidligere beskrevne fine Aabning nedenfor Anus. Lige i Bun- 

 den af Kropshulheden findes paa hver Side af Rectum 

 en rund Aabning, der er omgiven af en liden Vold, og som 

 fører ind til de,n saakaldte Hale (Appendix), det tidligere 

 cylindriske Rør. Paa dettes indre Flade, der er stærkt 

 musculøs, iagttages en Mængde fine Aabninger, som føre 

 ind til de ægformige Blærer. Disse ere ligeledes paa 

 deres indre Flade forsynede med en Mængde Muskelfibre. 



Foruden Ring- og Længdemusklerne, der ligge paa 

 Dyrets indvendige Flade, er Snabelen forsynet med lange 

 og korte Retractorer. Af de lange, som ere 8 i Tallet, 

 temmelig brede, tage 4 deres Udspring rundt om Rectum 

 lige i Bunden af Kropshulheden, medens 4 udspringe 

 omtr. 4—5 Mm. foran; alle løbe de forover og fæste sig 

 omkring den forreste Ende af Svælget. De korte Retrac- 

 torer ere 10 — 12, udspringe paa Grændsen mellem Sna- 

 belen og Kroppen, og fæste sig lige ved Siden af de lange. 

 Paa Bugfladen, just der hvor den tidligere beskrevne Søm 

 findes paa Huden, løber Nervestrengen fra Anus langs 

 den indvendige Flade af Legemet til den forreste Ende 

 af Snabelen, hvor den deler sig i to Grene, der omfatte 

 Svælget. Hele Kropshulheden og Snabelen er beklædt af 

 et Peritoneum. 



Af Priapuloides typicus er fundet kun 2 Exemplarer i 

 Varangerfj orden (Østfinmarken) paa 120 Favnes Dyb. 

 Dyret lever paa Lerbund. Leret, hvori det er nedgravet, 

 har en svag rosenrød Farve. I levende Live er Dyrets 

 Farve hvidgul. De tvende Tilhæng (Haler) udvide og 

 sammentrække sig samtidigt og regelmæssigt, og naar 

 Aabningen paa Cylinderens bagerste Ende udvider sig, 

 udspændes Blærerne og blive gjennemsigtige. Udvidnin- 

 gen og Sammentrækningen af den yderste Aabning og 

 Blærerne vare fuldkommen rhythmiske, mellem 40 og 50 i 

 Minuttet, og lignede Aandedrættet hos Holothurierne. 



ARTSCHARACTEREN. 

 Legemets Længde 60 Mm. Snabelen 25 Længderib- 

 ber, besatte med afvexlende større og mindre Pigge. 

 Kroppen indtil 40 Ringe, hvoraf de 6 bagerste ere paa 

 deres nederste Rand besatte med Pigge. Mundaabningen 

 rund. I Svælget 8 Rækker Tænder; i de 4 første har 

 hver Tand en stor Midtspids med 12—14 Sidespidser; i 

 de 4 bagerste er der ligeledes en Midtspids med 12—16 

 Sidespidser. 8 lange, 10—12 korte Retractorer. Af de 

 S lange tage 4 deres Udspring i Bunden af Kropshul- 

 heden rundtom Rectum; de andre 4 udspringe omtrent 

 4 Mm. foran. 



On each side of the rectum there is an oblong, leaf- 

 shaped, lobed organ (the sexual organ) about 20 Mm. 

 long, and in its greatest breadth about 4 Mm. Its an- 

 terior free end is conically tapered. Its posterior broader 

 part goes successively over into a rather thin, round 

 excretions-canal issuing in the previously described fine 

 aperture below the anus. Innermost at the bottom of 

 the perivisceral cavity, there is on each side of the rectum 

 a circular aperture, surrounded by a little ridge and 

 leading into the so-called tail (appendix), the cylindrical 

 tube previously described. On the inner surface of 

 this, which is strongly muscular, there were observed a 

 number of fine openings leading into the oval vesicles. 

 The latter are likewise, on their interior surface, provided 

 with a number of muscular fibres. 



Besides the annular and longitudinal muscles situated 

 on the interior surface of the animal, the proboscis is 

 also furnished with long and short retractors. Of the 

 long ones, which are 8 in number and rather broad, 4 

 take their origin round about the rectum, just at the 

 bottom of the perivisceral cavity; while 4 issue about 

 4 — 5 Mm. in front; all run forward and insert themselves 

 around the anterior extremity of the gullet. The short 

 retractors are 10 — 12, and issue on the border between 

 the proboscis and the body, inserting themselves just at 

 the side of the long ones. On the ventral surface, ex- 

 actly where the suture previously described appears on 

 the skin, the nervous cord runs from the anus along the 

 interior surface of the body to the anterior end of the 

 proboscis, where it divides itself into two branches en- 

 circling the gullet. The whole perivisceral cavity and 

 the proboscis are covered with the peritoneum. 



Of the Priapuloides typicus, only 2 specimens have 

 been found in the Varangerfj ord (East Finmark) at the 

 depth of 120 fathoms. The animal lives on clayey bot- 

 tom. The clay wherein it is buried has a pale rosy color. 

 The color of the living animal is whitish yellow. The 

 two appendices (tails) extend and contract themselves 

 simultaneously and regularly; and when the aperture on 

 the posterior end of the cylinder expands, the vesicles 

 are inflated and become transparent. The expansions and 

 contractions of the exterior opening and of the vesicles 

 were quite rhythmical and about 40 — 50 in the minute, 

 resembling the breathing in the Holothuriæ. 



SPECIFIC CHARACTERISTICS. 

 The length of the animal 60 Mm. The proboscis has 

 25 longitudinal ribs covered with alternating larger and 

 smaller spines. The body has up to 40 rings, of which 

 the 6 posterior are on their lower margin covered with 

 spines. The oral aperture, round. In the gullet 8 rows 

 of teeth; in the 4 first, each tooth has a large middle 

 point with 12 — 14 lateral points; in the 4 posterior it 

 is likewise a middle point with 12 — 16 lateral points; 

 8 long, 10—12 short retractors. Of the 8 long, 4 take 

 their issue at the bottom of the perivisceral cavity round 

 the rectum, the other 4 issue about 4 Mm. in front. 



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