147 



PR1APUL0WES TYP1CUS, Nobis 

 (Tab, 16, Fig. 10-14.) 

 Priapulus bicaudatus, Danielssen. 

 Forhandlinger ved de skandinaviske Naturforskeres tiende Møde, 

 Christiania, 1868, Pag. 542. 



Legemet cylindrisk, forsynet i dets bagerste Ende 

 med to cylindriske Tilhæng, besatte med Blærer. 



Dyrets hele Længde omtr. 60 Mm. Snabelen (Glans) 

 er 16 Mm. lang, omtr. 18 Mm. i Omfang, har 25 efter 

 Længden løbende Ribber, der ere besatte med hornagtige 

 Spidser, som sidde i en Række paa Høiden af hver Ribbe, 

 saaledes at en stor Spids afVexler med mindre Spidser. 

 I Almindelighed svare 2, en stor og en liden Spids, til den 

 indenfor Huden liggende Ringmuskel, ligesom hver Ribbe 

 svarer til den indenfor værende Længdemuskel. Ribbene 

 staa lige langt fra hinanden, naar undtages de to midter- 

 ste paa Bugfladen, hvilke slutte sig næsten ganske sam- 

 men; Mellemrummene ere lidt fordybede. Paa den lige- 

 som tvers afskaarne forreste Ende af Dyret (Snabelen) 

 findes den runde Mundaabning omgivet af en temmelig 

 bred, fast Vold, der ved en Fure skiller Mundpartiet fra 

 Snabelen. Denne, der bagtil bliver noget smalere, gaar 

 med en liden Fordybning over i Kroppen, som er 24 Mm. 

 lang, og omtrent 14 Mm. i Omfang, og dannes af indtil 

 40 temmelig tydelig udprægede Ringe, hvoraf hver Ring, 

 indtil de 6 bagerste, er besat med afstunrpede Spidser, 

 som staa meget vidt fra hinanden (omtrent 12 paa hver 

 Ring). De 6 bagerste Ringe, der ere ligesaa fremsprin- 

 gende som de øvrige, ere paa deres nederste (bagerste) 

 Rand forsynede med tætstaaende, store, hornagtige Spid- 

 ser, hvorved disse Ringe adskille sig fra alle de andre. 



I Furen foran disse 6 sidste Ringe sees enkelte Papil- 

 ler af et lidet Knappenaalshoveds Størrelse. Kroppens 

 bagerste Ende er noget afstumpet, og paa Midten findes en 

 cirkelrund Aabning, Anus, forsynet med en Slutmuskel, 

 som, idet Excrementerne gik igjennem den, indtog om- 

 trent 3 Mm. i Diameter. Fra denne Aabning sees paa 

 Huden en fin Søm, der gaar langs Bugfladen op igjennem 

 Legemet og Snabelen ligetil Mundvolden, og som fremkom- 

 mer ved den indenfor liggende hvide Nervestreng. Paa 

 hver Side af Anus udspringer et cylindrisk Rør (Dyrets 

 Haledel, Appendix), som er 20 Mm. langt, omtrent 5 Mm. 

 i Omfang, og paa hvis bagerste., afrundede, butte Ende er 

 en rund Aabning, der udvider og sammentrækker sig, og 

 som omgives af en tynd Vold. I udvidet Tilstand er 

 Aabningen omtrent 1 Mm. i Diameter. Dette Rør er ind- 

 til omtrent 3 Mm. fra den bagerste Ende tæt besat med 

 store ægformige Blærer, der staa temmelig regelmæssig 

 omkring Stammen saaledes, at 5 store afvexle med 5 smaa ; 

 de forreste Blærer ere dog de mindste. Disse Blærer, 

 der ere paa deres ydre Flade besatte med smaa Papiller, 

 kunne udvide og sammentrække sig, og ere i udvidet Til- 

 stand temmelig gjennemsigtige. 



PR1APUL01DES TYPICUS, Nobis. 

 (Tab, 16, fig. 10—14.) 

 Priapulus bicaudatu$ } Danielssen. 

 Forhandlinger ved de skandinaviske Naturforskeres tiende Møde ? 

 Christiania, 1868, p. 542. 



The body cylindrical, having at its posterior extre- 

 mity two cylindrical appendages, covered with vesicles. 



The whole length of the animal is about 60 Mm. 

 The proboscis (glans) is 16 Mm. long, and about 18 Mm. 

 in circumference; it has 25 ribs running longitudinally, 

 and covered with horn-like points, which stand in a row 

 on the height of each rib; so that a large point alter- 

 nates with smaller points. Usually 2, a large and a small 

 point, correspond with the annular muscle situated inside 

 the skin; as also each rib answers to the corresponding 

 longitudinal muscle inside. The ribs are equidistant from 

 each other, excepting the two middle ones on the ven- 

 tral surface, which are nearly close together. The 

 intervals are a little excavated. On the anterior 

 extremity of the animal, which is, as it were, truncated 

 (the proboscis) there is the circular oral aperture sur- 

 rounded by a rather broad, firm ridge, which by a furrow 

 divides the oral part from the proboscis. The latter, 

 which becomes somewhat narrower behind, goes, with a 

 little furrow, over into the body, which is 24 Mm. long 

 and about 14 Mm. in circumference, and is formed of a 

 number of up to 40 rather distinctly marked rings, of 

 which each ring, until the 6 posterior ones is covered 

 with truncated points standing very far from each other 

 (about 12 on each ring). The 6 posterior rings, which 

 are as prominent as the others, are on their lower 

 (posterior) margin fournished with large horny points, 

 whereby these rings are distinguished from all the others. 



In the furrow before these 6 last rings, there appear 

 a few papillæ of the size of a small pin's head. The 

 posterior end of the body is somewhat truncated, and in 

 the middle there is a circular aperture (anus), which is 

 provided with a closing muscle, and which, when the 

 excrements went through it, occupied about 3 Mm. in 

 diameter. From this aperture there is on the skin a 

 fine suture, going along the ventral surface, through the 

 body and the proboscis right up to the oral ridge, and 

 produced by the white nervous cord lying inside. On 

 each side of the anus there issues a cylindrical tube (the 

 caudal part of the animal, appendix), which is 20 Mm. 

 long and about 5 in circumference, having on its poste- 

 rior rounded obtuse extremity a round aperture, which 

 extends and contracts itself, and which is surrounded by 

 a thin ridge. When extended, the aperture is about 

 1 Mm. in diameter. This tube is, up to about 3 Mm. 

 from its posterior extremity, thickly covered with large 

 oval vesicles situated rather regularly round the stem; 

 so that 5 large ones alternate with 5 small ones; the 

 anterior vesicles are however the smallest. These vesicles 

 which are on their outer surface covered with small pa- 

 pillæ, can extend and contract themselves; and they are 

 when inflated rather transparent. 



