146 



hen til Dyrets forreste Ende, hvor den udmunder paa 

 Kygsiden omtr. 1 Mm. fra Mundaabningen. 



Der er kun et Segmentalorgan, der paa Midten er 

 udvidet og munder ud i Nærheden af Analaabnin- 

 gen (Fig. 16 s). Nervestrengen løber som sædvanligt 

 langs Bugfladen, er temmelig tyk, afgiver en Mængde Side- 

 grene til Huden, Segmentalorganet, Spiserøret (Fig. 16 

 n, n). Paa dettes forreste Del danner Nerven en ganglio- 

 nær Opsvulmen, hvorfra udsendes baade fortil og bagtil 

 fiere Grene, af hvilke en meget tyk følger Tarmrøret og 

 afgiver Sidegrene til dette. 



Kropshulheden er forsynet med et Peritoneum, ligt 

 det hos Phascolosomaerne tidligere beskrevne, hvilket be- 

 klæder de i Hulheden indesluttede Organer. 



Dyrets Farve er lysegul med mørkebrune Papiller 

 paa dets forreste Ende, Kun to Exemplarer have vi 

 fundet, det ene i Dalsfjorden (Søndfjord), det andet 

 i Herløfj orden (Bergen) paa 50 — 80 Favnes Dyb, stenet 

 Grund. 



ARTSCHARACTEREN. 

 Legemet er omtrent 4 Gange saa langt som bredt. 

 Papillerne paa begge Endepartier meget tætstaaende, 

 fremragende og conisk tilspidsede; paa den øvrige Del 

 af Kroppen runde, fladtrykte. Den bagerste Ende forsy- 

 net med en Grube. Farven lysegul med mørkebrune Pa- 

 piller paa den forreste Ende. En Retractor. Et Seg- 

 mentalorgan. 



FORKLARING OVER FIGURERNE. 



Tab. 13, Fig. 12. Tylosoma Lütkenii i naturlig Størrelse. 

 Fig. 13. Forstørret. 



A. Kropspapiller under Loupeforstørrelse. 



B. Papiller paa den bagerste Ende af Kroppen ; samme 

 Forstørrelse. 



C. Papiller paa forreste Ende; forstørret. 



Tab. 14, Fig. 16. Tylosoma Lütkenii, aabnet fra Bugen og for- 

 størret, m Muskelfibre; n, n Nerve; ngr Nervegrene; 

 r,r,r Retractor; re, re Rectum; s Segmentalorgan; t, £ løse 

 Tarmslynger; ts spiralförmig Tarmslynge; sp, sp Spiserør. 



PRIAPULIDÆ. 



PR1APULOIDES, Nobis. 



SLÆGT SCHARACTEREN. 



Legemets forreste Del danner Snabelen. Munden 



forsynet med Tænder. Analaabningen i den bagerste Ende 



og paa hver Side af den et langt cylindrisk Tilhæng 



(Gjælle?), besat med Blærer. Genitalporerne nedenfor og 



til Siden af Anus. 



now 3—4 spiral circumvolutions (fig. 16 ts) — - goes 

 again over the retractor's roots to the left side, where 

 it is attached by several strong fibres to the wall of the 

 body (fig. 16 m); hence it goes in a very crooked line 

 along the dorsal surface, as rectum (fig. 16 re, re), to the 

 anterior end of the animal, where it has its orifice on 

 the dorsal side about 1 Mm. from the oral aperture. 



There is only one segmental organ, which in the 

 middle is strongly enlarged, and has its orifice in the 

 vicinity of the anal aperture (fig. 16 s). The nervous 

 cord runs as usual along the ventral surface ; it is rather 

 thick, and furnishes a number of lateral branches to the 

 skin, to the segmental organ and to the oesophagus 

 (fig. 16 n, n). On the anterior part of the latter, the 

 nerve forms a ganglionous swelling, from which there 

 issue both forward and backward several branches. One 

 of these is very thick; it accompanies the intestinal canal 

 and furnishes lateral branches to it. 



The periviceral cavity is provided with a peritoneum, 

 like that previously described in the Phascolosomas, 

 which covers the organs inclosed in the cavity. 



The color of the animal is light yellow, with dark 

 brown papillæ on its anterior extremity. We have only 

 found two specimens, one in Dalsfjord (Søndfjord), the 

 other in Herlöfjord (Bergen) in 50 — 80 fathoms depth, 

 stony bottom. 



SPECIFIC CHARACTERISTICS. 

 The body about 4 times as long as wide. The pa- 

 pillæ on both extreme parts standing very closely together, 

 prominent and conically tapered; on the other part of 

 the body, round and flattened. The posterior end having 

 a hollow. The color light yellow with dark brown papillæ 

 in the anterior extremity. One retractor. One segmen- 

 tal organ. 



EXPLANATION OF THE FIGURES. 



Tab. 13, fig. 12. Tylosoma Lütkenii, natural size. 

 Fig. 13. Magnified. 



A. Papillæ of body under magnifying glass. 



B. Papillæ on the posterior extremity of body, lame 

 magnifying power. 



C. Papillæ on the anterior extremity, magnified. 



Tal). 14, fig. 16. Tylosoma Lütkenii opened from the ventral side, 

 magnified, m muscle fibres ; n, n nerve ; ngr nerve-branches ; 

 r, r, r retractor ; re, re rectum ; s segmental organ; t,t loose 

 circumvolution of intestine; ts spiral circumvolution of 

 intestine ; sp, sp oesophagus. 



PRIAPULIDÆ. 

 PB1APUL01DES, Nobis. 

 GENERIC CHARACTERISTICS. 

 The anterior part of the body forms the proboscis. 

 The mouth furnished with teeth. The anal aperture in 

 the posterior extremity, and on each side of it a long 

 cylindrical appendage (gill?) covered with vesicles, 

 genital pores below, and on the side of the anus. 



The 



