127 



Kroppen derimod vige Bundterne fra hverandre og danne 

 ,der tydelige Mellemrum, der næsten ganske forsvinde, 

 efter at Muskelbundterne ere gaaede over paa Glans. Her 

 dele de sig i to, og udbrede sig nu som tynde Strenge 

 lige til den bagerste Ende. Imellem disse tvende Mu- 

 skellag findes det tredie, der danner Skraamuskler, som 

 bestaa af småle Muskelstrenge, der staa meget langt fra 

 hverandre, og udgjøre neppe mere end det halve Antal 

 af Længdemusklernes. Kropshulheden og de i den inde- 

 sluttede Organer ere beklædte med et Peritoneum, hvori 

 findes Celler og spredte Muskelfibre. — 4 Retractorer, 

 der hver tage sit Udspring fra 3 Længdemuskler, et 

 lidet Stykke bagenfor Analaabningen, og løbe adskilte 

 lige til Snabelens Ende, hvor de fæste sig omkring Ten- 

 takelmenbranens Grunddel. Fra en af Længdemusklerne 

 udspringer den saakaldte Spindelmuskel med stærke Fibre, 

 gaar over paa Endetarmen for senere som sædvanligt at 

 løbe bagtil som Støtte for Tarmspiralen. Spiserøret, kort, 

 cylindrisk, gaar noget til Høire over i Tarmen, der dan- 

 ner nogle S-formige Bøininger. førend den gaar over i 

 den egentlige Tarmspiral. Denne ender i en temmelig 

 lige Kectum, som udmunder paa Ryggen. Ved Analaab- 

 ningen sees paa Endetarmen 2 smaa kjertelformige Or- 

 ganer, og strax nedenfor disse en liden Divertikel. Tarm- 

 slyngningerne, ligesom Rectum, ere ved mange Bindevævs- 

 traade fæstede til Kropshulheden. Langs Spiserøret fin- 

 des paa hver Side et slangeformigt, contractilt Kar med 

 sin frie Ende bagtil, medens det fortil er fæstet til Ten- 

 takelmembranen. Segmentalorganerne danne to lang- 

 strakte, gjennemsigtige Blærer, der ere meget contractile. 

 Nervestrengen, der i den bagerste afrundede Krop sende 

 danner en bulbøs Opsvulmen, gaar fortil, idet den ud- 

 sender til begge Sider en Mængde Grene, og slaar sig til 

 Slutning omkring Spiserøret for der at danne den sæd- 

 vanlige Nervering. 



Farven er gulhvid, perlemor-glindsende. Snabelen 

 lidt mørkere. — Forekommer sjelden i Korsfjorden ved 

 Bergen og i Søndfjord paa en Dybde af 100 — 150 Favne, 

 leret Bund. 



ARTSCHARACTEREK 



Kroppen cylindrisk med 24 stærke Længderibber. 

 Snabelen omtr. 1 / 3 af Kroppens Længde, forsynet med 

 talrige, fremstaaende Papiller. Glans stærkt udpræget 

 med en fri Vold, der omslutter Ryg og Sider, men som 

 paa Midten af Bugfladen danner en Fure. 3 Muskellag: 

 Ring-, Skraa- og Længdemuskler. 



nearly a continuous muscular membrane. The longitudinal 

 muscles are 24 in number, and appear in strong fascicles, 

 which are completely separate over the whole body. On 

 the proboscis however the one fascicle lies close to the 

 other; but on the body, the fascicles recede from each 

 other and form evident intervals, which disappear almost 

 entirely after the muscular fascicles have gone over to 

 the glans. Here they divide themselves in two, and 

 extend now, as thin cords, even up to the posterior 

 extremity. Between these two layers of muscles, there 

 is the third, which forms oblique muscles consisting of 

 narrow muscular cords standing very distant from each 

 other, and scarcely half as numerous as the longitudinal 

 muscles. The perivisceral cavity and the organs con- 

 tained in it are covered with a peritoneum, wherein are 

 found cells and dispersed muscular fibre. 4 Retractors, 

 each of which issues from 3 longitudinal muscles, a 

 little way behind the anal aperture, running separate 

 even to the end of the proboscis, where they are attached 

 round about the basal part of the tentacular membrane. 

 From one of the longitudinal muscles, there issues the 

 so-called fusiform muscle, with strong fibres going over 

 to the rectum, and afterwards, as usual, running back- 

 wards as support for the intestinal spiral. The oesopha- 

 gus, short cylindrical, goes somewhat to the right over 

 into the intestine, which forms some ^-shaped bends, 

 before going over into the proper intestinal spiral. The 

 latter terminates in a rather straight rectum, which has 

 its orifice on the back. At the anal aperture there appear 

 on the rectum 2 small gland-shaped organs, and immedi- 

 ately below these a little diverticle. The circumvolutions 

 of the intestine, as also the rectum, are attached, by 

 many filaments of connecting tissue, to the perivisceral 

 cavity. Along the oesophagus, there is on each side a 

 serpentine, contractile vessel, with a free posterior ex- 

 tremity; while the anterior extremity is attached to the 

 tentacular membrane. The segmental organs form two 

 elongated transparent vesicles, which are very contractile. 

 The nervous cord, which in the posterior rounded ex- 

 tremity of the body forms a bulbous swelling, goes for- 

 ward, sending out on both sides a number of branches, 

 and winds itself at last round the oesophagus, forming 

 there the usual nerve-ring. 



The color is yellowish white, shining like mother of 

 pearl. The proboscis a little darker. Occurs rarely, in 

 the Korsfjord at Bergen and in Søndfjord, at the depth 

 of 100 —150 fathoms, clayey bottom. 



SPECIFIC CHARACTERISTICS. 



The body cylindrical with 24 strong longitudinal ribs, 

 The proboscis about V 3 of the length of the body, fur- 

 nished with numerous prominent papillæ. The glans 

 strongly defined with a free ridge (prominence), sur- 

 rounding the back and sides, but in the middle of the 

 ventral surface, forming a furrow. 3 layers of muscles, 

 annular, oblique and longitudinal. 



