mollem aabiiingerne er ca. 3 mm. Ingestionsaahningen sid- 

 der øverst, egestionsaabningen noget længer nede. 



Kappen er klar og gjenuemsigtig, med kar ligelig for- 

 delt over det hele. Enkelte steder, især omkring aabnin- 

 e;erne lindes stumpe foi-høininger. Muskulaturen er næsten 

 bare udbredt paa hoire side. 



Ingeitionsaabningen har 8 lapper og er oragivet af 

 en krans af lange, trekantede tentakler. Egestionsaabningen 

 har 6 lapper. 



Flimmerftømmen dannes af en dobbelt membran og 

 flimnierorganet er en tragtformig grube, noget bredere 

 end høi. 



GjæUesække)is rygfoJd er en tungefoi-met membran. 

 Paa siderne er der ingen folder; men der findes rudimen- 

 tære papiller, ligesom den øverste ende af længderibberne 

 bøies ind i gjællesækken som papiller. 



Hele tarmkanalen ligger paa venstre side i nær for- 

 bindelse med generationsorganerne. Nyrekonkrementer fin- 

 des baade i tarmvæggen og i muskellaget. Anns har to 

 tilbagebøiede læber. 



Den blev fundet 29de juni 1878. ved 71.42» n. Br., 

 37.1" 0. L. og paa et dyb af271 m. Temperatur — 1.43 C. 



Cynthia pyriformis, Rathke. 

 (Se Kiær. ang. beskrivelse og synonymi). 

 Fundet ved Røst. 



Styela rustica?, Linné. 

 (Pl. III, fig. -'). 



(Om synonymi, se Kiær). 

 Kroppen er ca. 7 cm. høi, cylinderformet, dog noget 

 smalere nederst end paa midten. x\abningerne sidder begge 

 paa oversiden paa siphoner; mundsiphoueu er længst og 

 rettet forover. 



Kappen er lys brun, læderagtig og rynket, især nedentil. 



Begge aahninger er 4-lai)pede; ing.aabningen omgivet 

 af mange, ugrenede tentakler af foi-skjellig længde. 



Gjælleswkken har 4 folder paa hver side. 



Maren er stor og stribet udvendig. Anus har to 

 læber, ulige lange og begge lappede. 



Et ugrenet orariiini paa høire side. 



Da der kun fandtes et exemplar af denne art, og 

 dette var daarlig konserveret, kan jeg intet dømme om 

 gjællesækkens finere struktur, og maa derfor lade arten staa 



between the orifices is about 3 millim. ; tlie l)ranchial being 

 the uppermost. 



Tlie tunic is clear and transparent, with vessels 

 distributed equally over the whole. In a few places, espe- 

 cially round tiie apertures, there are blunt prominences. 

 The musculature extends almost exclusivi-ly over the right 

 side. 



The braiichial orifice is 8-lobed, and is surrounded by 

 a fringe of long trianguhir tentacles. The atrial orifice 

 is 6-lobed. 



The peripJiaryngeal band is fornied by a double mem- 

 ])rane. and the dorsal tubercle is a funnel-shaped pit, somc- 

 what broadcr than it is deep, 



The dorsal lamina of the brunchinl sac is a tongue- 

 shaped membrane. There are no folds on the sides, but 

 there are rudiraentary papillæ, and the upper ends of the 

 longitudinal bars are bent into the branchial sac as pa- 

 pillæ. 



The whole of tiic inirsfinal fidir lies on the left side, 

 closely connected with the genei-ative organs. Kidney 

 concretions are found l)oth in the intestinal wall and in 

 the muscular stratum. Tlie anus has two backward-curv- 

 ing lips. 



This specimen was found on June 29th, 1878, in 

 71.42" N. Lat. and 37.1" E. Long. at a depth of 271 metres, 

 with a tempera ture of — 1.43" C. 



Cynthia pyriformis, Rathke. 

 (For description and synonyms, ride Kiær). 

 Found near Røst. 



Styela rustica V, Linnæus. 



(Pl. III, fig. .-.). 

 (For synonyms, ride Kiær). 



The Ijody is about 7 centim. high. cylindrical in 

 shape, though somewhat n.irrower at the base than in tlic 

 middle. Both the apertures are situated on the npper side 

 on siphons, the oral siplion being the longer of the two, 

 and directed forwards. 



The tunic is of a light lirown colour. coriaceous and 

 wrinklcd, especially near the base. 



Botii tlie apertures are 4-lol)ed. and the branchial is 

 surrounded by a numlier of simple tentacles of various 

 lengths. 



The lirancJuaJ sac has 4 folds on each side. 



The stomacli is large, and corrugated exteriorly. The 

 anus bas 2 lips of uiipqual length, both lobed. 



There is a simple orary on the right side. 



As there was only onc specimen of this species, and 

 that was badly preserved, I am unable to judge of the 

 finer structure of the branchial sac, and must therefore 



