Faiii. IL Cyiitliiidæ, Lac. luit 



Pelonaia, Forli. & Goods. 



17. Pelonaia corrugata, Forhes. 



Jacobsolin, Tunicaten des weissen Meeres. 



Transtedt, Ascidiæ siniplices, ..H^^ich", V. 



Udbredelse: Sjælden, men langs liele kysten fra Chri- 



stianiatjorden til Vadsø, 40 — 20U m., sand og lere. 



Faiii. IL Cyutlliidæ, Lac. Dut. 



Styela, Macleay. 



18. styela Loveni, M. Sårs. 

 (= C. nistica, Kupffer og St. ar/gregata, Traust.). 

 Styela aggregata, Traustedt. Ascidiæ simplices, „Hauch", V. 

 Om denne arts synonymi se „Oversigt", pag. 48. 

 Udbredelse: Almindelig langs hele kysten, iallefald 

 til Hammerfest, ca. 50 — 400 m. 



19. Styela rustica. Lin. 

 Styela inonoceros, Herdman, Notise on British Tunicate, 



II, pag. 450, Pl. XXXVI. tig. 2. 

 Polycarpa rustica, Jacobsohn, Tunicaten des weissen 



Meeres. 

 — Traustedt, Ascidiæ simplices, ..HaucJi", V. 



Jeg gjorde i mit forrige arbeide opmærksom i)aa, at 

 St. rustica ikke som at Herdman (Revised Glassif. of Tuni- 

 cata, pag. 585) kunde stilles under Polycarpa. I sine 

 „Xotes on British Tunicata" II (pag. 448) oplyser han, at 

 den af ham som rustica anseede form antagelig var en • 

 Polyc. glomerata, Aid., iethvertfald gnnske forskjellig fra 

 den arktiske Styela, han i 1891 fandt ved Xordkap og som 

 han nu lietragter som Linne's rustica. Herdman's rustica 

 er lig min aggregata, medens hans sammesteds beskrevne 

 moituceros, Miill. efter min mening er en varietet af den 

 form, Kupffer liar beskrevet som aggregata og Traustedt 

 som rustica. Traustedts opfatning synes mig rimeligst, 

 hvilket jeg under næste art vil soge at bevise. Med hensyn 

 til var. monoceros. Moll. har jeg seet „hornet" paa alle 

 stadier fra en skarp tornet spids til en but forhøining eller 

 kun eii knude, varierende til form og størrelse. Ligesaa 

 almindeliji forekommer en form, som mangler ..horn-, men 

 hvis anatomi aldeles stemmer overens med var. munoccros. 

 En god aflnldning af kjonsorganerne tindes i Wagners 

 „Wirbellosen d. weissen Meeres-' (I, Tab. 15, fig. 10—11). 



Udbredelse: Almindelig langs hele vor kyst paa for- 

 skjelligartet Imnd til ca. 80 ni. 



Pelonaia, Fovb. & Goods. 



17. Pelonaia corrugata, Forbes. 



Jacobsohn, Tunicaten des weissen Meeres. 



Traustedt, Ascidiæ simplices, ..Hauch", V. 



Distribution. Rare, but along the whole coast from 



the Ciiristiania Fjord to Vadsø. Depth, 40—200 m., on 



sand and clav. 



Styela, Macleay. 



18. Styela Loveni, M. Sårs. 

 (= C. rustica, Kupffer, and St. aggregata, Traust.). 

 Styela aggregata, Traustedt, Ascidiæ simpHces, „Hauch", V. 

 For the synonyma of this species, see „Oversigt-', p 48. 

 Distril)ution. General along the whole Norwegian 

 coast, at least as far as Hammerfest. Depth. from about 

 50 to 41 Htm. 



19. Styeia rustica, Lin. 



Styela monoceros, Herdman, Xotes on British Tunicate, 

 p. 450, Pl. XXXVI, fig. 2. 



Polycarpa rustica, Jacobsoim. Tunicaten des weissen 

 Meeres. 



— Traustedt. Ascidia' simplices, ..Hauch"', V. 



ln my former work, I drew attention to the fact that 

 St. rustira could not be placed, as Herdman places it (Re- 

 vised Glassif. of Tunicata, p. 585). under Polycarpa. That 

 author. in his „Xotes on British Tunicata", II. p. 448, 

 states that the form wliicb he considered to be rustica, 

 was probably a Polyc. gloii/entta, Aid. and at any rate 

 quite different from the arctic Styela, whicli he found in 

 1891 at the North Cape, and wiiich he now considers to 

 be Linnæus' rtistica. Herdman's rustica resembles my aggre- 

 gata, while his monoceros, ^loll. described in the same work 

 is, in my opinion, a variety of the form described by 

 Kupffer as aggregata, and by Traustedt as rustica. Trau- 

 stedfs view seems to me reasonable, as I will endeavour 

 to prove in my remarks on the next species. As regards 

 var. monoceros, Mrdl. I have seen the ..liorn" in all stages, 

 from a sharp, thorny point, to a blunt elevation or only 

 a protuberauce varying as to shape and size. One form, 

 in which the „horn" is absent, but whose anatoray is ex- 

 actly similar to var. monoceros. is equally connnon. A 

 good rei)resentation of the sexual organs will l)e found in 

 Wagner's Wirbellosen d. weissen Meeres • (I, Pl. 15. figs. 

 10, 'il). 



Distrilnition. General along the whole Norwegian 

 coast on various bottoms, to a depth of about 8()m. 



