24 



Bi';inchi:ilsækken med 10—12 iwkker stigmata. Form- 

 len alniindelig: d. 8 — 5 — o — 8 r. 



Var. p. inradiatus adskiller sig fra typeformen blot 

 ved sin fuldstændige mangel af lyse. radiære baand og ved 

 (len fælles tunicas storre gjennemsigtighed. 



Var. p. rufuB liar fonulen de 4 ovennævnte tentakler 

 endmi 4 yderst smaa saadanne alternerende med de først- 

 nævnte, men er i sin anatomi forresten aldeles lig type- 

 formen. Individernes farve er rødbrnn. Den fælles tunica 

 i levende live transparent. Stoloiuulvidelserne gulhvide. 



Typeformen og var. p. inradiatus forekom l)egge meget 

 abnindebg ved Espevær og Bømmeløen (juli maaned), hvor 

 den var den hyppigste synascidie at paatræffe, varieteten 

 sjeldnere end typeformen. Begge former fandtes i en dylide 

 af 3 — 6 favne paa samme lokaliteter, undertiden sammen- 

 voxede til en klump uden at det var mig muligt at paavise 

 overgange melleni dem trods undersogelsen af over 100 

 cormi af begge former tilsammen. Typeformen ligner meget 

 i farvetegning hofri/Ilus morio, Giard og h. anrolineatus, 

 Giard. Varieteten p. rufas vai- ikke sjælden ved Andenæs 

 (juli). 



Tile branchial sac lias from 10 to 12 rows of stig- 

 mata: formula usually d. 8 — 5 — 5 — 8 v. 



Var. P. inradiatus is only distinguished from the 

 type form by the total absence of light radiating bands, 

 and by the greater transparency of the common tunic. 



Var. P. rufus. besides the above-mentioned 4 teiitacles, 

 has 4 extremely small ones alternating with the fonner, 

 but otherwise in its anatomy, is exactly like the type-form. 

 'IMie colour of thr members is a reddish brown, and the 

 common tuuic, during life, is transparent. The stolonial 

 dilatations are of a yellowish white colour. 



The type-form and var. P. inradiatus both occurred 

 very generally in July at Espevær and Bømmeløen, where 

 tliey were the most frequently met with of any of the Syn- 

 ascidiæ, the type-form more frequently than the variety. 

 Both forms were found at a depth of from 3 to 6 fathoms, 

 in the same localities, sonietimes grown together into a 

 lump without its being possible for me to see where one 

 left oS' and tlie otlier began, notwithstanding the exami- 

 natiou of more than 100 cormi of both forms together. Tn 

 colour, the type-form very closely resembles Rotryllns mo- 

 rio, Giard, and B. aurolineafus, Giard. The variety P. 

 rufus was not uncommon at Andenæs, in July. 



Botrylloides, -Milue- Edwards, 1846. 

 Botrylloides parvulum, n. sp. 



(Tab. II. fig. 2i>— :!Ii. 



Kun en liden corinus blev funden. Længden 12""", 

 Ijreddeu 10'"'" og tykkelsen 2""". Farven er mørk violet med 

 smaa kridhvide flækker, der fremkommer derved, at stolon- 

 udvidelsernes tykke ende er hvidpigmenteret. Den øvrige 

 del af stolonerne vai- violetfarvet. Individerne var ligeledes 

 violette med en del af oversiden hvid])igmeuteret. 



Den fælles tunica er meget fast og næsten opak. 



Individerne sad meget tæt ved hinanden uden at der 

 paa den lille cormus lod sig iagttage noget tydeligt system. 



Individernes længde ikke over 1""". 



Tentaklernes antal lod sig paa grund af individernes 

 stærke pigmentation ikke bestemme. Knu saaes tydelig 2 

 større laterale. 



Branchialsækken med 11 — 12 rækker stigmata. Form- 

 len d. 4—2—2—4 v. 



Stolonudvidelserne er relativt store. 



Æg og larver er poraerantsgule af farve og af usæd- 

 vanlig størrelse. 



Ovennævnte cormus fandt jeg i en dybde af 4 favne 

 Ted Espevær fastheftet til en laminariestilk. 



Botrylloides, MiliK'-E(l\v;ir(l.s, l S4G. 

 Botrylloides parvulum, n. sp. 



(P). II, tigs. I'!!— Hl). 



Only one small cormus found, length 12""", l)readth 

 10""» aud thickness 2'"'". The colour is dark purple with 

 small chalky white spots occasioned by the white pigmen- 

 tation of the thick ends of the stolon dilatations. The rest 

 of the stolens is purple. The members are also purple 

 with part of the upper side white. 



The common tunic is very firm and almost opaque. 



The mem1)ers are placed very close to one another, 

 and no distinct systems can be observed. 



The length of the members is not more than 1™"". 



On account of the rich pigmentation of the members, 

 the number of the tentacles could not be determined. Only 

 2 large lateral ones were clearly seen. 



The brancliial sac has 11 or 12 rows of stigmata: 

 formula, f/. 4 — 2 — 2 — 4 r. 



The stolon dilatations are relatively large. 



The ova and larvæ are of an orange yellow colour, 

 and unusually large. 



I found the aliove cormus at Espevær, attached to a 

 Laminaria stem, at a depth of 4 fathoms. 



