Eg:estioiistial)niiia:eii er Ibrsynet med vn lang ved basis 

 bred. fra midten af phidselig afsmalnende tunge, der ofte 

 viser en pilformig dannelse med mere eller mindre tydelig 

 frenitrædende tværrynker. 



Branchialsækken har 7— R nekker stigmata, indtil 24 

 i hver række. De forholdsvis smale stigmata aftager i 

 længde mod ingestionsaaiiningen. Ligeledes er de 2 — 4 

 nærmest endostylen liggende stigmata aftagende i længde 

 mod denne, det sidste ialniindelighed cirkeliiindt. 



Dorsallamina onitr. af stigmas længde. 



Ventrikelen med mange storre og mindre, uregelmæs- 

 sige, longitudinelt udti-ukne forboininger: ,.pseudoareole-'. 

 Ventrikelens dannelse viser stor variation selv inden samme 

 cormus. Snart bestaar den bovedsagelig af folder, der ind- 

 tager hele ventrikelens længde, snart udelukkende af kurte 

 smaa forhøininger, ligesoni alle overgange forekommer. 



E-ectum er vid og afsluttes lidt ovenfor branchialsæk- 

 kens midte. 



Postabdomen er noget kortere end den ovrige del af 

 legemet og indkneben mod midten. 1 de undersøgte cormi 

 forekom kun i dennes øverste del enkelte smaa æg. 



De faatallige fælles kloakaabninger ender i 2""" lange, 

 cylinderforraige tuber. 



Af de 3 fundne cormi var de 2 foisynede med lange 

 postabdominale udloliere. udgaaende fra koloniens basis og 

 følgende de laminarieblades ujevnheder. hvortil denne var 

 fæstet. De fleste af disse udløbere viste tidlige stadier af 

 postabdominal knopdannelse. 



Denne nye art fandt jeg i juli maaned ved Espevær 

 i blot o cormi. hvoraf den største svarede til de ovenfor 

 anførte maal. Farven var skuffende lig amaroucinm proli- 

 feri(m's, der forekom almindelig paa samme lokalitet. 



I universitetets samling findes exemplarer fra Herlø- 

 vær, Manger (M. Sårs), bestemte som aiiimvuriuni riiJii- 

 cunchim, Frey & Leuek. 



Parascidium crispitin adskilles fra de 3 ved de franske 

 kyster forekommende arter let ved sit ringe antal stignia- 

 rækker i ])ranchialsækken: nemlig blot 7—8; herved danner 

 den en naturlig overgang til den nærstaaende genus rirci- 

 nalium, der netop hai" dette antal. Fra alle tidligeie 

 kjendte parascidier afviger den ligeledes ved sin mere eller 

 mindre tydelige o-deling af ingestionsaalniingens tænder. 



Synoicum, Phipps, 1774. 



Syn. Sidiu/tnii, Herdnian (ikke Savigny). 



MorcheJliiDii. Herdman (ikke Lahille). 



Synoicum incrustatum. Sårs, 1851. 



(Tab. ir, tig-. -J;'.— 'iå). 

 1851. AmaroiAcium ■iiiniistatum, Sårs. Nyt Mag. for Nat. 



Bd. VI. 



The atrial orifiee is furnished with a Ioulj tongue. 

 broad at the base. and aliruptly tapering from the middle; 

 it often exhibits a sagittal formation, and more or less 

 distinctly prominent transverse folds. 



The branchial sac has 7 or 8 rows of stigmata with 

 as many as 24 stigmata in each row. These are compara- 

 tively narrow, and decrease in length towards the bran- 

 chial aperture. The 3 or 4 nearest to the endostyle also 

 decrease in length as they a])i)roach it. the last being 

 generally circular. 



The dorsal lamina is about the length of a stigma. 



The ventricle has numerous irregular, longitudinally 

 elongated prominences of varions sizes. the ..pseudo-areolæ". 

 The formation of the ventricle exhil)its great variations, 

 even in the same cornins. Sometimes it consists principally 

 of folds occupying its wbole length. sometimes exclusively 

 of small prominences such as occur in all transitions. 



The rectum is wide, and cnds a little aliove the middle 

 of the branchial sac. 



The post-abdomen is rather shorter than the rest of 

 the body. and constricted towards the middle. Small ova 

 were fimnd only in its upper part in the cormi examined. 



Tile few common cloacal apertures end in cyliiulrical 

 tubes 2""" in length. 



Two of the three cormi fouiul wert' furnished with 

 long post-abdoininal stolons starting from the base of the 

 colony and following the unevennesses of the Laininaria 

 ieaf to wliich the colony was attached. Most of these 

 off-shoots iihowed eai4y stages of post-abdominal gemination. 



I found only 3 cormi of tliis new species at Espevær 

 in Julv. The largest of the three corresponded with the 

 above-given measureiuents. The colour was strikingly like 

 that of Amarourium pyolifcrum, which generally occurred 

 in the same locality. 



ln the University collection there are speciinens from 

 Herlovær. Manger (M. Sårs), labelled AiiKiroKr/uDi rvhi- 

 cKiiditni, Frey and Leuck. 



Parascidmm crispum is easily distinguisiied from the 

 3 species occurring on the French coasts, by the small 

 number of rows of stigmata in the branchial sac, viz. only 

 7 or 8. It thus forms a natural transition to the nearly- 

 allied genus, Circinalium, whicii has precisely this number. 

 It also differs from all previously known Parascidia by the 

 more or less distinet triple division of the denticles of the 

 branchial oritice. 



Synoicum, Phipps, 1774. 



Syn. Sklnyiim. Herdnian fnot Savigny). 



Slordidliinu, Herdman (not Lahille). 



Synoicum incrustatum, Sårs, 1851. 



(Pl. II, figs. :i:3— 2.^). 



1851. Amaroiirhim rncnij-tatuni, Sårs. Nyt Mag. for Nat. 



Bd. VI. 



