10 



1883. Didoma cri/staUiiiuiii, Drasche. Die Syiiasc. dur 



Buclit von Rovigno. 



1890. — — Lahilk'. Recherches sur les tuni- 



ciers des cotes de France, p. 151. 



At ideiitificere Sars's originalexemplarer af distomum 

 vitreum fra universitetssamliiigen med d. crystaUinum, Ren. 

 lod sig med det foreliggende materiale ikke med fuld sik- 

 kerlied gjøre paa grund af dettes mindre gode conservering. 

 hvorved f. ex. individernes lirancliialsæk var bleven saa 

 sterkt contraheret, at ikke ot eneste stigma lod sig iagt- 

 tage. De øvrige anatomiske karakterer tj'der dog paa, at 

 denne antagelse er rigtig. Drasche liolder ogsaa disse for 

 synonymer („Die Synascidien der kiuclit von Rovigno"). 



Som supplement til Sars"s beskrivelse kan foies: 



Cormus lioide onitr. 3 cm., bredde indtil 2 cm. 



Den fælies tunica incrnsterer overalt smaa sandpar- 

 tikler dog mest ved koloniens basis. 



Denne art er lunden i en dybde af 2U - 60 favne 

 foruden paa de af Sårs anforte lokaliteter ogsaa i Øxfjord, 

 Manger, ved Hitteren og Aalesund. 



Distaplia, l>ella Valle, 1880. 

 Distaplia clavata, Sårs. 1851. 



i, Tall. 1, fig. :i). 



1851. Lejitoclinum davatum, Sårs. Nyt INIag. for Xat. 



Bd. VI. 



Prof. Sårs henfører denne art til slægten Ifjifoelininn, 

 idet han dog bemerker, at den ved sin „form afviger fra 

 de andre bekjendte arter af denne slægt, hvilke alle danne 

 overtræk paa andre legemer"'. Han er den første der har 

 beskrevet uogen distaplia-art som synascidie. 



Hans beskrivelse skal jeg supjjlere efter undersøgelsen 

 af originalexemplarerne, der dog ikke tillod nogen særdeles 

 indgaaende examin.ation paa grund af materialets mindre 

 gode conservering, 



Cormus (det største exemplar) 6 cm. lang, med en 

 største diameter af 2.'> cm, ..Foden" er altid smalere end 

 „hovedet" ; dog er differentsen mindst hos de største exem- 

 plarer. Den udgjør omtr. koloniens halve længde. 



Systemerne talrige, grenede. ludividerne stillede i 

 dobbelte rækker som hos botrylloiderne. Ingen frelles kloak- 

 aabning ved koloniens top. 



Individernes niaximallængde 4'""', 



Branchialsækken med omtr. 25 stigmata i hver lække. 



Ventrikelen stor, assymetrisk, hos de største individer 

 mørk pigmenteret. 



Æggesækken var hos de undersogte species lidet frem- 

 trædende og uden æg. 



1883. Distuiiia cri/sfaUirnni). Drasche. Die Synasc. der' 



Bucht von Rovigno. 

 1890. — — Lahille. Recherches sur les tuni- 



ciers des cotes de France, p. 151. 



It was not possible, with tlie nu\terial at hand, to 

 identify with peifect certainty 8ars's original specimeiis of 

 Disiomuin viireiim in the University collection with Disfoma 

 rr//st(dJ/iiuiii. Renier, on account of the defective preservation 

 of the former, the braneliial sae of the merabers, for in- 

 stance, being so greatly contracted, that not a single stigma 

 could be examined. Otlier anatomical characters, however, 

 would seem to imply that this supposition was correct. 

 Drasche also holds these to be synonymous (Die Synascidien 

 der Bucht von Rovigno). 



The following particulars may be added as a supple- 

 ment to Sars's description: 



Height of the cormus about 3 cm., breadtli up to 

 2 cm. 



The common tunic is inci-usted all over with small 

 partirles of sand, particularly at the base of the colony. 



This species was found at depths of from 20 to GO 

 fathoms in Øxtjord, Manger, at Hitteren and Aalesund, 

 besides the localities stated by Sårs. 



Nat. 



Distaplia, Della Valle, 1880. 



Distaplia clavata, Sårs. 1851. 

 I Pl. I, iv/. ;;). 



1851. LvpforVnnitn davatnm. Sårs. Xyt Mag. for 



Bd^ Vi. 



Prof. Sårs refers this species to the genu.s Leptodi- 

 uinii. remarking, however, that ..in form. it differs from the 

 otiier known species of this genus, which all form an in- 

 vestment on other bodies". He was the first to describe 

 any species of Distaplia as Synascidia. 



I shall supplement his description from the results 

 of an examination of tiie original specimens. which did not, 

 however, permit of any very niinute examiinition, by reason 

 of their somewhat imperfectly preserved condition. 



The cormus (the largest specimen) is 6 cm. long, 

 with a maximum diameter of 2..'i cm. Tiie ,.foot" is always 

 narrower than the „head", although the difference is less 

 in the largest specimens; it constitutes about half the length 

 of the colony. 



The systems are numerons and ramitied, the meml)prs 

 being placed in double rows as in Botrylloidæ. Tliei^e is 

 no common cloacal aperture at the top of the colony. 



The maximum length of the members is ■i""". 



The branchial sac has about 25 stigmata in each row. 



The ventiicle is large, asymmetrical and, in the largest 

 members, darkly piginented. 



The ovisac in the specimens examined was inconspic- 

 uous and without ova. 



