82 
Recently Mrs. Traustedt presented to the Zoological Museum 
of Copenhagen the M. S. notes and drawings left by her late hus¬ 
band. Among the drawings were found two relating to Molgula 
liitkeniana, showing the structure of the branchial sac'and of the 
dorsal lamina. I have then thought it my duty to take this op- 
portunity of supplying the lacking detailed description of this spec¬ 
ies, the type of which is preserved in the collection of the Copen¬ 
hagen Museum, honouring also thereby the memory of the late 
excellent Danish Ascidiologist. 
Two specimens of this species are found in the Copenhagen 
collections, both of them dredged by Liitken in Middelfart Sound 
(Little Belt) in 1861. - Both specimens are 
in a bad condition. Strangely enough no more 
specimens have come to hånd, although zoo¬ 
logical investigations have often been made 
\ 
in that place, which is, evidently, a great 
place for Molgulids, the species M. citrina, 
tubifera and occulta being likewise known 
from there. 
To the characters given by Traustedt 
— from which it is easily seen that the 
species belongs to the manhattensis -group 
of Hartmeyer — I can add the following from the examination 
of the type. The intestinal loop is, as usually in this group, 
strongly bent, the two branches lying close to each other, except- 
ing at the bending point. The renal sac is short, broad and only 
slightly curved, its upper edge being nearly straight. It is placed 
close beneath the gonad. The folds of the branchial sac have each 
three internal longitudinal vessels. 
To the two original drawings by Traustedt I have added a 
sketch of the better of the two specimens, which I may then de- 
signate as the type specimen. It is 8 mm long; the other spec- 
imen is slightly larger. 
Fig. 3. Molgula liitkeniana 
Trstdt. Type specimen. 
23-9-1920. 
