34 
known. Until full certainty can be obtained as to their identity with 
such species, I think it preferable to keep them as separate spec¬ 
ies instead of simply uniting them with forms to which they show 
near relation. In this way confusion is less liable to be the result 
than if they are simply united with those species without sufficient 
guarantee for the correctness of the identifications. 
I am especially indebted to Prof. Michaelsen and Prof. H art¬ 
meyer for sending me material for comparison and for giving me 
several informations in letters. I beg to express to both of them 
my sincere thanks. 
Fam. Molgulidae. 
Molgula Forb. 
Molgula amokurae n. sp. 
(Textfigure 1.) 
Locality: Port Ross. ca. 10 Fathoms. 
Of this evidently new form three specimens are at my dis- 
posal. They are loosely attached to some Algae. The largest spec- 
imen measures 8 mm, the smallest 4 mm. The shape is globular 
and the siphons are externally only slightly prominent, which may 
be due to the State of preservation. 
The test is, when its fine covering of sand has been removed, 
rather pellucid and thin. The body-wall has very feeble muscles. 
It is a noteworthy feature that the blood-vessels form a brown 
network in the body-wall. The same has been observed in other 
Molgulids, e. g. Ctenicella natalensis (Michaelsen 1918, p. 4). 
The inner siphons are moderately developed and placed at a short 
distance from each other. 
The branchial sac has on each side seven low folds, the 
first of which (near the endostyle) has three internal longitudinal 
vessels. The next four have four each, and the last two have five, 
as far as I have been able to count. 
Transversal vessels of lst and 2nd order and parastigmatic 
vessels are found. The stigmata are rather long and only little 
curved. In the space between the endostyle and the first fold some 
spirals may be seen. 
