189 
taken in connection with the stouter cirri, to warrant the retention 
of the name maxima for the latter. Å critical comparison of the 
proportions of the proximal pinnules would be interesting, but, as 
this involves a certain amount of risk to the specimens, I håve 
not thought it advisable to attempt any investigations along these 
lines until material is more abundant than it is now. 
My apologies are due to Professor E. von Mårenzeller for 
omitting to mention, when I first treated of the form, that he was 
the first to record Heliometra glacialis from eastern Asia. 
Heliometra glacialis var. biarticulata (A. H. Clark). 
Heliometra glacialis var. biarticulata 1908. A. H. Clark, Proc. Biol. 
Soc. Washington, Vol. 
Å "specimen of NE glacialis in the United" States 
National Museum collection which was purchased at Shanghai differs 
in several ways both from the typical form of the species, and 
from var. maxima of the Seas of Japan and Okhotsk. The example 
lacks the pinnules, cirri, and most of the arms, and I therefore 
did not consider myself justified in suggesting a new form with 
it as a basis, more particularly as its true habitat was more or 
less uncertain. In the present collection, however, is a similar 
sSpecimen in excellent condition, though. unfortunately there appears 
to be some doubt in regard to the correctness of the locality, 
Straits of Tsugaru, given on the label. | 
In this new form, which I have called biarticulata, the Se Gl 
jøints of the lower pinnules are more strongly carinate than in 
the type form, the cirri are more prominently spiny, and the distal 
intersyzygial interval is three instead of four oblique museular 
articulations, there thus being two instead of three single brachials 
between tbe syzygial pairs. 
The longest. cirri are about 50 mm. long with 60—70 joints, 
the arms somewhat over 150 mm. in length. 
P, is 27 mm. long. with sixty short joints, its distal half 
rather prominently -serrate; P, is similar, and of the same length; 
Pz-is 25 mm, long, all the joints proportionately slightly longer, 
