68 
albida and Ophiothrix fragilis ; he describes it under the name 
of Cercaria capriciosa). — (I may mention in this connection that 
I have found a Trematod occurring quite usually in the gonads 
of the sea-urchin Mespilia globulus at Misaki, Japan). 
It is worth pointing out that the occurrence of this parasite in 
Oph. albida appears. to be rather local. I have opened many spec- 
imens of this species from different localities in the Danish Seas, 
but never observed the parasite in it. Doubtless this has a direct 
relation to the distribution of the host of the mature Trematod, so 
that the young stage of the Trematod will probably be found to occur 
in the Ophiurid only in such places where the Anarrhichas occurs. 
In a few specimens of the same Ophiurid from off Skagen I 
have found a pair of Nematods lying in the body cavity. They are 
young and unidentifiable; they will doubtless prove to belong to 
a species living in some fish that feeds on this Ophiurid. 
11. Henricia sanguinolenta (O. F. Muller). 
In Muller & Troschel’s „System der Asteriden“, p. 127, is 
mentioned a starfish from Bohuslån, preserved in the Museum of 
Stockholm, „von dem wir es zweifelhaft lassen mussen, ob es zum 
Genus Solaster oder Chætaster gehort“. During a visit to Stock¬ 
holm in the fail of 1919 Prof. Th. Odhner called my attention to 
this specimen, which he thought must be identical with Henricia 
sanguinolenta. I could only confirm his view; it is really only a 
large specimen of this species, as would also have to be expected 
on account of the locality from which the specimen came. 
On examining some living specimens I noticed that the small 
spine placed in the ambulacral furrow, below the ambulacral spines, 
is tipped with a skincap considerably larger than the spine itself, 
so that it is seen protrude between the tubefeet. Most probably 
some sensory function is attached to it. 
12. Echinocyamus pusillus (O. F. Muller). 
H. L. Clark in his Memoir on the Clypeastridæ *) has changed 
this commonly used name into Echinocyamus minutus , maintaining 
*) Hawaiian and other Pacific Echini. The Clypeastridæ, Arachnoididæ, La- 
ganidæ, Fibulariidæ and Scutellidæ. Mem. Mus. Comp. Zool. Vol. XLVI. 
1914. p. 61. 
