246 
perfect. Pennens diffuse (rather) well developed. Reproductive 
organs present from the mesenteries of the first cycle. Nemato- 
cysts of acontia (at least) of two kinds, the larger nematocysts of 
ordinary or more than ordinary size. 
As it seems to me necessary to subdivide the genus Sagartia 
I here propose to re-erect the genus Thoe for such Sagartia-species 
having a smooth column without suckers and cuticle, and provided 
with ordinary or more than ordinarily large nematocysts in the acontia. 
I have namely, among others, examined Sagartia troglodytes, viduata, 
luciae and sphyrodeta and found that the three latter species, to my 
mind belonging to the genus Thoe, are so different from the first 
species that they must be referred to a separate genus. Meanwhile 
the diagnosis here given of the genus Thoe is only tentative as we 
must expect an examination of more species before a good diag¬ 
nosis can be established. In this connection I will mention that the 
real Thoe (Sagartia) viduata (O. F. Miill.) is very probably not identical 
with the species viduata from the coast of Great Britain and from 
the Mediterranean. 
Thoe vagrans (Stuck.). 
Sagartia vagrans n. sp. Stuckey 1909 c p. 384, PI. 17 fig. 2. 
Diagnosis. Column cylindrical. Cinelides in the middle third 
of the column. Margin distinet, in larger specimens somewhat un¬ 
dulated. Sphineter strong, broad, proximally by degrees diminishing, 
mostly reticular. Tentacles numerous, up to 192, in contracted State 
rather short, the inner considerably longer than the outer. Some¬ 
what more than half the oral disc provided with tentacles. Siphono- 
glypheswell developed with aboral prolongations. Pairs of mesenteries 
to about 96, hexamerously arranged. Mesenteries of the 1 3 (and 
a part of the fourth) cycles perfect. Longitudinal muscle pennons 
diffuse, in the middle part of the mesenteries on the three or four 
oldest cycles. Parietobasilar muscles weak. Reproductive organs only 
on the third and fourth cycles? (always?). Nematocysts of the column 
12—17 X 2—2,5 u, often somewhat curved, those of the tentacles 
partly 14—22 x I .5 //, partly 11—16 x 2—2,5 partly 16—24 
X 3 , 5—4 those of the actinopharynx partly 22—28 x about 1 , 5 ^/, 
partly 14X1 partly 17—27X3,5—4,5//, those of the acontia partly 
60— 79 x 5 — almost 7 //, partly 24—31 x about 1 //, needle-like. 
