Styelid Tunicate from Spitzbergen. dol 
squamosa is thick and solid, but soft, the surface is smooth, 
but scaly. It is, however, impossible to get any clear idea of 
the last-mentioned character trom the figure illustrating it 
(pl. xviii. fig. 1), The dorsal lamina is plain and the larger 
tentacles are short and stout, resembling the corresponding 
organs of Ypstlocarpa clipeata. 
The two species differ as to the branchial sac. In Styela 
squamosa two distinct folds lie on each side; the others are 
in a rudimentary state. YY. e/¢peata has three well-developed 
folds on each side, the second is rudimentary. 
The apertures are differently placed. In S. squamosa they 
are distant, the branchial is placed at the ventral end and the 
atrial at the dorsal end of the anterior extremity. In Y. edi- 
peata they are close together and placed on the dorsal surface 
of the body. 
Herdman gives no description of the reproductive organs 
of S, squamosa, nor, so far as I know, has this gap been 
subsequently filled. ‘The description is thus too incomplete 
to allow of satisfactory comparison, and consequently one 
cannot for the present draw any conclusions’ as to the rela- 
tiouships or systematic position of Styela squamosa, since the 
divisions are for the most part based on differences in the 
reproductive organs. 
In his paper on “The Classification of the Styelide,” 
A. G. Huntsman (1913, Zool. Anzeiger, xli. pp. 482-501) 
has divided the genus Styela into two groups: one comprises 
Styelu, Katatropa, Goniocarpa, Botryorchis ; the other 
Cuemidocarpa alone. Cnemidocarpa is rightly distinguished 
from Styela, owing to the different relation of the male and 
female organs to each other. In Séyela the ovary is elon- 
gated and bordered along either side by the male glands, 
One or two ovaries are present on each side of the body. In 
Cnemidocarpa the male glands are situated between the 
body-wall and the ovary, and form, together with the latter, 
one structure. The gonads vary from few to many, are 
elongated, and placed in a single row on each side. 
In discussing the systematic position of Ypsilocarpa, the 
characters of the gonads, the atrial tentacles, the branchial 
sac, the alimentary canal, the dorsal tubercle, and, though 
secondarily, the condition of the test should be considered. 
Hach of these organs exhibits characters peculiar to the 
species. 
So far as one can judge from this single individual, the 
species should be referred to the Cnemidvcarpa group, and 
not to the Styela group, owing to the relation of the testis to 
