37 
Fig. 2. Halocynthia 
carnleyensis n. sp. 
Diagrammatic sec- 
tion of a specimen 
with lest basally 
tliickened. 
The dorsal tubercle is horseshoe-shaped with the aper- 
ture directed forwards. In some specimens both horns are turned 
inwards, in others outwards, and finally in one case one horn 
was turned outwards and the other inwards. 
Lamina dorsalis has its origin some dis¬ 
tance from the dorsal tubercle and consists of ca. 
35 siender languets. 
The branchial-sac has seven folds, the first 
of which has ca. 6 internal longitudinal vessels, 
while the following folds are much stronger and 
may have up to 22 vessels. 
A rudimentary fold is often found be- 
tween the endostyle and the first perfect fold, but 
only developed in the lower part of the gill-sac 
(near the mouth). The number of intermediate 
longitudinal vessels is 3—4 in each interspace. 
In one specimen the formula for the left side of 
the gill-sac is: 
E. 4 (6) 3 (10) 4 (13) 4 (18) 4 (20) 3 (12) 3 (17) 3 D. 
The intermediate longitudinal vessels between the dorsal lamina 
and the 7th fold are thick and prominent. Round the mouth the 
folds are furnished with some siender prolongations, much alike 
the „dorsal languets“. This peculiarity is, however, known to occur 
in several species of this genus. Irregularly developed transversal 
vessels, as well as parastigmatic vessels are present. 5—6 short 
stigmata are found in each mesh. 
The alimentary canal forms a wide loop, the stomach is 
rather indistinct, the hepatic giand is well developed. Anus has a 
plain margin. 
Each genital organ consists of 20—25 well separated herm- 
aphroditic lobes, the genital apertures, two on each side (J' and 
$) are found near the atrial aperture. No spicules or spinules 
are found. 
This species cannot — as far as I can see — be identified 
with any of the described species, and I shall consider it new to 
science. 
