W. Lilljeborg on the Genera Peltogaster and Liriope. 171 
2. Peltogaster sulcatus, n. sp. PI. IV. fig. 14. 
Diagn. Acetabulum pone medium situm, simplex, margine expanso, 
radiato. Infra inter acetabulum et aperturam corporis anteriorem 
magnam et marginatam bisulcatus.—Longit. circ. 7-5 mill. 
This species is much smaller than the preceding, and has a 
more cylindrical form. It generally appears to be thicker at the 
part where the organ of adhesion is situated. The two extrem- 
ties of the body are curved downwards, though not much. The 
part behind the organ of adhesion is shorter and more slender 
than the anterior part. There are some transverse folds in the 
vicinity of the organ of adhesion, and between this organ and 
the anterior aperture there are two longitudinal parallel furrows. 
Sometimes there are in this part several longitudinal folds in 
the skin, which is rather thick and scarcely transparent. 
The organ of adhesion is well developed, though much smaller 
than that of the preceding species. The neck is very distinct, 
and the margins are turned outwards and present radiating 
furrows. In the middle there is an elevation, in which a small 
orifice (the mouth) is visible, surrounded by a brown horny 
ring. ‘The rest, although apparently of more solid consistence 
than the skin, is of the same colour; there is no shield at its 
base, which is surrounded by a harder raised border of epidermis, 
and beyond this there is in the epidermis a streak of a more solid 
and more opake substance. 
The anterior part of the body presents a short tube, curved 
downwards and provided with longitudinal folds ; this surrounds 
the large aperture of that part. Above this aperture the author 
has found a small empty space between the skin and the sac of 
eggs which fills the body. Specimens preserved in spirits are of 
a yellowish-white colour. 
This species has been found upon Pagurus cuanensis and P. 
chiracanthus, on the coasts of Norway. Dr. G. Lindstrém met 
with as many as seven upon the same individual of P. cuanensis. 
The anterior part of the body is usually directed a little to the 
right above the abdomen of the Pagurus. 
3. Peltogaster microstoma, nu. sp. PI. IV. fig. 15. 
Diagn. Acetabulum pone medium situm, minimum, margine vix 
expanso et radiato. Apertura anterior minima, vix visibilis, neque 
marginata.—Long. 5-6 mill. 
This species is smaller than the preceding, and is distinguished 
from both the others by the smallness of the organ of adhesion 
and of the anterior aperture. Its form is very variable: it is 
sometimes cylindrical (fig. 15), sometimes much flattened, pro- 
bably owing to the varying pressure of the surrounding shell. 
12* 
