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new Species of the Genus Solenopus. 
vesicle was filled with a cream-like fluid, in which spermato- 
zoids swarmed. In the hermaphrodite gland we have seen 
both spermatozoids and ova in different stages of development, 
but at different times. 
With regard to the nervous system, we may for the present 
confine ourselves to confirming Tullberg’s statements about it 
in essential points. Future investigations will probably carry 
us somewhat further. 
Colour. Body light rose-red, with a greyish tinge, which 
has a pearly lustre and is somewhat iridescent. Branchiae 
bright red. Foot and buccal mass red. 
When the animal is brought up from the bottom and kept 
in a glass for observation, it generally lies quite quiet and 
somewhat rolled up, like a small thick worm, showing small 
signs of life. But it may happen that it begins to move: the 
margins of the mantle are thrown apart, and the foot comes 
forth ; and then it can creep up over the surface of the vessel 
with great quickness, just like other mollusks; nay, some¬ 
times it floats at the surface of the water, the back being 
turned downwards and the crooked foot upwards. 
Habitat. Near Eivindvig (Sognefjord), at a depth of 60 
fathoms by Koren in 1846; near Manger, a few years later, 
by M. Sars, 300 fathoms; near Lofoten, by G. O. Sars; 
Moldefjord, 60 fathoms, and in Korsfjord, at 200 fathoms, 
by Koren and Danielssen, but only single examples. It 
appears to be extremely rare near the Norwegian coast. In 
Bohuslehn it is found by J. Loven and T. Tullberg; but here 
also it seems to be rare. 
2. Solenopus ajfinis, Ivor. & Dan. 
Body somewhat curved in the direction of its length, fur¬ 
nished along the back with a very high keel, 16 millirns. long, 
6 millirns. broad, 6 millirns. in height, of which the keel 
makes 2 millirns. Mantle beset all over with calcareous 
spicules. It somewhat resembles S. nitidulus , but has a much 
more elevated and prominent keel. 
Habitat. Messina (Prof. G. O. Sars), 20-30 fathoms; only 
a single example. 
3. Solenopus Dalyellii , Kor. & Dan. 
Vermiculus crassus , Dalyell ? 
Body round, thick, somewhat elongate; back convex, with¬ 
out a keel ; belly flat. The largest specimen 20 millirns. 
long, 7 millirns. broad in the middle; towards the anterior 
