Nils Hj. Odhner. 
each side of the cloaca; no radula; hypodermis a single 
cell-layer without papillae; I ventral fold ... 
Wirenia n. gen. 
RE mn. 09.088 ES W. argentea n. sp. 
2. Cloacal gills absent. 
a. Hypodermis with papillae; body with convex sides 
(mostly circular in section, not compressed); ventral 
fold or folds distinct; spicula chiefly needle-shaped ; 
radula polystichous in the following genera 
Fam. Proneomeniidae. 
- Gonoducts united posteriorly; one vesicula semi- 
nalis. 
Å. Spicula tangential and radial; no copulatory 
SPINES) ete Proneomenia Husrecut 1880 
Length 1! times breadth; rear body end roun- 
ded; ventral fold 1 (in the anterior end many). 
L. to 130 mm.... P. sluiteri Husrecnt 1880 
B. Spicula tangential, cross-ways arranged; a pair 
of copulatory spines; posterior end of body 
acuminate; length 25 times breadth 
Dorymenia Heatu 1911 
Ventral folds 3; gonoducts with an ampulla in 
front of the unpaired section of the shell gland. 
L.70 mm. D. sarsi Koren & DanieLssen 1877 
++ Gonoducts separated throughout; vesiculae semi- 
nales numerous; spicula tangential and radial 
Anamenia Nierstrasz 1908 
Ventral folds 3; back with a weak keel. L.25 mm 
A. borealis Koren & DanieLssen 1877. 
b. Hypodermis a single cell-layer without papillae; body 
sometimes compressed (sides concave); spicula hali- 
raised, mostly squamiform; ventral fold absent or 
indistinct; radula distichous or absent 
Fam. Lepidomeniidae 
Body usually compressed; besides the squamiform 
spicula narrower, stalked ones; radula and copulatory 
organs absent: 290 Nematomenia SimrotH 1893 
Oesophagus flexed towards front; all spicula with 
truncate, bases. Lo 14 simon Ger 
N. banyulensis Pruvot 1890, var. norvegica n. var. 
