12 Nils Hj. Odhner. 
Body vermiform, of a circular or ovate section, without dor- 
sal keel. Cuticula thick with multicellular hypodermic papillae and 
two to three layers of tangential needle-shaped hollow spicules 
crossing each other almost at right angles. Ventral furrow with 
a single fold, separated from the cloacal cavity by a minute inva- 
gination. 
Pharynx of a large extension in length and breadth with a 
pair of lateral diverticula in front of the radula. The latter dis- 
tichous, abnormously formed and projecting into the preradular 
lateral diverticles. Teeth of the radula of bifold shape: in the 
frontal lateral portions each with one upper spine projecting 
forward and outward from the thin erect basal plate; in the 
median part thin, elongate and lamellifiorm, with only a short 
upper denticle. Ventral salivary glands minute, ovoid, embedded 
in the pharyngeal musculature. Intestine with only a trace of 
anterior coecum. 
Coelomoducts with each a large vesicular appendage, their 
distal legs (shell gland) wide and joined to an unpaired pouch 
before opening beneath the anus. A pair of copulatory organs 
each armed with two spines opening at its sides into the cloacal 
chamber; behind them two vesiculae (sac-formed glands) debouching 
beneath the shell gland. | 
Cloacal cavity with a circlet of gill folds inside the margins. 
Simrothiella margaritacea KOREN & DANIELSSEN 1877 (Solenopus). 
| (Figs. 1—16). 
Kvitingsøerne, Stavanger, 75—115 m, 2 sps. max. 1. 12 (G. 
O. Sars; prototype; B) — Kopervik, 75—95 m, many sps, max. 
1. 10 (G. O. Sars; B, K) — ,Armauer Hansen“ St. 3, 62° 1’ N: 
0° 8' E, about 1400 m, 2 sps, max. I. 11 (2—/ 1914; B). | 
Diagnosis of the species: Body rounded at both ends, 
slightly broader posteriorly; its length about 10 times the breadth. 
Mouth small, subterminal, shortly separated from the pedal furrow. 
The latter contains a single fold and is, though seemingly conti- 
nuous with, in reality separated from, the somewhat widened, 
oblong cloacal cavity, which is surrounded by simple thickened, 
not involuted lips. Gills 20. Colour whitish. 
