Norwegian Solenogastres. 25 
The ventral folds are, as mentioned, 11 in number; the 
median one, however, is extremely small, forming only a minute 
riblet not higher than its breadth. For the rest, all the folds have 
a narrow cylindrical shape in section. They consist of a ciliated 
epithelial covering and a narrow interior tissue in which elongate 
nuclei are observed. 
Kruppomenia borealis n. sp. 
(Figs. 35—43). 
Body short and thick, length index 3: 1, somewhat higher 
and broader in the anterior half; anterior end rounded, posterior 
one truncated. Mouth ventral, cloacal opening terminal. Ventral 
furrow continuous from mouth to cloacal cavity, with one fold. 
Cuticula moderately thick, containing tangential and radiating 
spicula of one kind: hollow needles with thin walls (average 
length 0,16 mm), those of the posterior end longer and directed 
backward; a pair of bristles of long spicula cover the under-side 
of the cloacal cavity. Hypodermis cells large, forming low irre- 
gular prominences among the spicula, not differentiated into 
distinct papillae. 
Pharynx short, with thin walls and a small distichous radula, 
a large bipartite subepithelial gland and a pair of short cylindri- 
cal simple (not lobated) ventral salivary glands. Pharynx with 
a pair of short lateral processes in front of the radula. 
Intestine with a dorsally directed coecum. Pericardium with 
a dorsoventral extension. 
Coelomoducts bearing each a large receptaculum seminis 
with thin walls directed dorsally, and situated at the sides of 
the median shell gland. No accessory copulatory organs. 
Branchial folds numerous, cirriform, about 10 posteriorly and 
between them secondary and tertiary ones anteriorly. 
Dimensions: length 4.5, breadth 1.7, height 1.5 mm. Loca- 
lities: Sunde, Hardangerfjord, 1 sp., 1. 4.5 (K) — Bukkenfjord, 
esp. |. 4 (K). 
Though the Norwegian species described above differs in 
some essential characters from the type of the genus, K. minima, 
established by Nierstrasz in 1905 on some specimens from the 
Gulf of Naples, I nevertheless consider it most convenient to 
include it in the same genus the diagnosis of which must be 
