Norwegian Solenogastres. 21 
by the glandular elements among the roots of the septal muscles. 
The weaker lateral ones run above the middle height of the body 
entirely inside the muscular wall (fig. 21). 
The lateral parts of the transversal section are occupied by 
the diverticula of the intestine; outside their ramifications large 
lymphatic lacunae open, filled with crowded spherical blood 
corpuscles of the same kind as in the ventral vessel. 
The walls of the intestine form numerous plicae and bran- 
ching diverticula, and are lined with rather small secretory cells. 
The whole upper wall, fixed to the gonads, bears a low ciliated 
epithelium without glandular cells. 
Dorsally of the intestine the large genital glands extend 
throughout the body; they were filled with masses of products, 
ova in the middle generating on both sides of the thin, greatly 
folded median septum, and spermatids in the lateral parts (fig. 
21). The ova are covered with a vitelline membrane, not with a 
follicle epithelium. - Both kinds of sexual products matured 
simultaneously and were found passing side by side through the 
pericardium, the spermatids in the shape of balloon-shaped 
aggregations. In the hermaphrodite’ gland the spermatids origi- 
nate in large crowded folliculi which open directly from their 
interior into the gonoduct. 
The pericardium is very spacious (fig. 24) and the coelomo- 
ducts comparatively simple with a narrow proximal canal and a 
wider distal one (fig. 20); the latter bipartites into an anterior 
bladder with thin walls and a posterior shell gland with thick 
walls. The shell gland is unpaired for a short space in the me- 
dian line and opens with a median aperture into the lower part 
of the cloaca. No vesicula seminalis and no copulatory appara- 
tus nor any accessory genital organs are present. The upper walls 
of the gonadial tubes are lined interiorly with a ciliated epithelium; 
the respective part of the lumen evidently serves as vas deferens. 
The pharynx (fig. 23) has.very muscular walls. and lacks a 
radula. It forms a thin sac just in front of the oesophagus. The 
latter is furnished with a pair of long ventral salivary glands 
Opening separately into the lower end of the oesophagus, above 
the thin sac. The intestine has a dorsal coecum which extends 
as far as the brain and shows the peculiarity of being paired, 
a feature due to the strong development of the hermaphrodite 
gland which entirely divides it along the median line. In the 
