Norwegian Solenogastres. 37 
single layer of cylindric ciliated cells. In the median line there can be 
traced a stripe of this epithelium bounded by furrows. At the lateral 
sides of the gonads this epithelium passes into the secretory one 
of the remaining intestine, where it is greatly elevated and folded. 
On the under side of the intestine runs the ventral sinus; it 
is divided throughout by means of a strong horizontal septum. 
Both portions of it, however, contain the same kinds of corpusc- 
les: ovoid or spherical cells with a parietal nucleus and a sub- 
stance of the same size, elongated or spherical and stained with 
red (eosin). These features were observed as prevailing in one 
of the specimens. In the other (the prototype) the blood cor- 
puscles had central nuclei and a granular content only faintly 
coloured. These distinctions in appearance were certainly due to 
the different states of preservation, which doubtless influence the 
structure: WIREN in Neomenia (1892, p. 63) describes the blood 
corpuscles as hyaline, without structure, and containing a central 
nucleus which may, however, be absent. 
The blood corpuscles fill the whole lacunar system at the 
sides of the: intestine and between the latter and the genital folli- 
culi. In the prototype the circumintestinal space was considerably 
narrower than in the other specimen, probably a secondary conse- 
quence of the preservation. 
The ventral musculature displayed the peculiarity that the 
longitudinal fascicles formed on each side a distinct cord (fig. 58, 
l. m.) separated from and lodged in a furrow on the upper side 
of the remaining part of the layer — a similar cord is described 
by Pruvor 1891 in Nematomenia banyulensis and Proneomenia 
sopita, — which retained a greater thickness on the ventral side 
than elsewhere. At the sides of the ventral furrow it was some- 
what elevated, and hence rather powerful diagonal muscles radiate 
between the diverticula of the intestine to the lateral and dorsal 
sides of the body. 
On both sides of the root of these muscles the well developed 
pedal gland extends through the body, and outside it the two pedal 
nerve cords. The lateral ones are of equal strength and run 
above the middle of the body side. 
The median ventral fold has an epithelial covering of high 
ciliated cells on both sides, and a ventral tissue of about the 
same breadth as the epithelium. The two lateral folds lack this 
tissue and have their epithelium covered with a thin cuticula on 
both sides, a continuation of the main cuticula. 
