196 THE RADIATING ORGANS OF THE DEEP SEA FISHES. 
minal face of the cylinder is rounded off, simple, convex; the inner, proxi- 
mal face is drawn out to form a regular cone about as high as broad, which 
penetrates the mass of radial conic cells occupying the proximal spherical 
part of the organ. The apex of this cone lies a little way above the centre 
of this sphere. The whole appears as a cylindroconic plug (Plate 10, Fig. 
51). From that part of the connective-tissue capsule of the organ which 
covers the terminal face of this plug, diverticula extend inwards parallel to 
the axis. These form parallel facets. The central (axial) facet (cc) is the 
longest ; it extends to the apex of the cone, whilst towards the sides of the 
cylinder the facets become shorter. Transverse (Plate 10, Fig. 49) and 
longitudinal axial (Plate 10, Fig. 51) sections of the plug-shaped outer part 
of the organ show that the contents of the central facet (Plate 10, Figs. 49, 
51 cc) are different from those of the other facets (pc). In staining with 
Van Gieson’s haematoxylin-picric acid-fuchsin one finds that the latter take 
up haematoxylin and acid-fuchsin very readily, whilst the substance in the 
central facet absorbs only the picric acid. It also stains with eosin. In the 
distal parts of the outer facets nuclei and cell limits can be distinctly seen ; 
here pretty large elongate cells are situated. In transverse sections of the 
distal part of the plug one sees two or three cell sections lying side by side 
in each facet (Plate 10, Fig. 49). In the proximal parts of the outer facets 
and throughout the whole length of the central facet cell limits cannot be 
made out and nuclei are hardly to be seen. 
Ussow (’79, p. 91) has described these organs in Slomias barbatus. Te 
says that they are similar to those of Chauliodus, but that the middle region, 
which he represents as a mushroom-shaped body (see above) in Chauliodus 
sloant, is absent, in Stomias barbatus. 
Organs similar to these have been described by Chiarini (’00, p. 12, Fig. 3) 
from Maurolicus poweriae, Te says that each of the cells of the inner spheri- 
cal part and also of the cylindroconic plug, that is, the “neck” of the organ, 
often contain ¢wo nuclei. These cells are always mononuclear in Sfomias 
hexagonalus. In longitudinal sections the limits between the cells are often 
so indistinct that one can indeed be easily misled on this point and imagine 
that the two or three nuclei seen imbedded in an apparently continous pro- 
toplasmatic mass belong to one and the same cell. Transverse sections, how- 
ever, show, at least in the distal part, the cell limits well enough and make it 
clear that here each nucleus belongs to a separate cell. 
The compound radiating organs of the second kind which are met with 
sean ae 
