Fig. 31. 
Fig. 32. 
Fig. 33. 
e 
Fig. 34. 
Fig. 35. 
Fig. 36. 
Fig. 37. 
PLATE 7. 
Figs. 81-37. I sychnopoles argenteolus Garman. 
The fish seen from the side. ° Drawing; natural size. a, anal radiating organs ; 
al, anterior lateral radiating organs; 0; anteorbital radiating organs; ml, 
medial lateral radiating organs; OP» opercular radiating organs; pl, posterior 
lateral radiating organs; Ve, ventromedial radiating organs ; vt, yentrothoracic 
radiating organs. 
The fish seen from below. Drawing; natural size. 4, anal radiating organs ; 
al, anterior lateral radiating organs; a0, anteorbital radiating organs; ™a, 
mandibular radiating organs ; ml, medial lateral radiating organs; OP, opercular 
radiating organs ; pl, posterior lateral radiating organs; VS, ventromedial 
radiating organs; V6, yentrothoracie radiating organs. 
The head of the fish with distended lower jaw seen from below. Drawing ; nat- 
ural size. br, pranchiostegal radiating organs; g, guttural radiating organs; 
ma, mandibular ‘adiating organs. 
Part of an axial section vertical to the median plane of the fish through a medial 
lateral radiating organ showing the outer region. Stained : haematoxylin-picric 
acid-fuchsin. Drawing; magnified Le LOO? 2, connective-tissue membrane 
forming the walls of the facets; gl, gelatinous tissue occupying the distal part 
of the organ; 0, cavity in the central part of the facets; sc, curved oblique 
cells in the proximal part of the facets; sp, straight longitudinal spindle- 
shaped cells in the distal part of the facets. 
Transverse section of the outer region of a medial lateral radiating organ. 
Stained : haematoxylin-picric acid-fuchsin. Drawing ; magnified 1:350. ¢, con- 
nective-tissue membrane forming the walls of the facets; 0, cavity in the 
central part of a facet; Pp, pigment sheath; 1, reflecting layer; §Dp, straight 
longitudinal spindle-shaped cells in the distal part of the facets. 
Part of an axial section vertical to the median plane of the fish through a medial 
lateral radiating organ showing part of a facet of the middle region in longi- 
tudinal section. Stained : haematoxylin-picric acid-fuchsin. Drawing ; magnified 
Lei00..-€; connective-tissue membrane forming the wall of this facet; en, slen- 
der axial canal in the facet; nu, nuclei of the cells; ph, only slightly stainable 
proximal portion of the cells; pt, highly stainable distal portion of the 
cells. é 
Axial section vertical to the median plane of the fish through a medial lateral 
radiating organ. Stained : haematox ylin-picric acid-fuchsin. Drawing; magni- 
fied 1:110. A, proximal spherical part of the organ; b, plood vessels outside 
the pigment sheath; ©, constriction between the proximal spherical and the 
distal- paraboloidal part of the organ; ¢, connective-tissue capsule lying within 
the reflecting layer; Cc, tubular cavity in the axial portion of the proximal part 
of the organ; Ci, radiating facets of the inner region of the organ; ¢m, radial 
facets of the inner part of the middle region; Co, longitudinal facets of the 
outer part of the middle region; er, outer connective-tissue sheath of the organ; 
D, distal paraboloidal part of the organ; g, inner region of the organ; ol, gel- 
atinous superficial portion of the tissue occupying the distal part of the organ; 
gr, granular basal portion of the tissue occupying the distal part of the organ; 
1, middle region of the organ; Pp, pigment sheath; 1, reflecting layer; 8, outer 
region of the organ. 
2) 
