Plate 7. 



Figs. 31-37. Lycbnopoles argenteolus Garman. 



Fig. 31. The fish seen from the side. Drawing; natural size, a, anal radiating organs ; 

 al, anterior lateral radiating organs; ao, anteorbital radiating organs; nil, 

 medial lateral radiating organs; op, opercular radiating organs; pi, posterior 

 lateral radiating organs ; ve, ventromedial radiating organs ; vt, ventrothoracic 

 radiating organs. 



Fig. 32. The iish seen from hclovv. Drawing; natural size, a, anal radiating organs ; 

 al, anterior lateral radiating organs; ao, anteorbital radiating organs ; ma, 

 mandibular radiating organs ; ml, medial lateial radiating organs ; op, opercular 

 radiating organs ; pi, posterior lateral radiating organs ; vs, ventromedial 

 radiating organs ; vt, ventrothoracic radiating organs. 



Fio-. 33. The head of the Iish with distended lower jaw seen from below. Drawing; nat- 

 ural size, br, branchiostegal radiating organs; g, guttural radiating organs; 

 ma, mandibular radiating organs. 



Fig. 34. 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 1 : 180. c, connective-tissue membrane 

 forming the walls of the facets ; gl, gelatinous tissue occupying the distal part 

 of the organ ; o, 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. 



Fig. 35. Transverse section of the outer region of a medial lateral radiating organ. 

 Stained : haematoxylin-picric acid-fuchsin. Drawing ; magnified 1 : 350. c, con- 

 nective-tissue membrane forming the walls of the facets ; o, cavity in the 

 central part of a facet; p, pigment sheath; r, reflecting layer; sp, straight 

 longitudinal spindle-shaped cells in the distal part of the facets. 



Fig. 36. 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 

 1 : 700. e, 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. 



Fig. 37. Axial section vertical to the median plane of the fish through a medial lateral 

 radiating organ. Stained: haematoxylin-picric acid fuchsin. Drawing; magni- 

 fied 1 : 110. A, proximal spherical part of the organ; b, blood vessels outside 

 the pigment sheath ; C, constriction between the proximal spherical and the 

 distal paraboloidal part of the organ ; c, 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; cm, radial 

 facets of the inner part of the middle region ; co, longitudinal facets of the 

 outer part of the middle region; cr, outer connective-tissue sheath of the organ ; 

 D, distal paraboloidal part of the jrgan ; g, inner region of the organ ; gl, gel- 

 atinous superficial portion of the tissue occupying tlie 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; p, pigment sheath; r, reflecting layer ; s, outer 

 region of the organ. 



