Plate 7. 



Figs. 31-37. Lychuopoles argeuteolus Garman. 



Fio. ,j1. The fish seen froni the side. Drawing; n.itural size, a, anal radiating organs ; 

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

 medial lateral radiating oi'gans ; i>\>, oiiercular radiating organs; ))l, posterior 

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

 radiating organs. 



Fi"-. 32. The lish seen from helow. Drawing; natural size, a, anal radiating organs; 

 al, anterior lateral radiating orgau.s ; ao, anteorbital radiating organs ; ma, 

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

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

 radiating organs ; vt, ventrotlioracic radiating organs. 



Fio. 33. The head of the tish with distended hiwer jaw seen from Ijelow. Drawing; nat- 

 ural size, br, braneiiiiistegal radiating organs; g, guttural radialiug organs; 

 ma, manilibular radiating organs. 



Fig. 34. I'art of an axial section vertical to the median plane of the fisli llirdugh a medial 

 lateral radiating organ showing the outer region. Stained: hacmatoxylin-picric 

 acid-fuchsin. Drawing; magnilied 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 tlie 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. Fart of an axial section vertical to tlie median plane of the fish through a medial 

 lateral radiating organ showing (jart of a facet of the middle region in longi- 

 tudinal section. Stained: haematoxylin-picric acid-fuchsin. Drawing; magnilied 

 1 :700. c, connective-tissue meinl)rane forming the wall of this facet; en, slen- 

 der axial can.al in the facet; nu, nuclei of the cells; pli, only slightly stainable 

 proximal jjortion of the cells; pt, highly stainable distal portion of the 

 cells. 



Fig. 37. Axial section vertical to the median [ilane of the lish through a medial lateral 

 radiating organ. Stained : haematoxylin-iiicric 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 p.araboloidal 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 organ ; g, inner region of the organ ; gl, gel- 

 atinous superficial portion of the tissue occupj'ing 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 ; p, pigment sheath ; r, reflecting layer ; s, outer 

 region of the organ. 



