192 THE RADIATING ORGANS OF THE DEEP SEA FISHES. 
sides of the head under the large suborbital organ with pigment sheath, and 
in six longitudinal rows, three on each side, of smaller groups on the body. 
The intervals between these small groups on the body are equal in extent to 
the intervals between the larger organs with pigment sheath, and the 
former alternate with the latter. 
The radiating organs with pigment sheath have a silvery lustre. Those 
of the body measure about 300 in diameter; the suborbitals are larger. 
There are on each side 1 suborbital (Plate 8, Fig. 41 so), 13 branchiostegal, 
10 guttural (Fig. 42 @), 25 ventrothoracic (Figs. 41, 42 vt), 20 ventromedial 
(Figs. 41, 42 ve), 35 ventroanal (Figs. 41, 42 a), 25 anterior lateral (Mig. 41 
al), 20 medial lateral (Fig. 41 ml), and 85 posterior lateral (Tig. 41 pl), 
radiating organs with pigment sheath. 
The small organs without pigment sheath are spherical, enclosed in a 
connective-tissue capsule, and composed of radially arranged cells, which 
usually enclose a central cavity. 
The organs with pigment sheath closely resemble the compound organs 
of Chauliodus barbatus described above. The suborbital organs are so dis- 
posed as to throw their radiation into the field of vision; the organs of the 
body are directed downward. 
Stomias hexagonatus Garman. 
Plate 10, Figs. 47-51. 
This species has been described by Garman (99, pp. 276, 277, Plate 96, 
Fig. 5). It possesses five different kinds of radiating organs. An organ in 
the barbel, a pair of suborbital organs, and on the body simple organs 
without pigment sheath, simple organs with pigment sheath, and compound 
organs with pigment sheath. 
The radiating organ in the barbel (Plate 10, Figs. 47, 48, 50), lies in a 
thickening 1.5 mm. long at the end of the barbel (Fig. 47,481). From 
its distal part three short terminal threads arise. The radiating organ itself 
(Plate 10, Fig. 50), is oval and placed transversely in the swelling of the 
barbel, the long axes of the two crossing nearly at right angles. It is 
enclosed in a stout connective-tissue sheath (Plate 10, Fig. 50 c), and com- 
posed of two parts, an upper, dorsal, smaller, dorsoventrally compressed (A), 
and a lower, ventral, spherical part (B). The smaller upper part is enclosed 
in a somewhat loose pigment sheath (p), lying within the upper part of the 
