194 THE RADIATING ORGANS OF THE DEEP SEA FISHES, 
The suborbital radiating organs (Plate 10, Fig. 47 so) are represented 
by Garman in his figure (’99, Plate 56, Fig. 3), but not mentioned in his 
description (’99, pp. 276, 277). The suborbital organ lies below and behind 
the eye; it appears nearly spherical, is 800 fin diameter, and enclosed 
in a pigment sheath and a connective-tissue capsule. The pigment sheath 
forms a sac, the opening of which abuts on the surface of the fish. It is 
composed of concentric layers of rather loosely scattered cells containing 
brown pigment. Within this pigment sheath lies the connective-tissue cap- 
sule. The structure of the inner cell mass could not clearly be madé out, as 
these organs were somewhat injured in the specimens at my disposal. 
The simple radiating organs without pigment sheath appear as small 
white dots 100 in diameter. They are scattered in great numbers over 
the ventral side of the fish and also occur in the three terminal threads of 
the barbel mentioned above. They are more or less spherical, enclosed in 
connective-tissue capsules and composed of pretty large radially arranged 
cells with conspicuous nuclei, 
The simple radiating organs with pigment sheath are met with on the 
hexagonal scales of the body and also on the head of the fish. They appear 
as dark spots and measure 300 in diameter. On each ventral scale a 
group of 7 of these organs occurs, upwards they gradually become scarcer, 
and near the dorsal medial line of the fish only one such organ is found on 
each scale. In their structure these organs resemble the simple radiating 
organs with pigment sheath of Chauliodus barbatus described above. The 
hyaline mass which in the latter covers the organ outside, is, however, 
absent in these organs of Stomias heaagonalus. 
The compound radiating organs with pigment sheath (Plate 10, Figs. 47, 
48, 49, 51) appear as conspicuous dots with a silvery lustre and are 300- 
900 in diameter. On the whole they are largest in front and decrease in 
size backwards. There are on each side of the bod y 12 guttural (Plate 10, 
Figs. 47, 48 g), 16 branchiostegal, 38 ventrothoracic (Figs. 47, 48 vt), above 
these in a parallel row 37 anterior lateral (Figs. 47, 48 al), 10 ventromedial 
(Figs. 47, 48 ve), 10 medial lateral (Figs. 47, 48 ml), and 19 ventroanal 
(Figs. 47, 48 a) compound radiating organs with pigment sheath. 
Two different kinds of these organs can be distinguished. The first 
somewhat larger kind is represented by the anterior compound organs of 
the body which form the ventrothoracic and anterior lateral rows. All the 
other compound organs belong to the second, smaller kind. 
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