176 THE RADIATING ORGANS OF THE DEEP SEA FISHES. 
I have described (87, p. 303, Plate 70, Figs. 15-24) the radiating organs 
of Sternoplyx diaphana. In that species extensive radiating organs are met 
with on the lips, and I think that such may also be present in S. obscura ; 
but as that portion of the specimen at my disposal is somewhat injured 
[ cannot express myself with certainty on this point. The glandular tubes 
as figured (’87, Plate 70, Fig. 20) in the inner coalesced regions of the 
ventrothoracic organs cannot be made out in S. obscura; in this fish they 
appear to consist, as in Argyropelecus, of an alveolar network containing 
large, roundish cells. 
Lychnopoles argenteolus Garman. 
Plate 7, Figs. 31-37. 
This species has been described by Garman (’99, p. 244, Plate 53, Figs. 4, 
4a). The radiating organs appear as spots, 700 4 in diameter, with a 
silvery lustre, and are pretty conspicuous. There are on each side | ante- 
o¢ 
orbital (Plate 7, Figs. 31, 32 ao), 1 mandibular (Figs. 32, 383 ma), 11 bran- 
chiostegal (Fig. 33 br) 9 guttural (Figs. 83 g), 2 opercular (Figs. 31, 32 op), 
14 ventrothoracic (Figs. 31, 32 vt) — Garman (’99, p. 245) counts 15 of 
these —19 ventromedial (Figs. 31, 32 ve), 22 anal (Figs. 51, 32 a), 11 anterior 
lateral (Figs. 31, 32 al), 10 mediolateral (Figs. 31, 32 ml), and 22 posterior 
lateral (Figs. 31, 32 pl) radiating organs. Garman (99, p. 246) states that 
there are besides these two parallel rows of radiating organs on the sides 
of the body. In the partly injured specimen at my disposal these could 
not be made out. 
With the exception of the anteorbital organ which is somewhat peculiar 
and which will be described below, all the radiating organs mentioned have 
the same external and internal structure. They consist, as in Argyro- 
pelecus and Sternoptyx, of two parts, a proximal and a distal. ‘The proxi- 
mal part (Plate 7, Fig. 37 A) is approximately spherical and forms about 
three quarters of a sphere. The constriction (C) between the proximal and 
distal part is well defined but shallow, so that the “neck” of the organ has 
a considerable breadth. The distal part (D) appears as a broad and some- 
what short rotation paraboloid, obliquely cut off where it abuts on the 
surface of the body. The blood vessels in the subcutaneous connective 
tissue surrounding the organ (b) are more numerous close to the pigment 
sheath than elsewhere. The pigment sheath (Plate 7, Figs. 35,37 p.) is stout, 
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