258 General Notes. 
mias micripnus, Echiostoma barbatum, Pachystomias microdon, 
Astronesthes niger) are isolated and stand upright upon the surface, 
but are still more distinguished by the lack of a reflector. In 
others (Argyropelecus hemigymnus, Sternoptyx diaphana, Scopelus 
benoiti) the organ is provided with a shining reflector composed of 
needle-shaped or filiform elements. All of the foregoing are sunk 
in the skin, but in Xenodermichthys nodulosus occur simple organs 
which are provided with a pigmented mantle, and which project 
beyond the general surface and in some cases become stalked. In 
Halosaurus macrocheir and H. rostratus the organs are situated 
upon the scales of the lateral line and have a spindle shapé. 
The other main group of organs embrace irregular glands which 
may be scattered (Astronesthes niger), or be found on the under 
jaw (Argyropelecus hemigymnus, Sternoptyx diaphana); beneath the 
operculum (Halosawrus macrocheir); on the barbels and fin- 
rays (Opostomias micripnus, Malacosteus indicus); or may have 
a suborbital position, in the latter instance either having (Echios- 
toma barbatum, Pachystomias microdon, Malacosteus indicus, Scope- 
lus benoiti) or lacking a reflector (Opostomias micripnus, Astronesthes 
organs renders it probable that all are phosphorescent. Regarding 
the glandular organs the evidence is less direct, but judging from 
the analogy of other forms von Lendenfeld regards them as secreting 
a phosphorescent mucus. In both we have to deal with various 
modifications of the mucous canal system. Dr. von Lendenfeld 
states that the parietal organ of Sphenodon (Hatteria) has no 
homology with these organs, and that it is not, as has been sug- 
gested, a phosphorescent organ. 
EUTHERIA AND PrororHERtA.—In the AMERICAN NATURAL- 
ist for December, 1887 (vol. xxi., p. 1103), in a notice of “Thomas 
on Mammalian Dentition,” it is ‘‘ observed that the unnecessary 
terms Prototheria and Eutheria, which are generally ascribed to 
Professor Huxley in England, were really introduced by Professor 
Gill.” | 
Two quite different propositions were involved by the use of the 
terms used by Professor Huxley and myself. Professor Huxley 
