Zoology. 463 
BRANCHIAL EYES or BRANCHIOMMA.—Branchiomma is à 
genus of Sabillid worms remarkable for possessing eyes on the tips 
of its gills. C. Brunotte (Comptes Rendus, 1888, p. 301) has re- 
cently described the structure of these, arriving at the following 
conclusions. They are to be regarded as a new type of compound 
eye formed of two layers, an outer dioptric and an inner sensory. 
The outer surface is facetted and beneath each facet is found a small 
spherical lens situated above a rounded cavity which is filled with a 
large nucleated cell, and behind this is an elongated refractive body 
connected with terminations of the optic nerve. This part of the 
eye is without pigment. 
PHOSPHORESCENT ORGANS OF THysaNopopa.—R. Vallentin 
and J. T. Cunningham discuss the structure and functions of the 
phosphorescent organs of Thysanopoda (Nyctiphanes) norvegica in 
the February number of the Quart. Jour. Micros. Science. These 
crustacea have long been known to have eye-like organs upon the 
sides of the body and in the median line,—organs which were uni- 
versally regarded as accessory eyes until the present decade. There 
are ten of these organs, their distribution being pretty uniform in 
all the genera of the family Euphauside to which Thysanopoda 
belongs. All of these organs except those on the peduncles of the 
eyes have the same structure. Behind the organ is bounded by a 
layer of wavy lamine forming a hemispherical unperforated cup 
open in front. This is compared to the reflector described by von 
Lendenfeld in Fishes (vide Amer. Nat. xxii.). This reflector is 
lined internally with red mesodermic pigment-cells, and their in- 
terior are lined by a layer of large columnar cells, inside of which 
1S a curious fibrillar structure which surrounds the inner half of the 
lconvex lens, Outside the lens occur a circular cornea follow 
y the ordinary epidermis and the usual cuticle. All of the cellular 
give out, occasionally, short flashes of light. When touched with 
the hand a flash i 
Oe certain particles were luminous and remained so until dry. 
produced activity of the or Careful mi ical stud 
ct gans. Careful microscopica y 
Sosa that in the light the inner surface of the reflector 
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