EYE-LASHES AND EAR-SLITS 181 
longing to either the Phyllobranchiata or to the Tricho- 
branchiata, as the plumes consist of two rows of long 
slender filaments so closely impacted together that they 
are flattened into plates, and elsewhere he remarks that 
‘in some genera, as in T’halassina, the branchize are both 
foliaceous and filamentous.’ 
Family 1.—Thalassinide. 
The carapace is dorsally flattened, with rostrum. The 
eyes are small, the eye-stalks cylindrical. The first pair of 
antennee have the flagella long; the second have no scale 
on the second joint. The first pair of trunk-limbs are un- 
equal, imperfectly chelate, the last joint or finger being 
longer than the thumb; the four following pairs are 
simple, with the terminal joint long. In the pleon the 
uropods, that is, the appendages of the sixth segment, are 
slender and acute, the outer branch not transversely 
sutured ; the telson is also without suture, obtusely pointed. 
The branchiz are complex. 
The family includes but one genus. 
Thalassina, Latreille, 1806, has the characters of the 
family. It contains but few species, perhaps only the type 
Thalassina anomalus (Herbst, vol. 3, part 4, p. 45, 1804), 
which Latreille in 1806 called Thalassina scorpionoides. 
This is widely distributed in the Pacific. A specimen nine 
inches long was procured by the Challenger at Kandavu, one 
of the Fiji Islands. Some points of Mr. Spence Bate’s 
minute description will teach the student what to look for 
in various other species of the Macrura. For the small 
sub-conical eyes imperfect orbits are formed by help of the 
rostrum and depressions in the upper surface of the first 
antenne. Projecting forwards from the rostrum and 
upper part of the orbit and backwards from the antenneze 
are numerous hairs which form for the eyes a protecting 
fringe, which is in Greek the blephdris in English the 
eye-lashes. he basal joint of the first antennz has a 
long triangular slit, the opening of the ear, which is thus 
described :—‘ The auditory apparatus consists of a large 
