318 Luminousness of the Sea. 
possessing great rapidity of motion, and almost eluding ob- 
servation as it darts through the water ; body oblong, divided 
into six segments; tail consisting of two long fine hairs or 
setae, fully the length of the body of the animal; eye, gne ; 
antennz two, linear, beset with setze ; feet about five on each 
side; a very distinct species from the last, and very different 
from any of Muller’s. Fig. 83. e is the more common of the 
two, occurring in the Atlantic, Straits of Malacca, &c.; f I 
only observed in the Straits of Malacca. Fig. 83. ¢ belongs 
to a different genus altogether ; head and body in one; very 
obtuse at the upper extremity, and gradually tapering towards 
the tail, which consists of two divisions, each terminated by a 
cluster of fine setae; eyes two, lateral and inferior. From 
under these, on each side, are projected two short antennz. I 
could only see this animal in a prone situation, and on that 
account could only see two legs near his lower extremity. 
The colour of this curious little creature was of a beautiful 
silvery hue, with a pearly lustre: the body was tr ansparent, 
and his viscera and red blood could be distinctly seen in con- 
stant motion. Natural size, a grain of sand; found in the 
Straits of Malacca. Fig. 83. i is an exceedingly minute 
animal, but not possessing such celerity ‘of motion as several 
of the astaneatenell - ; head rather large and obtuse; body 
oval, connected to the head by a narrower portion, or neck ; 
eyes, two; antennez four, the inferior of the two shorter than 
the upper ones; no tail; lower extremity of the body emar- 
ginate ; body hairy ; natatory feet collected into three clusters 
on each side, nearly half the length of the body. This ani- 
mal was quite transparent, and in ’ the upper part of the body 
the mouth could be distinctly seen, of an oval shape, opening 
and shutting at the will of the animal. Habitat, Straits of Ma- 
lacca. 
These little animals are extremely interesting in many 
respects; but there was one which I observed still more so 
than any other yet described, not from his motions, which 
were surpassed in quickness by the Cyclops, nor from his 
colour, which was far exceeded by Sig 83.2, but from his ani- 
mal economy and the curious provisions with which he is en- 
dowed for catching his food. ‘This extremely interesting little 
animal is represented in fig. 83.7, and appears to belong to the 
same genus as the last. Body oblong, divided into five seg- 
ments, the upper one the largest, the lower one oval and 
smaller than the rest; head large and obtuse; eyes two; 
antennee four, two on each side, one much shorter than the 
other; natatory feet consisting of four clusters, two on each 
side, as long as the body of the animal, which was covered at 
