SI 8 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, one ; 

 antennae two, linear, beset with setae ; feet about five on each 

 side ; a very distinct species from the last, and very different 

 from any of MuUer's. Fig. 83. ^ is the more common of the 

 two, occurring in the Atlantic, Straits of Malacca, &c. ; y I 

 only observed in the Straits of Malacca. Fig. S3.g 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 antennae. 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 transparent, 

 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. h is an exceedingly minute 

 animal, but not possessing such celerity of motion as several 

 of the last-mentioned ; head rather large and obtuse ; body 

 oval, connected to the head by a narrower portion, or neck ; 

 eyes, two; antennae 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 hy Jig. S3.g, 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 Jig. 83. i, 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; 

 antennae 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 



