^4 ON LUMINOUS ANIMALS. 



heavier, aud more nauseous to the taste; it is therefore 

 advisable always to strain seawater before it is drunk. 



The luminous property does not appear to have any con- 

 riectlon with the economy of the animals that possess it, 

 except in the flying insects, which by this means discover 

 each other at night, for the purpose of sexual congress. 



Explanation of the Figures. 



^Explanation ^*K* ^*' '^^^ cancer fulgens, discovered by the Right 

 of the plates. Hon. Sir Joseph Banks, of the natural size. 



Fig. 2. The same animal magnified. 



Fig. 3. 1 he medusa pellucens, also found by Sir Joseph 

 Banks, represented ot the natural magnitude. 



Fig. 4. The limuluH noctilueus, discovered by Captai^ 

 Horsburgh, conbiderably enlarged. ^,^^j| .^.j. ,,, . 



Fig. 5. The luminous medusa, discovered by me, which 

 I conceive to be the medusa hemispherica : it is shown of 

 the largest size 1 met with. 



Fig. t). The central process of this animal's body magni- 

 fied, in order to explain its structure, The thick tentacula 

 in which it terminates are se«ncpyer^<jlwith small cups or 

 suckers. 



Fig. 7. The beroe fulgens, discovered by me, shown in 

 its most elongated or relaxed form, which ^t j*^rop coni- 

 ' monly when swmimiug quickly. ,,.»?■• \f^• f. '* 



Fig. 8. The same animal in the most contracted form. 



Fig. 9. The mmute species of medusa, discovered by 

 me, which is the most frequent cau«e of the luminous ap- 

 pearance of the sea, repret-ented of the natural size. 



Fig. 10. The same animal magnified, exhibiting aj)uck- 

 cred or tucked-in appearance on one sid^.^^pH -^l ui»i'i 



Fig. 11. Is the animalcule discovered .l^y^-^l^ptfff^iftf.^he 

 natural size. . .,:, . i ..: ;;>:.' t-= yj^,:? ^,- 



Fig. 12. The same, greatly magnified, to show the in- 

 testinal parts. Both these figures are copied from the ori- 

 ginal drawings, in the possession of the Right Hon, Sir 

 Joseph Banks. 



• Figs 1,2, and 3, will be found in plate IX cf the preceding vo- 

 limic, the rest in plate II of this. 



Fig. 13. 



