104 On a new kind of Phosphorescence observed 



given a detailed description of his species (C. Australis), the 

 only one hitherto known, in the 1st vol. of the Annates des Sci- 

 enc<}s NaturcUe. This author .states, that it is found in the Pacific 

 Ocean, and in the middle of the Atlantic Ocean, about 40 de- 

 grees south latitude. It forms, he says, very extensive banks, 

 which impart a red colour to the water, and which furnish a 

 plentiful supply of food to the whales frequenting those seas. 



Description of Plates. — Plate II L 



Fig. 1. Dorsal aspect of the anterior part of the body of the male 

 Balanus. 2. Abdominal do. 3. Abdominal aspect of the first and se- 

 cond segments of do. ; a, first segment. 4. Third pair of legs. 5. Fourth 

 pair of legs. 6. Fifth pair of legs ; 6, external organs of generation. 

 7. Parasite. 8. Second stage of the Larvee of Balanus Balanoides. 



Plate IV. 



Fig. 10. Male of Balanus Balanoides, abdominal aspect. 11. Larva; 

 of Balanus Tintinnabulum. 12. Ovum of do. 13. Ovum of Balanus 

 Balanoides. 14. Natural size. 15. First stage of Larva of Balanus 

 Balanoides. 16. Natural size. 17. Larvse of Pedunculated Cirriped, 

 drawn after a figure of Thompson's in the Philosophical Transactions 

 for 1835. 18. Natural size of the male Balanus. 



(To be concluded in our next Number^ 



On a new kind of Phosphorescence observed among certain 

 Annelides and Ophiuridw. By M. A. De Quatrefages. 



The phenomena of phosphorescence presented by living beings, so 

 worthy of attracting the attention of physiologists, as well as natural 

 philosophers, have yet been studied only in an incomplete manner. 

 This neglect is no doubt owing to the difficulty of the subject itself. 

 In fact, most of the animals in which this remarkable property 

 manifests itself with the greatest intensity, generally inhabit the sea. 

 The few opportunities for examining them that occur on the shores 

 of the ocean or of the Mediterranean, and the extreme difficulty of 

 conveying to the localities instruments of such delicacy as a careful 

 examination of these phenomena requires, have hitherto prevented this 

 subject from being treated with the care which it deserves. 



Notwithstanding the small number of facts and observations which 

 we possess in reference to it, we believe we may already conclude, 

 that under this common appellation of phosphorescence, we are 

 in the habit of uniting many phenomena which possess very dis- 

 tinct natures. We appear to confound the property which is in- 

 herent in some bodies, of disengaging light during their decom- 

 position, with the analogous phenomena which living beings present. 

 Among these, we have not hitherto established any distinction. It 



