178 BRITISH ENTOMOSTRACA. 



curious little creatures. The two species here described 

 were dredged by Mr. M'Andrew from a considerable 

 depth, and were preserved dry ; and the species described 

 by me in the ' Annals and Magazine of Natural History' 

 as inhabiting the Atlantic Ocean, was brought on board 

 by means of the towing-net by Mr. Adams. Nothing of 

 their habits, therefore, could be observed by either of 

 these gentlemen ; neither does M. Edwards give us any 

 information with regard to them. 



Among the various interesting drawings of Crustacea, 

 however, made by Mr. Adams, during the voyage of 

 H.M.S. Samarang, there was one kindly placed in my 

 hands by him, which appears to represent another species 

 of this genus. It was brought on board by the towing- 

 net in the Sooloo Sea. Mr. Adams describes it as very 

 quick in its motions, darting about with great velocity, 

 and constantly revolving. He observed it, as well as the 

 above-mentioned species, to be highly luminous. 



M, Godeheu de Riville, in his paper on the luminosity 

 of the sea, published in 1760, in the thud volume of the 

 ' Memoires pour les Savans Etrangers,' describes and 

 figures a small Entomostracon, which I think must belong 

 to the genus in question, and of whose luminous pro- 

 perties he gives a very interesting description. Sailing 

 along the coast of Malabar, when in 8° 47' north lat., 

 and in 73° east long, of Paris, the sea was observed to 

 be unusually and most brilliantly luminous. Having had 

 his attention previously directed to this interesting phe- 

 nomenon, Riville determined to ascertain the cause. The 

 Avater all round the vessel, and to a considerable distance 

 from it, was white as snow ; and, in the wake of the ship, 

 innumerable star-like bodies of a still brighter lustre 

 sparkled on the surface of the agitated surf. He had 

 some water drawn up from alongside, and he then ob- 

 served numerous, bright, sparkling spots in the bucket in 

 which it was contained. Pouring it out upon a piece of 

 linen, numbers of small bodies still giving out light, were 

 observed adhering to the surface of the cloth. They were 



