178 
BRITISH ENT0M0STUACA. 
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 third 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 
water 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 
