Tnuminousness of the Sea. 317 
given to them as a defence and protection, and to enable them 
to take their prey in their deep and dark abodes in the 
fathomless waters of the ocean, it is extremely probable that 
it is given to the whole tribe of marine animals. Independently 
of this, however, some of these little creatures are extremely 
interesting, and, as little has been added to this order of 
beings since the time of Muller, figures and descriptions of 
several new species, although these are perhaps rather imper- 
fect, may still be worthy of notice ; and, even though they are 
not sufficiently correct to entitle eet to be classified and 
named, it is possible they may-assist future labourers in this 
much neglected branch of natural history. 
One of these Entomdéstraca, which occurred several times 
in company with those luminous animals already described 
( fg.81. abcd), and in considerable abundance when the 
sea was most luminous, is figured in fg. 83. @. The head and 
body are in one, flat, of an oval shape; tail double, each por- 
tion terminated by a fasciculus of fine hairs ; irene two, 
linear, armed with hairs or bristles on both sides, which 
point forwards; eyes two, situated laterally, and near: the 
upper part of the body. Near the lower extremity of the 
body, close to the tail, were two dark substances projecting 
outwards, most probably the ovaries. The body of the ani- 
mal was quite transparent, and showed the viscera and the 
red blood in motion ; natural size, a grain of sand. This little 
animal bears a considerable resemblance to one of Muller’s 
figures, a species of Cyclops; but as that genus is character- 
ised as having only one eye, and as I made out distinctly two 
in this specimen, I cannot, till another opportunity occurs of 
farther examination, fer it to that genus. Two other little 
creatures, however, occurred, which I have no hesitation in 
referring to the CHclops of Muller. ( fig. 83. e and 7) One or 
two species have been ascertained, by Sir C. Giesecké in Green- 
land, to be luminous, and Dr. WMincculloalt has added thirty- 
three new species in our own seas, all of them highly luminous. 
The first of these which I have represented (fie. 83. e) is an 
exceedingly nimble little creature; and, not being larger than 
a pin’s point, it required great attention to be able to follow 
its movements. ‘The body is of an oval shape, divided into 
five segments ; antenna two, linear, covered with prickles or 
hairs, and fully the length of the body; feet about five on each 
side; tail double, each division terminated by a number of 
fine hairs; eye, one; the round spots on the upper surface 
of the body are ova. This species somewhat resembles the 
C. ribens of Muller (Entoméstraca, tab. xvi. fig. 3.) ; it is, 
however, a very distinct species. £7g. 83. f is also a Cyclops, 
Y 3 
