Angularity of its form is equalled by the elegance 
of its color, which is a beautiful pale blue, with a 
glofs of filver, while the margin of the whole body, 
and the tips of all the procefles w'ith which it is be- 
fct are of the richeft deep blue. It polTefles a high 
degree of mufcular power, and appears occafionally 
in various ftatcs of contradion and extenfion. Its 
general length is fomewhat more than an inch, the 
figure being flightly magnified, in order to Ihew the 
feveral parts with a greater degree of diftincfinefs. 
Like others of this genus it fwims principally on or 
near the furface of the fea, and is chiefly found in 
the Weft-Indian ocean. 
