Monoculi differ in their ilruclure and appearance from 
ihofe of the generality of infedts, and feem compofed 
of a number of fmaller eyes or globular parts united 
jay the fame external tunic. It may alfo be obferved 
that the genus Monoculus is very nearly allied to that 
of Cancer, which contains the Crab and Lobfter tribe. 
