The Squill seems to form a connecting link between the last and present order. It is the only genus of the heterobranchial Crustacea in which [Pg 138]the eyes are placed on footstalks; the head, instead of being distinct, appears in a great measure drawn into the corslet. It has been called the Sea Mantis, from its bearing some resemblance to an insect of that name, on account of the singularly-formed hooks with which two of its foot-jaws are armed