eyed " class, with the remark that no one of them has any 

 interest for us except from a scientific point of view. 

 Practically, so far as they affect us at all, they are objection- 

 able. To them belong the " Hoppers " which make our 

 beaches, and especially those on which sea-weed is apt to 

 accumulate, unbearable on a hot summer's day, and as well 

 that curse of the fisherman who uses trammel nets, one of 

 the gammaridae which, in countless numbers, will clean to 

 the bone, within eight hours, a fish caught in the net, and 

 send it up as white and neat as ever the Royal College of 

 Surgeons set up a skeleton. 



I think I may say that so far as the word " crustacean " 

 conveys any definite idea to the minds of the majority of 

 those here it carries the meaning of " crabs .and lobsters ; " 

 and I take these animals, which are not unimportant as 

 sources of food supply, with the addition of prawns and 

 shrimps, and their congeners, as the subject of my present 

 paper. 



If you will look at the next lobster, or crab, or shrimp, 

 which you may see, you will, with the delicate use of a fork 

 in the case of a boiled specimen, find that it has, or had, an 

 eye placed at the top of a stalk, or pedestal, based within 

 the socket of the eye on a moveable mechanical joint, and 

 there receiving the usual information from the brain of the 

 creature through the nerves. You will find that the socket 

 of this eye is invariably protected by spines of a strength 

 proportionate to the size of the creature, and that this eye 

 can be projected or retracted at the will of the shell fish. 

 It resembles in some respects the telescopic eye of the snail, 

 but it is not capable of anything like the same protrusion 

 nor is it so mobile. In the " shrimps " the eye at its full 

 protusion and elevation rises above the level back of the 

 animal to an extent which enables it to see all round it. 



