MOXILTINO OF THE LOBSTER, 
85 
matter. Crabs also have the power of finding their way 
back to their original habitat when carried off even for 
several miles. 
The lobster spawns from March till November; the 
young are hatched with much of the form of the adult, not 
passing through a metamorphosis, as in most shrimps and 
crabs. They swim near the surface until about one inch 
long, afterwards remaining at or near the bottom. 
The lobster probably moult^ but once annually, during 
the warmer part of the year, after having nearly attained 
its maturity, and when about to moult, or cast its skin, the 
carapace splits from its hind edge as far as the base of the 
rostrum or beak, where it is too solid to separate. The 
lobster then draws its body out of the rent in the anterior 
part of the carapace. The claw — at this time soft, fleshy, 
and very watery — is drawn out through the basal joint, 
which is partly absorbed to allow the flesh to pass through 
the joint. In moulting, the stomach, with the solid teeth, 
is cast off with the old integument. 
Orders of Crustacea. , 
Order 1. Feet leaf -like, body usu- 
ally with a bivalve shell BrancMopoda : Brine Shrimp, etc. 
Order 2. Small, active, with free 
limbs; some parasitic Entomostraca : Cyclops, Fish-lice. 
Order 3. Large, fixed, body pro- 
tected by a shell of several 
pieces Cirripedia : Barnacles. 
Order 4. Body flat or compressed; 
no carapace; eyes sessile Tetradecapoda: Pill-bug, Beach-fleas. 
Order 5. Thoracic feet leaf -like; 
thorax covered by a carapace . . Phyllocarida : Nebalia. 
Order 6. Body partly covered 
with a large carapace ; feet 
with gills; eyes stalked TJioracostraca : Shrimps, Crabs. 
Literature. — Milne- Edwards, Histoire Katurelle des Criistaces. 
3 vols. 1834-40. — Dana, Crustacea of the U. S. Exploring Expedi- 
tion. 2 vols. 1852. — Gerstaecker, AxXh.To^odQn (in Bronn's Classen 
und Ordnungen des Thierreichs, 1866-91. 2 yo\s.— Huxley, The 
Crayfish, ISSO.— Packard, Monograph of North American Phyl- 
lopod Crustacea, 1883. — Also the writings of Say, Dohrn, Sars, 
Clans, Brooks, Hagen, Faxon, Smith, Kingsley, etc. 
