BRITISH STALK-EYED CRUSTACEA. 141 
organs are divided above by a rostrum, which, from being 
prominent and serrated as in the Palemonide, become a simple 
rounded continuation of the carapace, as in Portunus arcuatus. 
The development of new antenne differs somewhat from that of 
the other limbs, for it is found in a spiral coil enveloped in a case, 
which, being thrown off at the period of moulting, the new organ 
uncoils and hardens into its normal position. 
The mouth organs will be more fully considered when we 
come to the question of food. 
The following is a short glossary of terms which we shall 
hereafter use, from time to time, in describing the external 
organs or parts of the Podophthalma. If any others should arise 
we shall explain them on the first occasion of their use. 
Arpomen.—In the Macroura that part which commences at the end of the 
cephalothorax, commonly called tail; in the Brachyura and some of 
the Anomoura, that which folds under the cephalothorax (q. v.). 
AMBULATORY APPENDAGES.—The legs used for walking. 
ANTENN&, EXTERNAL.—The outer and longer feelers. 
ANTENNE, INTERNAL, OF ANTENNULES.—The inner and lesser feelers. 
ANTENNAL scaALE.—The flat process attached to the base of the antenne in 
the Macroura. 
AUDITORY ORIFICE.—A small orifice on the epistome (q. v.) near the base 
of the antenne. 
Basa Joint, or coxopopitE.—The joint next the carapace. 
Brancatz.—The gills, or breathing organs. 
BraNcHIAL CHAMBER.—The cavity in which the branchiz are placed. 
Carapacr.—The upper covering of the cephalothorax (q. v.). 
CEPHALOTHORAX.—The carapace and thorax, or that part before the abdomen. 
CoxopopitE.—See Basa Joint. 
EpistomE.—The plate on the cephalothorax between the basal joint of the 
antenne and the mouth organs. 
ExoskELETON.— The whole of the external shell or covering. 
Eyn-sraLK.—The process which bears the visual organ. 
FINGERS, or FORCKPS.—See Hanns. 
Hanps.—The terminal joint of the auterior legs, carrying the fingers, of 
which one only is movable. 
Manpisies.—The organs of mastication. 
MaxtLiipepEes.—The foot-jaws. 
Orpits.—The cavities wherein the eye-stalks are coutained. 
Ova.—The eggs, or spawn. 
Patrus.—The spine attached to the base of the external antenne. 
Pepuncre.—The stalk, or that part of the antenne up to the third joint. 
