The Crayfish: An Introduction to the Study of Zoology

abdomen abdominal appendages abdominal somites ambulatory limbs Amurland animals antenna antennule aperture appears artery arthrobranchiæ Astacine Astacus fluviatilis Astacus torrentium attached basal joint blood body branchiæ branchial cavity carapace cardiac cavity cephalothorax cervical groove chelate chitinous convex corpuscles coxopodite cray Crustacea cuticle cuticular division ecdysis Écrevisses edge endopodite English crayfish epiblast epipodite exopodite exoskeleton eyestalk fact female filaments fluviatilis.-A forceps front ganglia ganglion gastrolith genus gills give rise green gland hind-gut hinder hypoblast inner integument lateral leptodactylus less lobster longitudinal male mandible mid-gut morphological muscle muscular nerve fibres nobilis noble crayfish nucleated cells nuclei organs ossicle outer pairs plate pleura podobranchia portion posterior prawns present pyloric region ridge rostrum segments septal lines setæ side somite species spermatozoa spines sternal sternum stomach structure substance surface swimmerets telson tergal tergum terminal thoracic thoracic limbs thoracic somite tion tissue transverse wall yelk zone