^Mysis^ ^M. sternolepis^ ^Euphausia^ Order =DECAPODA= (/Thoracic segments unite with head and form cephalothorax, which is covered by carapace; eyes stalked; maxillipeds have exopodites; five pairs of walking-feet without exopodites/) Suborder ~MACRURA~ (/Abdomen usually longer than cephalothorax and commonly extended; rostrum usually prominent; eyes not inclosed in orbits; antennæ and antennules large; antennæ have exopodites/) Set Free-swimming Forms: Shrimps and Prawns ^Penæus^ ^P. setiferus^ ^P. brasiliensis^ ^Palæmonetes^ ^P. vulgaris^ ^Crangon^ ^C. vulgaris^ ^C. franciscorum^ Families Genera Species Set Creeping Forms: Lobsters and Crawfish ASTACOIDÆ ^Homarus^ ^H. americanus^ ^Panulirus^ ^P. interruptus^ ^P. argus^ ^Scyllarus^ Set Anomalous Forms: Approaching the Brachyura Suborder ~ANOMURA~ (Of these Families, the Lithodidæ have /Fifth pair of feet folded under the carapace/) DROMIDÆ ^Hippoconcha^ ^H. arcuata^ PAGURIDÆ ^Pagurus^ ^P. bernhardus^ ^P. pollicaris^ ^P. longicarpus^ ^Clibanarius^ ^C. vittatus^ ^Pylopagurus^ CENOBITIDÆ ^Cenobita^ ^C. diogenes^ HIPPIDÆ ^Hippa^ ^H. talpoida^ ^H. analoga^ ^Albunæa^ ^A. gibbesii^ PORCELLANIDÆ ^Porcellana^ ^P. sayana^ ^P. sexspinosus^ ^Petrolisthes^ ^P. armatus^ LITHODIDÆ ^Lithodes^ ^L. maia^ ^Echidnocerus^ ^E. cibarius^ ^E. foriminatus^ ^Acantholithodes^ ^A. hispidus^ ^Cryptolithodes^ ^C. sitchensis^ ^Phyllolithodes^ ^P. papillosus^