240 MARINE INVERTEBRATES 
Order DECAPODA 
(Thoracic segments unite with head and form cephalothorax, which is covered by 
carapace; eyes stalked ; maxillipeds have exopodites ; sive pairs 
of walking-feet without exopodites ) 
Suborders 
MACRURA 
(Abdomen usually longer 
than cephalothorax and 
commonly extended ; ros- 
trum usually prominent ; 
eyes not inclosed in orbits ; 
antenne and antennules 
large; antennce have exo- 
podites) 
Genera 
Penceus 
Free-swimming Forms: 
Shrimps and Prawns Paleemonetes 
Crangon 
Creeping Forms: Homarus 
Lobsters and Crawfish Families , 
asTAcoIDz ) Panulirus 
Scyllarus 
Anomalous Forms: 
Approaching the Brachyura 
ANOMURA 
DROMIDAZA Hippoconcha 
Pagurus 
PAGURIDA 
Clibanarius 
Pylopagurus 
CENOBITIDZ Cenobita 
HIPPIDA Hippa 
Albunea 
Porcellana 
PORCELLANIDZ A 
Petrolisthes 
Lithodes 
Echidnocerus 
LITHODID : 
(Fifth pair of feet foldea \ Acantholithodes 
under the carapace) Cryptolithodes 
Phyllolithodes 
Species 
P. setiferus 
} P. brasiliensis 
P. vulgaris 
Cc. vulgaris 
; C. franciscorum 
HA. americanus 
P. interruptus 
; P. argus 
A arcuata 
P. bernhardus 
P. pollicaris 
P. longicarpus 
C. vittatus 
C. diogenes 
HH. talpoida 
} HT. analoga 
A, gibbesit 
P. sayana a 
; P. sexspinosus 
P. armatus 
L.maia 
; E. cibarius 
EF. foriminatus 
A, hispidus 
C. sitchensis 
P. papillosus 
