AKTHKOPODA. 



Our common crab is Cancer pagurus [closely allied species aro 

 found in North and South America and in New Zealand] ; the 

 shore-crab, Carcinus mcenas; the spider crab or corwich, Maia 

 squinado ; the common land-crab, sold in the West-Indian mar- 

 kets, is Cardisoma guanhumi but there are other species known 

 as "land-crabs" belonging to Uca, Gecarcinus, &c. ; the lobster 

 is Homarus gammarus ; the crawfish of the west of England and 

 the London fishmongers is Palinurus vulgaris ["spiny lobster " 

 seems to be a mere book-name] ; the river crayfish, Astacus fluvia- 

 tilis; the shrimp, Crangon vulgaris; and the prawn, Palcemon 

 serratus. Two Mediterranean prawns are Pandalus narwal and 

 Pencsus caramote. 



MACRURA. Abdomen [or postabdomen] well- developed, the 

 first five segments becoming natatory limbs, the sixth segment 

 terminated in a five-parted tail-fin. 



Glaus heads Macrura with " Sergestidse " (including Leucifer\ 

 Diastylidae constituting the "suborder" Cumacea. Schmarda 

 begins with Diastylidas, Leucifer forming a pendant to Mysidte 

 and Sergestes ranking under Caridinidae (=Alpheidse). 



Diastylid<B. 



Leptocuma. 



Leucon. 



Cyrianassa. 



Eudora. 



Bodotria. 



Diasty lis = Cuma. 



Alpheus. 

 Caridina. 

 Pontonia. 

 Athanas. 



Stenopus. 

 Sicyonia. 

 Penaeus. 

 Pasiphasa. 



Pal&monida. 

 Hippolyte. 

 Palasmon (Prawn). 

 Pandalus. 



Cambarus. 

 Homarus. 

 Nephrops. 



Palinuridce. 

 Palinurus (Crawfish). 



Nica. Scyllarida. 



Lysmata Scyllarus. 



Crangon (Shrimp). Th e nu8- 



Thalassinidw. Ibacus. 



Axius. 

 Gebia. 

 Thakssina. 



GalatJidda. 

 Polycheles=Wille- 



moesia. 

 Grimothea. 

 AstacidcB. Galathea. 



Astacus (Kiver Cray- Munida. 

 fish). *Eryon. 



ANOMURA. Abdomen slightly developed, except in Paguridse, 

 and without a tail-fin. 



In this purely artificial division the two families Paguridae and 



