Deccipoda — Macrura. 55 
under the name of “ Dublin Prawn,” although the chief supplies 
now come from Scotland and the North-East of England, not, as 
formerly, from the Irish Sea. In connection with the name 
“ Norway Lobster ” used for this species, it should be remembered 
that the common Lobster is abundant on the coasts of Norway, 
and that large quantities are exported thence to England. 
In the true Crayfishes, which belong to two families inhabiting 
respectively the fresh waters of the Northern and Southern Ilemi- 
Fig. 35. 
Astacopsis franklinii, about ^-th natural size. [Wall-case No. 5.] 
spheres, the last thoracic sternite is movable. In the Northern 
Crayfishes, belonging to the family Astaciclae, the male has sexual 
appendages on the abdomen. 
The largest of the Crayfishes found in Western Europe, and 
the most highly esteemed for food, is the “ Red-clawed Crayfish,” 
Astacus fluviatilis (French, “ Ecrevisse a pattes rouges,” German, 
“ Edelkrebs ”), found in France, Germany, Austria, N.W. Russia, 
S. Sweden, Denmark, &c. Although the name A. fluviatilis is 
sometimes applied to the English Crayfish, it is more correctly 
restricted to the Red-clawed species, which does not occur in the 
British Islands. 
Table-ease 
No. 10. 
