^2 MOUEll^' SVSTEiM. 



considerable dimeusioiis. The abdomen is naked and slender, being 

 covered merely wiliia skin of a delicate texture; but its extremity is 

 furnished with appendages, by means of which it secures itself within 

 tlie shell el' which it makes choice. It is really astonishing with 

 v'hat facility these animals move, bearing at the same time the shell, 

 \vhich is destined to preserve the botly from injury and to guard them 

 from the attacks of fishes, which would otherwise devour them. All 

 the species are termed indiscriminately Soldier-crabs and Hermit- 

 crabs, from the idea of their living in a tent, or retiring to a cell. 



Sp. 1. JPag. S(reblmi/x (common Soldier-crab). Arms hairy, muricated, 

 the left largest; hands subcordate, fingers broad. 



Cancer Bernhardus of Pennant and other English authors. Pagurus Stre- 

 blonyx. Mai. Fodoph. Brit. tab. 26. Jig. 1^-4:. 



Inhabits the European ocean, and is very abundant in the British seas, 

 inhabiting various kinds of univalve shells, changing its habitation 

 as it grows. Pagurus araneiformisj Edinb. Enci/cl. wil. 396, is merely 

 the young of this species. 



Division II. — Tail on each side tfith foliaceous appendages, forming witli^ 

 the middle tail-process a fan-like fin. 

 a. Interior antenne with very long footstalks. 



Fam. II. Palinurid.t. Leach. 

 External antenn<£ setaceous, and very long: legs ten, alike and simple. 

 Genus 20. PALINURUS. Dald., Fabr., Lam., Lair., Bosc, Leach. 

 The animals of this genus have the powder of producing a sound 

 by rubbing their exterior antennas against the sides of the projecting 

 clypeus. 

 Sp. 1. Pal. vulgaris. 

 Astacus homarus. Pcnn. Brit. Zool.'w. IG.pl.'il. Leach, Mai. Podoph. 



Brit. lab. 30. 

 Inhabits the European ocean. It is commonly eaten in London, and is 

 sometimes denominated Spiny-lobster or Sea Cray-fish. 



Fam. III. Galatead^. 



External antenna-- very long and setaceous : legs fen, anterior pair didac- 

 tyle, fifth pair spurious. 



Genus 21. PORCELLANA. Lam., Latr.,Bosc, Leach. 



External doable palpi with the first joint of the internal footstalk di- 

 lated internally : shell orbiculate subquadrate. 



Sp. 1. For. plati/chclcs. Anterior margin of the shell with three entire 

 teeth : claws very large and nuich depressed : wrists internally den- 

 ticulated ; hands externally deeply ciliated. 



Cancer platychcles. Penn. Brit. Zool.'w. 6. pl.6. & 12. Porcellana pla- 

 tychcles. Latr. Leach, Edin. Encycl. vii. 



