88 MODERN SYSTEM. 



Division 11.— Shell rostrated in front. Eight hinder legs alike, and simple. 

 Fam, VI. — Maiad.^. Leach. 

 Subdivision 1. — Fingers dcjlexcd. 

 Genus 11. EURYNOME. Leach. 



External antenna ratlier long, witli the first joint shorter than the se- 

 cond: a/r// verrucaled, anteriorly terminated by a bifid rostrum wiili 

 divaricating laciniiE: ei/es distant, thicker than their peduncle which 

 is of moderate length: external double palpi with the interior point of 

 the second joint of their internal footstalks truncate-emarginale : an- 

 terior legs equal ; of the male, three times the length of the body ; of 

 the female, longer than the body. 



Sp. 1. Eur.uspera. Anterior legs and thighs tuberculated : shell with 

 eight tubercles on the back that are more elevated than the others, 

 which are irregular and margined with hairs; the sides with four la- 

 meiiffi; rostrum with simple acuminate lacinia-. 



Cancer aspera. Penn. Brit. Zool. iv. 8. Eurynome aspera. Leach, Edin. 

 Enci/cl. vii. 431.— Malac.Pod^ph. Brit. tab. 17. — Trans. Linn. Sac. .\i. 



Inhabits the British seas. 



Subdivision 2. — Fingers not dejlexcd. External antenna with the first 

 joint simple. Anterior pair of legs distinct h/ thicker than the rest. 

 Genus 12. PISA. Ixach. Blastvs. Leach, Edin. Enn/cl. 

 External antenna with clubbed hairs, the first joint longer than the se- 

 cond : external double palpi with the second joint of the internal foot- 

 stalk with its internal ape.x truncate or emarginate: clans internally 

 denticulated: s/jc// villose; the lacinitt of the rostrum divaricating: 

 orbits behind with tivo, below with one fissure. 



* Shell densely villose, the sides on each side behind terminated with 

 u spine. 

 Sp. 1. Fisa Gibbsii. Rostrinn descending: shell with a spine behind 



the eyes on each side ; arms and thighs simple. 

 Cancer biaculeatus. Montagu, Trans. Linn. Soc. .\i. 2. ^ 1. f. i. Pisa 



biaculeata. Leach, Edin. Encj/cl. vii. 431. Pisa Gibbsii. Leech, 



Linn. Trans, xi. .327. — Mai. Fodoph. Brit. tab. 19. 

 Inhabits deep waters on the coasts of Devon and Cornwall. 



** Shell villose, rrith spiny sides. 

 Sp. 2. Fisa tetraodon. Shell on each side with six spines; tivo small. 



the rest larger. 

 Cancer tetraodon. Penn. Brit. Zool. iv. 7. t. 8./. 1.5. Maja tetraodon, 



Bosc, Hist. Nat. des Crust. 1. 254. Blastus tetraodon. Leech, Edin. 



Encj/cl. vii. 431. Pisa tetraodon. Leach, Trans. Linn. Soc. —Supp. to 



Enrycl. Brit. i. 415.— il/«/. Fodoph. Brit. tab. 20. 

 Inl abils the south-west coast of England. 



