88 MODERN SYSTEM. 



Division II. — Sliell rostrated in front. Eight hinder legs alike, and simple. 

 Fam. VI. — Maiad^. Leach. 

 Subdivision 1. — Fingers dejicxed. 

 Genus 11. EURYNOME. Leach. 

 External antoince rather long, with the first joint shorter than the se- 

 cond : shell verrucated, anteriorly terminated by a bitid rostrum with 

 divaricating lacinitE : eijes 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-emarginate : an- 

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

 the female, longer than the body. 

 Sp. 1. Eur. aspera. 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- 

 mellce; rostrum v.-ith simple acuminate laciniffi. 

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

 Enc)/cl. vii. 431. — Maluc.Fodvph. Brit. tab. 17. — Trans. Linn. Soc. xi. 

 326. 

 Inhabits the British seas. 



Subdivision 2. — Fingers not dejlexed. External antenna zcith tlte first 

 joint simple. Anterior pair of legs distinctly thicker than the rest. 

 Genus 12. PISA. Leach. Blastus. Leach, Edin. Enci/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 apex triuicate or emarginate: dazes internally 

 denticulated: sAt// villose; the lacinia? of the rostrum divai-icating : 

 orbits behind with two, below with one fissure. 



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

 a spine. 

 Sp. 1. Fisa Gibhsii. Rostrum descending: shell with a spine behind 



the eyes on each side ; arms and thighs simple. 

 Cancer biaculeatus. Montagu, Trans. Linn. Soc. xi. 2. f. 1. f. 1. Pisa 

 biaculeata. Leach, Edin. Encycl. vii. 431. I'isa Gibbsii. Leach, 

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

 Inhabits deep waters on the coasts of Devon and Cornwall, 



** Shell villose, zcith spiny sides. 

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



the rest larger. 

 Cancer tetraodon. Fenn. Brit. Zool. iv. 7. t. o.f. 1.5. Maja tetraodon. 



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



Encycl. vii. 131. Pisa tetraodon. Leach, Trails. Linn, Soc. — Supp. to 



Encycl. Brit. I. 415.— Mai. Fodoph. Brit. tab. 20. 

 Inhabits the south-west coast of England. 



