CLASS I. CRUSTACEA. 81 



and corallines, which fill the pouls left by the tide in most of the 



rocky coasts of Europe. 

 Sp. 1. Ci;th. viridis. Shell reniform, velvet\% and green. 

 Inhabits the European ocean. Is occasionally found on the shores of 



Scotland amongstjHci and conferv(£. 



Division III. — BoiJif covered neither hy a bivalve shell nor shield. Etje one, 



sessile. 



Genus 8. CYCLOPS. Mull., Lam., Latr., Bosc, Leach. 



Body ovate-conic, elongate : eye one, situate on the thorax : anlenn(E 

 four, simple : legs eight. 



All the animals of this genus inhabit fresh waters. The females 

 carry their eggs in a pouch resembling a bunch of grapes on each 

 side of the tail. The organs of generation of the male are placed in 

 the antennae; those of the female, beneath the belly, at the base of 

 the tail, which is abruptly narrower than the abdomen. The antennte 

 are hairj^ at the base of their joints. 



Sp. 1. Cyc. Geoffroyii. Tail straight and bifid; colour brownish. 



I\Ionoculus quadricornis. Linne, Fair. Cjxlops quadricornis. Mull., 

 Latr., Bosc. Cyclops GeoftVoyii. Leach. 



Genus 9. POLYPHEMUS. Mull., Latr., Bosc, Leach. Cepiialo- 

 cuLUs. Lamarck. 

 £;/eone, forming the head : legs ten; two bifid, elongate, and extended 

 . horizontally. 

 Sp. 1. Pol. Oculus. Body luteous, with a few blue spots. 



The only species known of this genus. It inhabits lakes and 

 marshes; and is subject to very considerable variation in size and 

 colour. 



Division IV. — Body covered by neither a bivalve shell nor shield. Eyes 

 pedunculated. 



Genus 10. BRANCHIOPODA. Lam., Latr., Bosc, Leach. 



Body filiform and very soft: head divided from the thorax by a very 

 narrow but distinct neck : eyes two, lateral : antennm two, short, two- 

 jointed, capillary, inserted behind and above the eyes: front with two 

 moveable processes (which are broader towards the apex in the male 

 sex), that are notched, those of the female furnished with a papilla at 

 their point. The organs of generation are situate at the base of the 

 tail. 



Sp. 1. Br. stagnalis. Body transparent, of a light brown colour, slightly 

 tinged with green or blue, particularly on the head and legs. 



Cancer stagnalis. Linne. — An interesting account of this species is 

 given by the late Dr. Shaw in the Transactions of the Lin/wan Society 

 of London, vol. i. 



