CLASS I. CRUSTACEA. 81 



antl corallines, which fill the pools left by the liJe in most of the 



rocky coasts of Europe. 

 Sp. 1. Cj/th. viridis. Shell reniforni, velvety, and greeiy; 

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



Scotland amongst/«cJ and confervs. 



Division III. — Bvcly covered neither bi/ a bivalve shell nor shield. Ei/c one, 



sessile. 



Genus 8. CYCLOPS. Miill., Lam., Latr., Base, Leach. 



Body ovate-conic, elongate : et/e one, situate on the thorax : antenna 

 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 taiT. 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 antenna; 

 are hairy at the base of their joints. 



Sp. 1. Cj/c. Geo§)o)jii. Tail straight and bitid; colour brownish. 



Monoculus quadricornis. Linnc, Fabr. Cyclops quadricornis. M'vll., 

 Latr., Bosc. Cyclops Geoffroyii. Leach. 



Genus 9. POLYPHEMUS. MYdl., Latr., Bosc, Leach. Cephalo- 

 CULUS. Lainarck. 

 Eye one, forming the head : legs ten ; tv/o bifid, elongate, and extended 



horizontally. 

 Sp. 1. Fol. 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 : antemut 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 Linnean Society 

 of London, vol. i. 



