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255 
gated with patches of a darker shade. The pediform antenne are 
provided with about six bristles of considerable length. 
Hab. Freshwater ponds, Coquimbo ; collected by — Donnet, Esq., 
Surgeon R.N. Brit. Mus. ; from the collection of H. Cuming, Esq. 
2. Cypris cungata, Baird. (Pl. XVIII. f. 22-24.) 
Carapace valves wedge-shaped, much broader at anterior than poste- 
rior extremity. Dorsal margin highly arched ; ventral deeply sinuated 
in the centre, giving the shell a reniform appearance. Valves very 
convex in the centre, and surrounded by a prominent margin, which 
at the anterior extremity, when highly magnified, is seen to be mi- 
nutely and finely serrated. The whole carapace is of a deep green 
colour, and covered with fine hairs. 
Hab. Duddingston Loch, near Edinburgh; August 1850. 
Genus Cannon, Baird. 
1. Canpona tacTeEA, Baird. (Pl. XVIII. f. 25-27.) 
Carapace valves oblong ovate, convex. Dorsal margin nearly 
straight ; ventral slightly sinuated in the centre. Anterior and poste- 
rior extremities of nearly equal size. Surface of valves smooth and 
shining, and of a dull white colour. 
This species resembles in shape the Candona reptans, but is only 
about one-fourth the size, and is of a uniform dull white colour. 
Hab. Freshwater pond at Charing, Kent; collected by W. Harris, 
Esq., to whom I am indebted for specimens. Regent’s Park (7. Ru- 
_ pert Jones, Esq.). 
Genus CyTHereE, Miller. 
1, CyrHere TaRENTINA, Baird. (Pl. XVIII. f. 31-33.) 
Carapace valves obovate. Anterior extremity much broader than 
posterior, and having a broad flat margin striated on the surface 
and toothed round the edge; posterior extremity pointed, having the 
same margin, but not so broad, and with much fewer teeth. The 
valves are very convex in the middle, of a greyish colour, with a 
white patch in the centre, and are slightly pitted all over. Dorsal 
and ventral margins both somewhat prominent. 
Hab. Tarentum. In Mr. Williamson’s collection. 
2. Cyruere seTosa, Baird. (Pl. XVIII. f. 28-30.) 
Carapace valves oval. Anterior extremity narrower than poste- 
rior. Dorsal margin arched ; ventral sinuated about its anterior third. 
Surface of valves shining white, and studded all over with short stiff 
hairs. 
Hab. Moreton Bay, Australia, and Tenedos. Mr. Williamson’s 
collection. 
Genus CyTHEREIS, Jones. 
1. CyTHEREIS AUSTRALIS, Baird. (Pl. XVIII. f. 10-12.) 
Carapace valves somewhat quadrilateral. Dorsal and ventral mar- 
