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 CRUSTACEANS Notodromas monacha (Miiller), from Somerton Broad.* Candona Candida (Miiller), from Wroxham Broad, and other loca- lities.^ 'The ordinary form of C. Candida occurs commonly in ponds and ditches ; the variety tumida is most common in rivers and dykes subject to tidal influences, and in the fen district of Norfolk and Suffolk.' ' Candona lactea, Baird, from Norfolk broads and other waters,* This is described as resembling the young of C. Candida with the difference that the latter is obliquely rounded behind, while lactea is evenly rounded at both ends." Candona compressa (Koch), from the Norfolk broads. Like some others already mentioned, this species will illustrate the difficulties of identification that sometimes occur in this group of numerous, small and closely-related forms. Brady and Robertson, in 1870,* record two species, C. albicans, Brady, and C. compressa (Koch), which Brady and Norman, in 1889,' unite under the name C. pubescens (Koch) but in 1896* the latter authors accept the title C. compressa (Koch) in place of their C. pubescens from Norfolk, leaving the true C. pubescens to Essex and Bedfordshire. Candona fabceformis (Fischer), from Ormesby Broad. A form which was named C. diaphana by Brady and Robertson is made a synonym of this ' bean-shaped ' Candona by Brady and Norman.* Candona hyalina, Brady and Robertson, from Barton Broad, and perhaps also from Wroxham and Ormesby broads.*" Candona acuminata (Fischer), from Hickling Broad." Candonopsis kingsleii (Brady and Robertson), from the Norfolk broads. This species was transferred from Candona to a new genus, Candonopsis, by the Bohemian author Vavra, in 1891.*^ Argillcecia cylindrica, G. O. Sars, from the Norfolk Ouse.*^ Cythere pellucida, Baird, Brady and Norman say : ' This is essentially a brackish water species, and is found all round the coasts of Great Britain and Ireland in salt marshes and estuaries, and in rivers as far as, or even further than, the tidal influence extends. We have found it in places as far inland as Whittlesea, and in several of the Norfolk and Suffolk broads. It occurs also not uncommonly in dredgings from shallow water up to 4 or 5 fath., and less commonly up to 30 fath."* Cythere confusa, Brady and Norman, from Breydon Water, Norfolk, and from the rivers Ouse alike of Norfolk and Yorkshire. Brady and Norman speak of it as more strictly a marine species than C. pellucida, and not so universally found in tidal or brackish waters, but more abundantly in deep water all round our coasts.*" ^ Monograph, pt. i. p. lOO. * Ann. Nat. Hist., ser. 4, vol. vi. p. 30. '' Monograph, pt. i. p. lOi. * Ibid. pt. ii. p. 728. * Ibid. pt. i. p. 103. '" Ann. Nat. Hist., ser. 4, vol. vi. p. 18 ; Monograph, pt. i. p. 247. " Monograph, pt. i. p. 104. '^ Ibid. pt. i. p. 102 ; pt. ii. pp. 720, 731, 743. " Ibid. pt. i. p. III. " Ibid. p. 126. " Ibid. p. 127. 195
 * Monograph, pt. i. p. 96. ^ Ann. Nat. Hist., ser. 4, vol. vi. p. 16.
 * Monograph, pt. i. p. 99. * Ann. Nat. HUt., ser. 4, vol. vi. p. 30.