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. 96. ^ Ann. Nat. Hist., ser. 4, vol. vi. p. 16. 



* Monograph, pt. i. p. 99. * Ann. Nat. HUt., ser. 4, vol. vi. p. 30. 

 ^ 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. 



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