A HISTORY OF NORFOLK 



stations. In this the shell seen from above is heart-shaped in the female, 

 broadly ovate in the male. The colour is green, w^ith irregular blotches 

 of darker green, or black. The length is half a millimetre, or one- 

 fiftieth of an inch.' As further especially characteristic of the East- 

 Anglian district, Brady and Robertson name Cythere fuscata, described 

 by Brady in 1868. It occurs in Horsey Mere, Hickling and Ormesby 

 broads, the Ouse and the Bure, and, according to Brady and Norman, 

 ' is confined to estuarine and brackish or sub-brackish situations in Hol- 

 land and the East of England.'^ 



The following species are also recorded definitely from Norfolk : 



Cyprinotus fretensis (Brady and Robertson), from Breydon Water and 

 Somerton Broad. Brady and Norman, in 1889, regard this, and also 

 Cypris salina (Brady), as synonyms of Cypris prasina (Fischer), taking 

 Brady's banded salina as the typical form of the species, fretensis as an 

 unhanded variety ; while of Fischer's prasina they remark that ' in 

 Fischer's description certain markings are noticed somewhat vaguely, 

 but are not given in the figures accompanying his memoir.' ' Professor 

 Sars, however, in 1890, upholds two species distinct from Fischer's as 

 Cyprinotus salina (Brady) and Cyprinotus fretensis (Brady and Robertson).* 

 Then, in 1896, Brady and Norman, after quoting from Sars a re-defini- 

 tion of Brady's Cyprinotus, perplexingly add, ' To the genus Cyprinotus, 

 thus defined, is probably referable the following : Cyprinotus prasinus (S. 

 Fischer) {= Cypris salina, Brady and Norman, pt. i. p. 78).* Salina must 

 be a slip of the pen for prasina, and the learned authors leave us in doubt 

 whether they now agree with Sars in making prasinus, salinus, iSi^ fre- 

 tensis three independent species, or with their former selves in uniting 

 them into one. 



Cypridopsis aculeata (O. G. Costa), from many of the broads of Nor- 

 folk and Suffolk. The specific name given by the Italian author was, 

 independently, some years later given to this species by the Swedish 

 author Lilljeborg.* That an aculeate shell should twice suggest the 

 name aculeata cannot be claimed as a miraculous coincidence. 



Pionocypris obesa (Brady and Robertson), from Norfolk broads and 

 the Ouse, near Lynn. The species was at first referred to Cypridopsis. 

 The new generic name given by Brady and Norman in 1896 signifies 

 the fat cypris. As obesity is more than hinted at in the specific name 

 also, it should be noted that it is only a tumid shell not a sebaceous 

 animal, on which these epithets are piled. It may be only a variety or a 

 synonym of Pionocypris vidua (Miiller), widely distributed in fresh water. 

 The ' widow ' {vidua) has coloured bands with which her ' fat friend ' 

 dispenses.' 



* Ann. Nat. Hist., ser. 6, vol. iv. pp. 5, 20, 30 ; Monograph, p. 123 (in almost all cases 

 the works here cited either supply or give references to plates in which the several species are 

 figured). 



2 Monograph, p. 148. ^ /^/^_ p_ ^g. 



* Oversigt af Norges Crustaceer, in Forh. Se/sk. Christian., 189O, p. 56. 



' Monograph, pt. ii. p. 722. ® Uid. pt. i. p. 90 ; pt. ii. p. 725. 



' Ibid. pt. i. p. 89 ; pt. ii. p. 726. 



194 



