CRUSTACEANS 



vit/osa (Jurine) from Baslow. 1 In all these instances the discoverer was 

 Dr. G. S. Brady, M.D., F.R.S., who in his description of the last named 

 species gives ' outline, as seen from above, compressed, oval, pointed in 

 front and rounded behind ; about twice and a half as long as broad,' and 

 ' surface of the shell covered with long fine hairs'; 'colour light grass- 

 green.' a The narrowness of the form and the difference of hue are 

 good marks to distinguish this from the two species of the preceding 

 genus, but for distinguishing the three from all others that he may meet 

 with, the student will find it desirable to consider the full generic and 

 specific definitions and the figures supplied in the various memoirs cited 

 in the footnotes. 



The Copepoda, or oar-footed Entomostraca, are somewhat more 

 shrimp-like than the Ostracoda. It cannot be in the least rash to say 

 that they are plentiful in the county, but there are no printed references 

 available as a guarantee of the assertion, and the only ocular demonstra- 

 tion to which I can appeal depends upon two little specimens of a species 

 of Cyclops^ which Dr. H. Lyster Jameson kindly sent me ' from pool at 

 bottom of chasm, Speedwell Cave, Derbyshire.' In each instance the 

 pair of strongly geniculate first antennae show the specimen to be a male, 

 but the species remains for the present indeterminate. 



1 Irani. R. DubRn Six. ser. 2, iv. 90. 

 * Trans. Linn. Soc. (London, 1868), vol. xxvi. pt. 2, p. 377. 



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