1910.] BRITISH SPECIES OF OSTRACODA. 203 



Candona stagnalis G. 0. Sars. (Plate XXII. figs. 11, 12.) 



1890. Candona stagnalis G. 0. Sars, " Oversigt af Norges 



Crustaceer, ii.," p. 69. 



1891. Candona ambigua T. Scott, "Invertebrate Fauna of 



Inland Waters of Scotland " (Ninth Annual Report, 

 Fishery Board for Scotland) p. 277, pi. iv. tigs. 7 a-c. 

 1896. Candona stagnalis Brady ife Norman, (2) Part ii. p. 729, 



pi. lxviii. figs. 14-17. 

 The only known British localities for this species are Lochgelly 

 Loch and Loch Fitty, Fifeshire, where it was taken by Dr. T 

 Scott. I have nothing to add to what has already been published 

 respecting it. 



Candona caledonle, sp. n. (Plate XXIII. figs. 9-14.) 



Female. — Shell seen laterally oblong, subovate, greatest height 

 situa/ted in the middle and equal to half the length ; extremities 

 well rounded, the anterior the wider and more obtuse of the two 

 (tig. 9) : dorsal margin forming an even and somewhat flattened 

 arch, ventral very slightly sinuatecl in the middle : seen from 

 above (fig 10) the outline is much compressed, tapering gently to 

 the anterior extremity, rounded behind, the right valve slightly 

 smaller than the left, width equal to one third of the length ; 

 hinge-margins depressed in the middle, forming a well-marked, 

 shallow groove. Shell thin, structureless, showing no surface- 

 markings whatever, mottled yellow, the colour partly dependent 

 on the contained animal. Length 0*88 mm. 



Posterior antennae devoid of any setose fascicle ; the last two 

 joints bearing a few stout, claw-like setae (fig. 11); no sensory 

 setae. The mandible-palp is stout, the terminal joints short, 

 bearing a small branchial plate at the base (fig 12) ; last pair of feet 

 (fig. 13 ) bearing a very small forcipate process on the minute apical 

 joint, also two setae of unequal length ; the long penultimate joint 

 has two marginal setae. Caudal rami (fig. 14) straight, slender, 

 bearing two stout, perfectly smooth terminal claws, the dorsal 

 one considerably in front of the other ; seta of the dorsal margin 

 very short, distant from the apex about one third of the length of 

 the limb. 



Examples of this species have been in my collection for many 

 years, but have hitherto been erroneously identified with 

 Candonopsis kingsleii. A re -examination of the contained 

 animal shows, however, that it has none of the distinctive generic 

 characters of Candonojysis, nor can I assign it to any known 

 species of Candona. Its nearest ally is probably Candona 

 stagnalis G. O. Sars, from which, however, it differs in the non- 

 flattened dorsal margin of the valves, in the absence of pitted 

 shell-structure, in the elongated, quite straight caudal rami, the 

 claws of which are distantly apart and devoid of marginal setae. — • 

 My figures of the shell and caudal ramus of C. stagnalis are drawn 

 from Norwegian specimens kindly sent to me by Professor Sars, 



