1910.] BRITISH SPECIES OF OSTRACODA. 211 



other Candoninre, are the atrophied posterior foot, and the 

 abnormal structure of the caudal rami, the terminal claws of which 

 differ in their comparative size from those of other species, the 

 uppermost of the two being much the larger, and the marginal 

 seta is closely approximated to the claws. 



In addition to the type species, I have recently detected in a 

 Scotch mounting kindly sent to me by my friend the Rev. Canon 

 Norman, a few specimens of another form distinct from >$. similis, 

 but undoubtedly belonging to the same genus : this I propose to 

 name S. normani. 



SlPHLOCANDONA NORMANI, Sp. D. (Plate XXVII. figs. 10-14.) 



Shell, seen laterally, compressed, oblong, siliquose (fig. 9), greatest 

 height situated in the middle, not nearly equal to half the length ; 

 extremities narrowly rounded, the posterior somewhat oblique ; 

 dorsal margin gently and evenly arched, ventral slightly prominent 

 in front, gently sinuated behind : seen from above (fig. 10), com- 

 pressed, subovate, greatest width equal to the height and situated 

 in the middle, gradually tapered to the extremities, which are 

 acuminate : surface of the shell smooth, colour milk-white. 

 Length - 8 mm. Claws of the caudal rami stout (fig. 14), the 

 uppermost more than twice as long as the lower ; the marginal 

 seta short, stout, and claw- like, closely approximated to the 

 terminal claws. 



The only specimens of this curious species which I have seen 

 were included in a series of Gandonopsis kingsleii, from which, 

 indeed, it was not very easy to distinguish them. They were 

 taken by the Rev. Canon Norman in pools near the margin of 

 Loch Fadd, Isle of Bute. 



Subfam. Heepetocypridin.e. 

 Genus Herpetocypris Brady & Norman. 

 Herpetocypris reptans Baird. 



1850. Candona reptans Baird, (7) p. 160, pi. xix. figs. 3, 3 a. 

 1889. Erpetocypris reptans Brady & Norman, (2) Part i. p. 84, 



pi. xiii. fig. 27. 

 1891. Cypris reptans Vavra, (6) p. 86, fig. 28. 1-5. 

 1900. Herpetocypris reptans Kaufmann, (4) p. 282, pi. xvi. 



figs. 1-3, pi. xviiL figs. 21-26. 

 1900. Cypris reptans G. W. Midler, (5) p. 58, pi. xiv. figs. 4, 6, 



12, 13, 17. 

 The most abundant and apparently the most widely distributed 

 species of this subfamily — found everywhere in Great Britain, in 

 Scandinavia, and all over the continent of Europe. 



Herpetocypris chevreuxii G. O. Sars. (Plate XXIX. figs. 1-7.) 



Stenocypris chevreuxii G. O. Sars, " On a new fresh- water 

 Ostracod, &c." (Archiv f. Mathem. og Naturvidenskab, 

 1896). 



Shell, seen laterally (fig. 1), oblong, of nearly equal height 



14* 



