67 



11. Bairdia inflata (Norman). 



(PL XXX, fig. 2) 



Cythere inflata, Norman, Species of Ostraeoda new to Britain. Ann. Mag. Nat. Hist. Vol. IX, 



p. 49, PI. Ill, figs. 68. 



Syn: Bairdia obliqaata, G. O. Sars. 

 , subdeltoidea, White (not Minister). 



Specific Characters. Female. Shell very tumid, seen laterally, oval 

 rhomboid in outline, greatest height about in the middle and somewhat exceeding 

 half the length, dorsal margin boldly arched and sloping rather steeply to the 

 hind corner of the shell, ventral margin nearly straight, anterior extremity obli- 

 quely truncated, projecting above in an obtuse corner, posterior extremity 

 somewhat exerted below, but obtuse at the end; seen dorsally, broadly ovate 

 in outline, greatest width about in the middle and considerably exceeding half 

 the length, both extremities sharply pointed. Valves conspicuously unequal, 

 the left one overlapping the right considerably in the middle of the dorsal face, 

 hind edge of each valve irregularly dentated below; surface smooth, but of a 

 somewhat dull appearance from numerous small impressed pits. 



Colour not yet ascertained. 



Length of adult female 1.12 mm, 



Male unknown. 



Remarks. This form was originally described in the year 1862 by Norman 

 as a species of the genus Cythere, and was subsequently erroneously identified 

 by White with the fossil species, B. subdeltoidea (Mtinster). Nor can the 

 Mediterranean form described in detail by the present author under the latter 

 name be adduced to that species, but may more probably be identical with 

 one of the 10 closely allied species recorded by G. W. Muller from the gulf of 

 Naples. As pointed out by Brady, the B. obliqvata of the present author is 

 identical with Norman's species. 



Occurrence. My knowledge to this form is confined to the examination 

 of 2 empty valves probably of the same specimen, found by my late father in 

 shell-sand from 0xfjord, on the Finmark coast. Norman has however recorded 

 this form from 3 localities on the west coast of Norway, and I have had an 

 opportunity of seing some of his specimens. 



Distribution. British Isles (Brady), Fosse de Cap Breton (Marquis de Folin). 



Fossil in post-tertiary deposits of Scotland. 



