198 POST-TERTIARY ENTOMOSTRACA. 



superior margin arched, inferior nearly straight. Seen from above, the outline is much 

 compressed, widest in the middle, pointed in front, and strongly mucronate behind, width 

 equal to scarcely more than one third of the length. End-view ovate, pointed above, 

 height much greater than the width. Shell-surface distinctly punctate ; central areola 

 black, saddle-shaped. Colour, golden yellow. 

 Length, ygth of an inch. 



Distribution. Recent. — Great Britain. 



Fossil. — Scotland : Raised beach at Oban. South Wales : Cardiff New Dock-basin. 

 Ireland : Belfast New Docks, Portrush. Norway. 



14. Cytherura producta, Brady. Plate XIII, figs. 30 — 33. 



1868. Cytheruea producta, Brady. Monog. Rec. Brit. Ostrac, p. 443, pi. xx.xii, 



figs. 60, 61. 



Carapace, seen from the side, elongated, anterior margin rounded above, obliquely 

 truncate below ; posterior produced into a long and sharp central beak ; superior 

 margin well arched and forming a continuous curve (steeper, however, in front than 

 behind) from the middle of the anterior margin to the extremity of the posterior beak ; 

 inferior margin nearly straight, subrectangular behind ; height equal to less than half 

 the length. Seen from above, the outline is subhexagonal, with produced strongly 

 mucronate extremities and nearly parallel sides, width equal to about half the length. 

 Surface of the shell more or less irregularly striated or vaguely reticulate, the ventral 

 surface longitudinally striated. Central areola broad, somewhat crescentic. The female 

 is more tumid and usually smoother than the male. 

 Length, -^th of an inch. 



Distribution. Becent. — Great Britain, Ireland. 



Fossil. — South Wales -. Cardiff New Dock-basin. 



15. C-YTHERURA GiBBA {illuller) . Plate XIII, figs. 26—29. 



1785. Cytheke GIBBA, Mutter. Eiitomostraca, p. 24, pi. vii, figs. 10 — 12. 



— GiBBEBA, idem, ibidem (Mas) ; Lilljeborg, De Criistaceis, (1853), 



p. 167, pi. xix, figs. 1, 2. 

 1854. — GIBBA, Zenker. Anat. Studien iiber die Krebsth., p. 84, pi. v, u. 



1865. Cytherura gibba, G. O. Sars. Overs. Norg. mar. Ostrac., p. 70. 

 1868. — — Brady. Monog. Rec. Brit. Ostr., p. 444, pi. xxxii, figs. 



68—70. 



