196 POST-TERTIARY ENTOMOSTRACA. 



distinct longitudinal grooves, each of which is mostly impressed with a single series of 

 round punctures. 



Length, -^th of an inch. 



C. striata also is very variable in the amount of its shell-sculpture. 



Distribution. Recent. — Norway, Great Britain, Ireland. 



Fossil. — Scotland : Loch Gilp, West Tarbert, Kyles of Bute, Cuinbrae, Cartsdyke, 

 West Tarbert. South Wales : New Dock basin at Cardiff. Ireland : New Docks at 

 Belfast. Norway and Canada. 



10. Cytherura quadrata, Norman. Plate XIII, figs. 34, 35. 



1868. Cytheruka quadeata, Norman, Last Report on Dredging amongst the 



Shetland Islands, p. 292. 



Shell, seen from the side, subquadrangular, of nearly equal height throughout, height 

 equal to half the length, rounded in front, produced behind into a sharp median beak ; 

 superior margin forming a flattened arch ; inferior almost straight ; seen from above, the 

 greatest width is situated rather in front of the middle, the outline being subhexagonal. 

 The surface-sculpture is very similar to that of C. striata, consisting of flexuous longi- 

 tudinal striae, the hollows of which are marked with more or less circular pittings ; just 

 within the ventral margin is a ridge, terminating in front in a small angular alseform 

 projection. 



Length, ^th of an inch. 



This species differs from C. striata in its greater proportionate height and width, and 

 in having its greatest width, when viewed from above, situated towards the anterior 

 extremity, a peculiarity which it shares, so far as we know, only with C. affinis. We 

 have seen only a very few detached valves. 



Distribution. Recent. — Shetland, South Wales. 



Fossil. — South Wales : Cardiff" New Dock basin. Ireland : Belfast New Docks. 



11. Cytherura cuneata, Brady. Plate XIII, figs. 36, 37 ; Plate XI, figs. 42 and 47. 



1868. Cytherura cuneata, Brady. Monog. Rec. Brit. Ostrac, p. 442, pi. xxxii, 



figs. 35—38, 63. 



Carapace of female, seen from the side, elongated, subquadrangular, nearly equal in 

 height throughout, height scarcely equal to one half the length ; rounded in front, pro- 



