168 POST-TERTIARY ENTOMOSTRACA. 



and fang-like ; the posterior broad and obliquely truncate. The shell of the male is, as 

 usual, more compressed and elongated. 

 Length, a^nd of an inch. 



Distribution. Recent. — Scotland, Spitzbergen. 



Fossil. — England : Bridlington. Scotland : Barrie, Elie, Dryleys, Errol, Wick. 



36. Cythere Hoptonensis, nov. sp. Plate XIV, figs. 4 — 6. 



Left valve, as seen from the side, subquadrangular, oblong, greatest height situated 

 over the anterior hinge-tubercle, and equal to nearly two thirds of the length ; anterior 

 extremity obliquely rounded ; posterior subtruncate, prominent and rounded below the 

 middle; superior margin sloping from before backwards and distinctly excavated 

 towards each extremity ; inferior nearly straight ; seen from above, the outline is irregularly 

 ovate, with broadly and obtusely mucronate extremities. The outline of the right valve 

 presents an evenly arched, though flattened dorsal margin, the lower angle of the 

 posterior margin being also much more distinctly produced. The surface of the shell is 

 covered with rather sharp and irregularly convoluted ridges, and with distinct crests 

 running parallel to the anterior and lower borders. 

 Length, aV'^ of an inch. 



Distribution, /o55^7. — England: Hopton Cliff. 



37. Cythere Dunelmensis {Norman). Plate V, figs. 13 — 20 ; Plate XI, figs. 36, 37. 



1865. Cytheeeis Dunelmensis, iiorman. Nat. Hist. Trans. Northumberland and 



Durham, vol. i, p. 22, pi. vii, figs. 

 1—4. 



1865. — HOBRiDA, G. O. Sars. Overs. Norg. mar. Ostrac, p. 45. 



1868. Cythere Dunelmensis, Brady. Monog. Rec. Brit. Ostrac, p. 416, pi. xxx, 



figs. 1—12. 



Carapace of \hQ female, as seen from the side, subquadrangular, greatest height equal 

 to more than half the length, and situated over the arterior hinge. Anterior extremity 

 broadly rounded ; posterior somewhat narrower and rectangularly truncate ; superior 

 margin nearly straight, highest in front ; inferior slightly sinuated, the whole circum- 

 ference being much jagged and spinous. Outline, as seen from above, ovate, extremities 



