164 POST-TERTIARY ENTOMOSTRACA. 



original account given by G. 0. Sars. Our figure, however, is copied accurately from the 

 Hopton Cliff specimen. 



Judging from the carefully drawn figures of Dr. Speyer, which, though too small, 

 ofiFer a delightful contrast to the almost useless illustrations of fossil Ostracoda usually 

 produced in Germany, we have no doubt that his Cythere latimarginata really refers to 

 the species better known to us by the more recent description (from the living animal) 

 of Sars under the name ahysdcola. On the ground of priority, however, we here adopt 

 Speyer's specific name. 



Distribution. Becent. — Norway and Shetland. 



Fossil. — England : Hopton CHfF. Germany : Middle Tertiary, Cassel. 



31. Cytheke tuberculata {G. 0. Sars). Plate V, figs 7 — 12. 



1865. Cythereis tuberculata, G. O. Sars. Overs. Norg. mar. Ostrac, p. 37. 



1865. Cythere mutabilis, clathrata, var. lybata, et ? var. latimarginata, 

 Brady. Trans, Zool. Soc, p. 377, pi. Hx, figs. 12, 13, 14. 



1868. — TUBERCULATA, Brady. Monog. Eec. Brit. Ostrac, p. 406, pi. xxx, 



figs. 25 — 41 (not Cytherideis tuberculata 

 of Jones, Monog. Tert. Entom., p. 47). 



Carapace of ihe female, as seen from the side, oblong, sub quadrangular or subovate, 

 highest over the anterior hinge ; greatest height equal to rather more than half the length. 

 Anterior extremity broad, obliquely rounded, and fringed on its lower half with a 

 series of (12 — 20) short equal teeth; posterior extremity narrower, evenly rounded and 

 bearing usually near the lower angle four, five, or six teeth rather larger than, but of 

 similar character to, those on the anterior margin. Superior margin sinuated- behind the 

 anterior hinge, thence sloping backwards with an irregularly sinuous (or sometimes twice 

 or thrice sharply emarginate) curve ; inferior margin gently sinuated in the middle. Out- 

 line, as seen from above, ovate, widest in the middle, extremities evenly and somewhat 

 obtusely pointed, margins irregularly sinuous, width scarcely equalling half the length. 

 End-view irregularly and broadly ovate, height not much exceeding the width. Carapace 

 of the tnale (fig. 11) much narrower and more elongated, dorsal margin more conspicuously 

 angulated at each extremity, ventral margin more deeply sinuated. Surface of the shell 

 marked throughout with large, deep, irregularly shaped pittings, the interspaces of which 

 often bear a few scattered setiferous papillae, bearing also three more or less conspicuous 

 eminences, one rounded and situated near the middle, the others elongated and occupying 

 the posterior third of the valve ; these, especially the two posterior, are often almost 

 obsolete. 



Length, -g^th of an inch. 



