148 



POST-TERTIARY ENTOMOSTRACA. 



9. Cythere lutea, Miiller. Plate III, figs. 1 — 6. 



1/85. Cytheee LUTEA, il/wZ/er. Entomostraca, p. 65, tab. vii, figs. 3, 4. 



1850. — RENiFORMis, 5ai>rf. Brit. Entom., p. 169, tab, XX, figs. 5, 5 a-/. 



1854. — 1UTEA-, Zenker. Ueber die Krebsthiere, p. 83, tab. v, C. 



1865. — — G. O. Sars. Oversigt af Norges marine Ostracoder, p. 28. 



1865. — SETOSA, Brady. On new or imperfectly known Ostracoda (Trans. 



Zool. Soc. London), p. 372, pi. Iviii, figs. 12, 



13, 15 a. 



1868. — LUTE A, Brady. Monograph of Recent British Ostracoda, p. 395, 



pi. xxviii, figs. 47 — 56 ; pi. xxxix, fig. 2. 



Carapace of the female, as seen from the side, reniform, highest in the middle, greatest 

 height equal to much more than half the length ; extremities obtusely rounded, dorsal 

 margin well arched, ventral distinctly sinuated in front of the middle. Outline, as seen 

 from above, oblong-ovate, widest behind the middle, greatest width equal to less than half 

 the length, obtusely pointed in front, broader behind, the hinge-line marked by a deep, 

 sharply-cut sulcus. End view ovate, centrally emarginate above, keeled below. Valves 

 dissimilar in shape, the right higher than the left ; its extremities more obhquely truncate. 

 Anterior and ventral borders of the carapace compressed and marked with radiating 

 transverse hair-like lines ; central portions covered with a calcareous crust which is 

 marked with distant circular pits, and dotted in the interspaces with numerous small 

 punctures. Hinge-teeth feebly developed, crenulated. Shell of the male much more 

 elongated and more angular in outline, inferior margin more deeply sinuated, surface 

 usually more or less waved or ribbed in a sub-radiate manner. 

 Length ^th of an inch. 



This species is found living abundantly in the seas of Britain and Scandinavia, 

 mostly in the littoral and laminarian zones ; it is also one of the most abundant Post- 

 tertiary fossil species. The shell of the female sometimes nearly approaches in appear- 

 ance the female C. villosa, but a close examination especially of the hinge-joints will 

 always remove any doubt respecting it. 



Distribution. Eecent. — Baffin's Bay, Iceland, Gulf of St. Lawrence, North Sea, Great 

 Britain, Ireland, Baltic, Mediterranean. 



Fossil. — Common in nearly all the beds of the west of Scotland, but less frequent on 

 the east. Ireland : Belfast New Docks, Portrush. Canada and Norway, Post-tertiary 

 beds. 



