162 



POST-TERTIARY ENTOMOSTRACA. 



Carapace, as seen from the side, oblong, quadrangular, or subcuneate, highest in front, 

 height equal to about half the length. Anterior extremity obliquely rounded, often 

 bearing a row of from eight to twelve small teeth ; posterior extremity narrowed, angular, 

 excavated above and considerably produced below, where it is generally armed with about 

 four sharp spines : inferior margin straight or slightly convex ; superior elevated over 

 the anterior hinge, thence sloping backwards. Seen from above, oblong-ovate or 

 hastate, greatest width situated behind the middle and equal to less than half the length, 

 the junction of the hinge-margins marked behind the middle by a deep, sharply defined 

 sulcus ; ventral surface depressed along the whole length of the contact-margins, which 

 are bordered by a broad, well defined, smooth band. Surface of the shell marked with 

 oblong punctures, which are arranged chiefly in longitudinal rows, but around the 

 anterior border in curved lines. The valves are usually swollen behind, forming an 

 abrupt angular elevation, from which a longitudinal rib runs directly forwards, and two 

 others in an oblique direction towards the upper and lower margins. Left valve 

 considerably smaller than the right. 



Length, -^rd of an inch. 



We have met with only one fossil specimen of this species, and from it our figure is 

 taken ; but, as this carapace is by no means well characterized, our description is taken 

 from recent specimens. 



Distribution. Becent. — Great Britain, L'eland, Bay of Biscay. 



Fossil. — Scotland: Loch Gilp. 



29. Cythere angulata {G. 0. Sars). Plate IV, figs. 17—24; and Plate X, fig. 22. 



1865. Cythereis angulata, G. O. Sars. Overs. Norg. mar. Ostrac, p. 40. 

 1865. Cythebe clathrata, var. nuda, Brady. Zool. Trans., vol. v, p. 377, pi. lix, 



figs. 9, 10. 



1868. — ANGULATA, Brady. Monog. Kec. Brit. Ostrac, p. 409, pi. xxvi, 



figs. 39—42. 



Carapace of the female, as seen from the side, oblong, subquadrangular, greatest 

 height over the anterior hinge and equal to more than half the length. Anterior 

 extremity broadly and somewhat obliquely rounded, traversed by numerous radiating 

 hair-like lines ; posterior subtruncate, projecting angularly in the middle, its lower half 

 produced backwards and often divided into four or five small teeth ; upper margin highest 

 over the anterior hinge, thence sloping with a slight convexity to the posterior extremity, 

 where it ends in an obtuse angle ; inferior straight or only slightly sinuated. Outline, 

 as seen from above, oblong, subhexagonal ; sides nearly parallel and more or less 

 constricted in the middle ; extremities abruptly tapered, obtuse ; margins irregularly 

 sinuous ; twice as long as broad ; hinge-line marked on the dorsal aspect by a deep, 



