184 



POST-TERTIARY ENTOMOSTRACA. 



unusually long slender teeth ; palp three-jointed, the second joint elongated, " branchial 

 appendage having two long ciliated setae and one rudimentary." Maxillae of the usual 

 form. Feet very short ; the first two pairs three-jointed, the last pair four-jointed. 

 " Right foot of the last pair, in the male, prehensile and only three-jointed, terminal claw^ 

 very large and strong. Abdomen of the female very convex above, the postabdomiual 

 lobes bearing two short hairs." Eyes wanting. 



1. Krithe GLAciALis, nov. sjj. Plate VI, figs. 21 — 26. 



Carapace of the female, as seen from the side, subrhomboidal, almost equal in height 

 throughout, height equal to nearly two thirds of the length ; anterior extremity evenly 

 rounded ; posterior obliquely truncate ; superior margin gently arched and forming a 

 rounded obtuse angle posteriorly ; inferior convex. Outline, as seen from above, ovate, 

 widest in the middle, acutely pointed in front, rectangularly truncate behind, greatest 

 width shghtly exceeding half the length, posterior extremity slightly emarginate at each 

 side of the median line. End-view nearly circular. Carapace of the male narrower and 

 longer, dorsal and ventral margins nearly straight, infero-posteal angle more pronounced. 

 Shell-surface smooth, bearing several scattered circular papillae and a few rather 

 short thick hairs. Lucid spots large, oblong, four in a transverse row a little below 

 and in front of the centre of the valve and one or two a little in advance of the main 

 group. 



Length, -^tli of an inch. 



This species differs little from Krithe Bartonensis, except in the greater size and 

 wider proportions of the carapace, and in the rectangularly truncate posterior extremity. 

 It has not yet been seen in the recent state. 



Fossil. — Scotland : Errol. Norway. 



2. Krithe Bartonensis {Jones). Plate II, figs. 22 — 26. 



1856. Cytherideis Bartonensis, Jones. Monog. Tert. Entom., p. 50, pi. v, figs. 



2 a, 2 6, 3 a, 3 b. 



1865. Ilyobates pr^texta, G. O. Sars. Overs. Norg. mar. Ostrac, p. 60. 

 1868. — Bartonensis, Bracfy. Monog. Rec. Brit. Ostrac, p. 432, pi. xxxiv, 



figs. 11 — 14, and pi. xl, fig. 5. 



Carapace of the female, as seen from the side, oblong, highest near the middle^. 



