144 



POST-TERTIARY ENTOMOSTRACA. 



lana, which differs from porcellanea chiefly in its straighter and more attenuated outline 

 and more rugose sculpture. 



3. Cythere Macallana, Bradi/ and Robertson. Plate XTII, figs. 1, 2. 



1869. Cythere macallana, B. & R. Ann. and Mag. Nat. Hist., ser. 4, vol. iii, 



p. 368, pi. xix, figs. 5 — 9. 

 1869. — PKOPiNQUA, G. O. Sars. Undersogelser over Christianiafjordens 



Dybvandsfauna, p. 57, and note, p. 58. 



Carapace of the female, seen from the side, subreniform ; greatest height situated in 

 front of the middle, and equal to half the length ; anterior extremity evenly, posterior 

 obliquely rounded ; superior margin well arched, highest over the eyes, in front of 

 which it is slightly excavated, ending posteriorly in an obtuse angle ; inferior sinuated in 

 the middle. Seen from above, ovate, widest in the middle, rounded behind, subacuminate 

 in front; width less than the height. Surface of the shell vaguely and distantly punctate, 

 the ventral surface more or less marked with sinuous grooves. Colour yellowish-brown. 

 The shell of the male is longer and narrower, more tapering (as seen laterally) towards 

 the posterior extremity, and has the dorsal margin almost straight ; seen from above, the 

 sides are sul)parallel, and the posterior extremity obtuse ; the shell-surface is usually less 

 sparingly punctate than in the female. 

 Length, -(j^th of an inch. 



Distribution. Becent. — Great Britain, Ireland. 



Fossil. — Scotland : Kilchattan, Cumbrae. 



4. Cythere porcellanea, Brady. Plate XIII, figs. 3 — 5. 



1869. Cythere porcellanea, Brady. Ann. and Mag. Nat. Hist., ser. 4, vol. iii, 



p. 47, pi. vii, figs. 1 — 4. 

 1869. — — B. & B. Ibid., ser. 4, vol. iii, p. 367, pi. xix, 



figs. I — 4. 



Carapace of the female, as seen from the side, reniform ; greatest height situated in 

 the middle and equal to half the length ; anterior extremity rounded, posterior rotundo- 

 truncate, ol)scurely angulated above ; superior margin arched, sloping almost in a right 

 line behind the middle ; inferior deeply sinuated in the middle. Seen from above, ovate, 

 widest in the middle, width considerably less than the height ; acuminate in front, sub- 

 acuminate behind : surface of the shell pohshed, quite smooth, or more or less marked 



