PARADOXOSTOMA. 



213 



and without a branchial appendage. Terminal lobes of the first pair of jaws very 

 narrow; branchial plate elongate-ovate, and bearing at the base two deflexed setae. 

 Feet short and robust, last joint elongated, terminal claw very short and curved ; basal 

 joint of the first pair armed at the apex with a single strong spine. Postabdominal lobes 

 bearing two short hairs. One eye. 



1. Paradoxostoma variabile {Baird). Plate X, figs. 29 — 32. 



1792. ? Cythere flavida, M'dller. Entomostraca, p. 66, pi. vii, figs. 5, 6. 

 1835. — VARIABILIS, Baird. Trans. Berwickshire Nat. Club, vol. i, p. 98, 



pi. iii, figs. 7 a — b ; vol. ii, p. 153; (1850) 

 Brit. Entom., p. 170, pi. xxi, figs. 10, 11. 

 1865. Paradoxostoma variabile, Sars. Overs. Norg. mar. Ostrac, p. 93. 

 1868. — — Brady. Monog. Rec. Brit. Ostrac, p. 457, pi. 



XXXV, figs. 1 — 7, 12 — 17 ; pi. xli, 

 fig. 8. 



Carapace, as seen from the side, pear-shaped, much higher behind than in front ; 

 greatest height equal to half the length, situated behind the middle ; anterior extremity 

 narrowly, posterior broadly rounded ; superior margin well arched, sloping more steeply 

 in front than behind ; inferior convex behind the middle. Outline, as seen from above, 

 compressed, ovate, tapering gradually to the acuminate extremities ; greatest width 

 behind the middle, slightly exceeding one third of the length. End-view obovate, 

 widest above the middle. Shell-surface perfectly smooth. 

 Length, ^th of an inch. 



We do not remember to have seen any fossil shells of this species marked with the 

 dark-coloured maculae, which are so constant in recent littoral examples. This may 

 arise either from their having inhabited water of considerable depth or possibly from loss 

 of the original colouring during the ages which have elapsed since their death. 



Distribution. Recent. — Baffin's Bay, Spitzbergen, Great Britain, Norway, 

 Holland. 



Fossil. — Scotland : Tangy Burn, Duntroon, Loch Gilp, Blackburn, Kyles of Bute, 

 Cumbrae, Dumbarton, Cartsdyke, Paisley, Govan, West Tarbert, Raised Beach at Oban. 

 Ireland -. Woodburn, Belfast New Docks. Norway and Canada. 



