130 POST-TERTIARY ENTOMOSTRACA. 



the length. Lucid spots about six; usually arranged in two transverse lines, but some- 

 times (more especially in the variety tumida found by us living abundantly in the East 

 Anghan Fen District) arranged in the rosette form shown in Plate II, fig. 29, of this 

 Monograph. Such specimens often exhibit also a reticulated ornamentation on the 

 posterior portion of the shell, which is otherwise perfectly smooth and polished. 

 Length, ^bih. — j^-th of an inch. 



Distribution. Recent. — Great Britain, Ireland, Holland, Sweden, Switzerland, 

 France, Bohemia, Tyrol. 



Fossil. — England : Hornsea, Whittlesea, Branston Fen (Forfarshire, Berkshire, Cam- 

 bridgeshire, Essex ; Pleistocene, Essex, Prof. T. Rupert Jones). 



Genus 8 — Pontocypris, G. 0. Sars. 



Shell thin and fragile, higher in front than behind, elongated, usually su.breniform or 

 subtriangular. Antepenultimate joint of the lower antennae bearing a brush of about 

 five setae, the longest of which do not much overreach the apices of the terminal claws ; 

 at the base of the joint is attached a pedicillated vesicle. Second pair of jaws destitute 

 of a branchial appendage, palp large and subpediform, three-jointed ; last joint in the 

 female armed with two long, slightly curved claws. Second pair of feet fiexuous, 

 four-jointed ; last joint short and armed at the extremity with several short setse, one of 

 which is conspicuously pectinated. Post-abdominal rami well developed, bearing at the 

 apex two curved claws and a slender seta, on the inner margin three long setae. 



1. Pontocypris mytiloides {Norman). Plate XV, figs. 7, 8. 



1862. Cythere mytiloides, Norman. Ann. and Mag. N. H., vol. ix, p. 50, pi. iii, 



figs. 1—3. 

 1865. — AVENA, Norman. Nat. Hist. Trans., Northumberland and Durham, 



vol. i, p. 17. 



1863. Ctpris sekrulata, G. O. Sars. Zoologisk Reise i Sommeren, 1862, p. 58. 

 1865. Pontocypris serrulata, G. O. Sars. Oversigt af Norges marine Ostracoder, 



p. 15. 

 — — HisPiDA, G. O. Sars. Loc. cit., p. 16. 



1868. — mytiloides, Brady. Monograph of the Recent British Ostra- 



coda, p. 385, pi. xxv, figs. 26—30 ; pi. 

 xxxvii, fig. 4 ; and pi. xxxviii, fig. 1. 

 1858? Bairdia DACTYLUS and var. PUNCTATA, ^^<7er. Die Ostracoden der Miocan- 



Schichten bei Ortenburg, p. 

 7, taf. i, figs. 3, 4. 



Carapace, as seen from the side, elongated, triangular, high in front, tapering to a 



