62S OSTRACODA FROM CLACTON-ON-SEA. [vol. lxxix, 



Ilyocypris gibba (Ramdohr). 



1808. Cypris gibba Eamdohr, Magaz. Gesellsch. Naturf. Freunde zu Berlin, 

 Jahrg. ii, p. 91 & pi. iii, figs. 13, 14, 17. 



1857. Cypris gibba Eamdohr : T. E. Jones, Pal. Soc. ' Monogr. Tert. Ento- 

 mostraca ' p. 15 & pi. i, figs. 3 0.-3/; woodc. fig. 1 (p. 16). 



1874. Cypris gibba Eamdohr : Brady, Crosskey, & Robertson, Pal. Soc. 

 ' Monogr. Post-Tert. Entomostraca ' p. 127 & pi. xv, figs. 5, 6. 



1889. Cypris gibba Eamdohr: T. E. Jones, Pal. Soc. 'Monogr. Tert. 

 Entomostraca ' Suppl. p. 9. 



1889. Ilyocypris gibba (Eamdohr) : Brady & Norman, Trans. Eoy. Soc. 

 Dublin, vol. iv, pp. 107, 248 & pi. xxii, figs. 1-5. 



1900. Iliocypris c/ibba (Eamdohr) : G. W. Midler, ' Deutschlands Siisswasser- 

 Ostracoden ' p. 88 & pi. xix, figs. 7, 8, 10, 14-19 ; pi. xx, figs. 17, 18. 



Distribution. — Recent: Great Britain, Sweden, Germany, 

 Holland, Switzerland, Hungary, Russia, France. 

 Fossil. Oligocene : Middle Hamstead Beds, Isle of Wight. 

 Pliocene : Weybourn Crag. Pleistocene : Cambridgeshire 

 (Whittlesey); Kent (Reculvers) ; Essex (Clacton and 

 Grays). Post-Tertiary : Scotland (Crofthead, Dipple, and 

 Terally) ; Cambridgeshire Fens; Lincolnshire (Branston 

 Fen); Yorkshire (Hornsea); Norfolk (Mundesley and 

 Sidestrand) ; Dorset (Chesilton, Portland). 



SCOTTIA BROWNIANA (Jones). 



1857. Cypris browniana T. E. Jones, Pal. Soc. 'Monogr. Tert. Entomo- 

 straca ' p. 13 & pi. i, figs. la-lcZ. 



1889. Cypris browniana T. E. Jones, Pal. Soc. ' Monogr. Tert. Entomo- 

 straca ' Suppl. p. 9. 



1889. Scottia browniana (Jones) : Brady & Norman, Trans. Eoy. Soc. 

 Dublin, vol. iv, p. 72 &pl. ix, figs. 23, 24 ; pi. xi, figs. 19-25. 



Distribution. — Recent: Loch Fadd (Bute). 



Fossil. Uppermost Pliocene: TJnio Bed at Sidestrand (Nor- 

 folk); Pleistocene : Clacton (Essex). 



POTAMOCYPRIS TRIGONALIS (Jones). 



1857. Cytrierideis trigonalis et var. Isevis, T. E. Jones, Pal. Soc. 'Monogr. 



Tert. Entomostraca ' p. 47 & pi. ii. figs. 2 a-2 h. 

 1889. Potamocypris trigonalis et var. Isevis, T. E.Jones, Pal. Soc. 'Monogr. 



Tert. Entomostraca ' Suppl. p. 11. 



D i s t r i b u t i o n . — Recent : Pegwell Bay, Kent (probably washed 

 in from the River Stour). 

 Fossil. Pliocene : Norwich Crag, Bramerton (Norfolk) ; 

 Pleistocene: Clacton (Essex). 



A smooth form of this species (var. I a vis) was recorded by 

 T. Rupert Jones from the Weybourn Crag of East Runton 

 (Norfolk), and as occurring plentifully in the Pleistocene sand of 

 Gravs (Essex). Some of the specimens now described from 

 Clacton are smoother than the others, but in other respects they 

 agree with the typical form, 



