278 Proceedings of the Royal Pkysical Society. 



Genus (17) Ilyocypris, Bradj^ and Norman, 1889. 



36. Ilyocypris gihha (Eamdohr). 



1808. Cypris gibbet, Ramdohr, Mag. der Gesells. uaturf. Freunde in 

 Berlin, ii. p. 91, taf. iii. figs. 13-17. 



JIah. — Union Canal, near Edinburgh, 4th September 1889. 

 I obtained a number of specimens here — the only place 

 where I have observed it within the district. The shell of 

 this species is ornamented with prominent tubercles. 



37. Ilyocypris histrigata (Jurine). 



1820. Monoculus bistrigatus, Jurine, Hist. Nat. des Monocles, 



p. 177, pi. xix. figs. 12, 13. 

 1838. Ci/pris biplicata, Koch, Deutschlands Crustaceen, H. 21 (161), 



fig. xvi. 



Hah. — Duddingston Loch, Loch Leven, etc. This species 

 is generally distributed throughout the district. I have 

 occasionally observed specimens distinctly larger than some 

 of the others, but could find no other difference sufficient to 

 permit of their separation even as a variety. 



Genus (18) Pontocypris, G. 0. Sars, 1865. 



38. Pontocypris mytiloides (iNTorman). 



1862. Cythere mytiloides^ Norman, Ann. and Mag. Nat. Hist. (3), 

 vol. ix. p. 50, j)l- iii. figs. 1-3. 



Hah. — Off Aberlady, off Musselburgh, and various other 

 parts of the Forth estuary. Living specimens are usually 

 moderately dark in colour. 



39. Pontocypris acupunctata, G. S. Brady. 



1866. Pontocypris acupunctata, Brady, Brit. Assoc. Report (1866), 



p. 209. 

 1868. ,, ,, Brady, Mou. rec. Brit. Ostrac, 



p. 386, pi. xxiv. figs. 53-56. 



Hah. — Off St Monans and one or two other places in the 

 estuary, 1890 ; rare. Living specimens are brownish in 

 colour, and the surface is minutely punctate. 



40. Pontocypris trigonella, G. 0. Sars. 



1865. Pontocyp)ris trigonella, G. 0. Sars, Oversigt af Norges mar. 

 Ostrac. , p. 16. 



Hah. — Largo Bay and other parts of the estuary, but 

 not very common. 



