Land, Fresh- Water, and Marine Crustacea. 327 



Musselburgh; not very rare. Dredged also off the north- 

 west end of Inchkeith. 



124. Beatricella cemula, T. Scott. 



1893. Delavalia cemula, T. Scott, Eleventh F. B. Rept., pt. iii. 



p. 204, pi. iv. figs. 36-47. 

 1905. Beatricella cemula, T. Scott, Ann. and Mag. "Nat. Hist. (7), 



vol. xvi. p. 569 (footnote). 



Hah. — Dredged in Largo Bay, and subsequently in one or 

 two other places. 



Genus (56) Tachidius, Lilljeborg, 1853. 



125. Tachidius discipes, Giesbrecht. 



1853. Tachidius brevicornis, Lilljeborg (non Cyclops brevicornis, 



0. F. Miiller, 1776), De Crust, ex 

 ordinibus tribus, Clad. Ostrac. 

 Copep., p. 196. 



1880. ,, ,, Brady (non C. brevicornis, Miiller), 



Monograph, vol. ii. p. 20, pi. 

 xxxvii. 



1881. ,, discipes, Giesb., Die frei-leb. Copep. der Kieler 



Fohrde, p. 108, pi. ii. fig. 4; pi. iv. figs. 25, 28 

 et seq. 



Hob. — Brackish- water pools at the mouth of the Cockle- 

 mill Burn at the east end of Largo Bay, 1890. This is a 

 moderately common species in places such as that referred to. 



126. Tachidius littoralis, Poppe. 



1885. Tachidius littoralis, Poppe, Die frei-leb. Copep. des Jade- 



busens, Abhandl. d. nat. Ver. zu 

 Bremen, vol. xi. p. 167, pi. vii. figs. 

 10-20. 



1891. ,, crassicomis, T. Scott, Tenth F. B. Rept., pt. iii. 



p. 250, pi. viii. figs. 14-27. 



Hah. — Dredged near Culross, west of Queensferry, 1892; 

 not very rare. This, like T. discipes, is a brackish-water 

 species, and appears to be generally distributed where the 

 conditions are favourable. 



