Land, Fresh- Water, and Marine Crustacea. 179 



G-ranton Quarry, 1st September 1900 (Dr and Miss Sprague). 

 I find this species exceedingly variable, especially in the 

 form of the head, which in the more typical specimens is 

 strongly crested, but passing by minute gradations to others 

 that have no crest at all, but having the head evenly rounded. 

 I am inclined to agree with those who regard this Daphnia 

 and the two immediately preceding as forms of one and the 

 same species, to which Daphnia jardinii, Baird, must also be 

 ascribed. In that case, Baird's name, being the older, would 

 take precedence of the others. 



Genus (6) Scapholeberis, Schoedler, 1858. 



10. Scapholeberis mucronata (0. F. Muller). 



1785. Daphne mucronata, 0. F. Muller, Entomostraca, p. 94, pi. xiii. 

 figs. 6, 7. 



Habitat. — Baith Lake, Kirkcaldy, frequent, 1890; Bavel- 

 ston Cottage Quarry, Midlothian, July 1900 (Dr and Miss 

 Sprague). 



Genus (7) Simosa, Norman, 1903. 

 (Syn. — Simocephalus, Schoedler, 1858, preoccupied.) 



11. Simosa vetula (O. F. Muller). 



1776. Daphne vetula, O. F. Muller, Zool. Dan. Prod., p. 199, 



No. 2399. 

 1858. Simocephalus vetulus, E. Schoedler, Jahresber. iiber die Louisen- 



stadtische Realschule, p. 18. 



Habitat. — Duddingston Loch ; Loch Leven ; Lochgelly and 

 Kilconquhar Lochs, Fifeshire; Loch Coulter, Stirlingshire, 

 etc.; frequent and generally distributed. 



Genus (8) Ceriodaphnia, Dana, 1853. 



12. Ceriodaphnia reticulata (Jurine). 



1820. Monoculus reticulatus, Jurine, Nat. Hist, des Monoc, p. 139, 

 taf. 14, figs. 3, 4. 



Habitat. — Baith Lake, Kirkcaldy, frequent, 1890. Upper 

 Elf Loch, Edinburgh, 1896 and 1897. In the same loch in 

 September 1900 by Dr and Miss Sprague. 



