124 Proceedings of the Royal Physical Society. 



Joppa in September 1887; off the east side of Inchkeith in 

 March 1892, and also in other parts of the estuary, but 

 always very sparingly. 



Genus (11) Hemimysis, G. 0. Sars, 1869. 



20. Hemimysis Lamornm (Couch). 



1856. Mysis Lamornoe, Couch, The Zoologist, p. 5286. 



Hahitat. — Collected off Bo'ness in November 1887; Largo 

 Bay, December 1888 ; and afterwards at nearly all the 

 Experimental Stations. This species, when living, is readily 

 observed by its brilliant red colour. 



Genus (12) Macropsis, G. 0. Sars, 1876. 



21. Macropsis Slahberi (Van Beneden). 



I860. Podopsis Slahberi, Yan Ben., Rech. sur la faime litt. de 



Belgique, Crust., p. 18, pi. vi. 

 1876. Macropsis Slahberi, G. 0. Sars, Middelhavets Mysider, p. 28, 

 pis. xi.-xiii. 

 Habitat. — Firth of Forth below Grangemouth, 1884, and 

 subsequently near Granton Quarry, Inchmickery, and Inch- 

 keith (Henderson). Common off Bo'ness and oft' Musselburgh, 

 but becoming gradually scarcer seaward, and rarely taken at 

 the mouth of the estuary. 



Genus (13) Macromysis, White, 1847.^ 



22. Macrortiy sis flexuo sits (0. F. Muller). 



1788. Cancer flexuosus, Mlill., Zoologia Danica, — Discript. et Hist., 



vol. ii. p. 34, pi. Ixiv. figs. 1-9. 

 1853. Macromysis chamceleon, Bell, Brit. Stalk-eyed Crust., p. 336. 



Habitat. — Common, especially inshore, off Musselburgh 

 and in the upper parts of the estuary. (See Norman, op. cit., 

 for a list of synonyms.) 



23. Macromysis inerriiis (Eathke). 



1843. Mysis inermis, Rathke, Beitr. zur Fauna Norw., p. 20. 



Habitat. — Off' Bo'ness in November 1887, and in February 



1 Cf. Stebbing on the name. of the genus in A History of Crustacea, p. 267 

 (1893). 



