170 Proceedings of the Royal Physical Society. 



1 Genus (74) Jassa, Leach, 1813. 



122. Jassa falcata (Montagu). 



1804. Cancer (Gammarus) falcatus, Mont. , Trans. Linn. Soc.vol. ix. 

 p. 100, pi. V. figs. 1, 2. 



HaMtat— Dredged off' Musselburgh in 1888 and 1891 ; and 

 subsequently, though sparingly, in other parts of the estuary. 



123. Jassa pusilla (G. 0. Sars). 



1894. Podocerus 'pusillus, G. 0. Sars, Crustacea of Norway, vol. i. 

 p. 596, pi. ccxiii. fig. 1. 



Habitat.— 'Firih of Forth, 1887, and also in 1889, when the 

 specimens in my collection were obtained. More recently 

 it has been dredged at Station III., and at the north-west 

 end of Inchkeith on 23rd May 1901. 



2 124. Jassa Rerdmani (A. 0. Walker). 



1893. Podocerus Herdmani, A. 0. Walker, Sixth Rept. L. M. B. C, 



p. 37, fig. 13. 



1894. ,, odontonyx, G. 0. Sars, op. cit., vol. i. p. 597, 



pi. ccxiii. fig. 2. 



Habitat.— 0^ St Monans, 19th June 1893. This form, 

 which I have observed on several occasions, resembles in 

 some respects the Jassa pusilla (G. 0. Sars); and, as 

 A. 0. Walker suggests, may be only a form of it. (It is 

 probable that the species of Jassa mentioned above may 

 have to be removed to another genus.) 



125. Jassa pelagica, Leach. 



1814. Jassa pelagka, Leach, Eclin. Encyclop., vol. vii. p. 433. 

 1843. Podocerus capillatus, Rathke, Nova Acta Csesar. Leop. Cai'ol. 

 Nat. Cur., vol. xx. p. 89, pi. iv. fig. 8. 



Habitat.— ^iTih of Forth, off Musselburgh, in April 1891, 

 and very sparingly on one or two other occasions. 



^ Cf. Rev. T. R. R. Stebbiug, ' ' On the true Podocerus, and some New 

 Genera of Amphipoda," Ann. and Mag. Nat. Hist. (7), vol. iii p. 237 et seq. 

 (March 1899). Cf. also Chevreux, "Result. Camp. Scient. Albert pi' Prince 

 de Monaco," Amphipoda, Addenda, p. 165 (1900). 



-Cf. Rev. T. R. R. Stebbing, op. cit., p. 240. 



