Land, Fresh- Water, and Marine Crustacea. 163 



92. Gammarus Duebeni, Lilljeborg. 



1851. Gammarus Duebeni, Lillj., Ofvers af K. Svenska Vet. -Acad. 

 Forhandl., p. 22. 



Habitat. — Taken in the brackish water lagoon at the mouth 

 of the Cocklemill Burn, near Largo, 1896; also in brackish 

 water pools on May Island, 13th June 1893. 



93. Gammarus locust a (Linne). 



1767. Cancer locusta, Linn., Syst. Nat., ed. xii. , vol. ii. p. 1055. 

 1863. Gammarus locusta, Bate and Westw., Brit, Sessile-eyed Crust., 

 vol. i. p. 378. 



Habited . — Common, especially in the littoral zone. 



94. Gammarus pulex (De Geer). 



1752. Squilla ponce, De Geer, Mem. pour Servir a l'Hist. des 



Insects, vol. vii. p. 525, pi. 33. 

 1777. Astacus pulex, Pennant, British Zoology, vol. iv. p. 17. 



Habitat. — Common in shallow fresh- water lakes, slow 

 streams, ditches, etc., throughout the district. 



Genus (56) Melita, Leach. 



1 95. Melita obtusata (Montagu). 



1804. Cancer gammarus obtusatus, Mont., Trans. Linn. Soc, vol. ix. 



p. 5, pi. ii. fig. 7. 

 1863. Melita obtusata, Bate and Westw., vol. i. p. 407. 



Habitat. — Moderately frequent throughout the estuary. 

 96. Melita dent at a (Kroyer). 



1842. Gammarus dentatus, Kroyer, Naturh. Tidsskr. 1 R., vol. iv. 



p. 159. 

 1862. Megamcera dentata, Bate, Catal. Amphip. Brit. Mus., p. 225, 



pi. xxxix. fig. 4. 



Habitat. — Taken in moderately deep water (28 fathoms) 

 at the mouth of the estuary in January 1890 ; rare. Only 

 two specimens, one partly dissected, are in my collection. 



1 Two specimens of Melita gladiosa, Bate, were in 1888 recorded by me 

 from Largo Bay (cf. Sixth F. B. Rept., part iii. p. 247), but they were 

 probably merely well-developed males of M. obtusata. 



