GAMMARUS LOCUSTA. 
379 
Hist. 2 ser. xix. p. 144. Cat. Amph. Brit. 
* Mus. p. 266, pi. xxxvi. fig. 6. Zaddach, 
Syn. Crust. Pruss. Prod. p. 4. Liljeborg, 
Kongl. Vet. Akad. Handl. 1853, p. 448. 
Ofvers. af Kongl. Vet. Akad. Forhandl. 1852, 
p. 9. Burgersdyck, Annot. de quil Crust, 
p. 18. Bruzelius, Skand. Amph. Gramm, 
p. 52. Van Beneden, Reckerckes sur la 
Faune lit. de Belgique. Crustaces, p. 144. 
Oammarus Duebenii. Liljeborg, Ofvers. af Kongl. Vet. Akad. For- 
handl. 1851, p. 22. 
Gammarus mutatus. Liljeborg, Kongl. Vetensk. Akad. Handl. 
1853, p. 448. 
In this species the three anterior segments of the tail 
have the infero-posterior angle produced to a point. 
The eyes are of a long reniform shape, and are white in 
colour. The antennae have the peduncles strongly 
hirsute. The superior antennae are nearly half the 
length of the animal, and terminate in a very slender 
flagellum; the secondary appendage is about one-third 
the length of the primary ; in full-grown specimens it 
consists of nine, but in younger individuals of only four 
or five articuli. The inferior antennae are rather more 
robust than the superior, and about one-fourth shorter ; 
the flagellum has but few articuli. The hands are 
small, nearly of one size, and furnished with several 
fasciculi of hairs ; the palm of the second pair is more 
oblique than the first. The first two pairs of walking 
legs are short, the last three are unequal in size, the 
middle being the longest. The first three segments of 
the tail have the posterior margin unarmed, whilst 
the last three are respectively furnished with three 
fasciculi of spines, the lateral ones having about six 
spines in each. The last pair of caudal appendages have 
the branches subfoliaceous, and nearly of one length, 
the inner one sometimes one-fourth or one-third smaller 
than the outer one ; both are fringed with bundles of 
