108 



Ampelisca 



lower Corners of head. Antenna 1 in 9 a little longer than peduncle of antenna 2^ 

 2^ Joint of peduncle not much longer tbau 1^*, flagellum 10-jointed, about 

 twice as long as peduncle; ultimate Joint of peduncle of antenna 2 in d much. 

 in Q a little longer than penultimate, flagellum in 9 20-Jointed, 1^2 length of 

 peduncle. Peraeopods 1 and 2, 7*^ Joint much longer (shorter, Boeck) than 

 5*^ and 6**^ combined. Peraeopod 5, 2*^ Joint longer than rest of leg, not 

 reaching end of 3^, expansion obliquely rounded, 3*^ Joint longer than 

 4th^ gth longer than 4^*^ and 5*^ combined, 7*^^ almost as long as 6*^. 

 üropod 3 with rami broad, can-ying some feathered setae on the confronted 

 edges. Telson long oval, cleft almost to the base, without dorsal spinules, 

 but with some setules on the margins. Colom* greyish, passing into 

 yellow-brown on the sides, with red or violet on sides of pleon and legs. 

 L. 7—12 mm. 



Mediterranean; North- Atlantic, North-Sea and Skagerrak (West- and South- 

 Monvay, Bohuslän). 



19. A. acinaces Stebb. 1888 A. a., T. Stebbing in: Rep. Voy. Challenger, ».29^ 

 p. 1036 1. 101, 102 I 1893 A. a., A. Della Valle in: F. Fl. Neapel, v. 20 p. 476. 



Head transversely ti'uncate. Side-plates l and 2 minutely toothed at lower 

 bind Corner, 1^* distally much widened, 4*^ with lower and hind margins 

 forming a very obtuse rounded angle (Fig. 25). Corneal lenses 4, the lower 

 pair behind the obtusely projecting lower 

 Corners of the head. Antenna 1 in o not 

 nearly reaching end of peduncle of antenna 2, 

 2* Joint about twice length of 1^*, flagellum 

 10-jointed, longer than peduncle; antenna 2 

 in 9 as long as the bod}^ ultimate Joint 

 of peduncle rather shoi-ter than penultimate, 

 which is longer than whole peduncle of an- 

 tenna 1, flagellum 34-jointed, longer than 

 peduncle. Mandibular palp with 2^ Joint 

 moderately broad, 3*^ much shorter and 



Fig. 25. A. acinaces. 

 Lat«ral view. 



Fig. 2G. A. acinaces. 

 Peraeopod 5. 



narrower. Maxiila 1 with 2 small setae on inner plate. Peraeopods 1 and 2, 

 7**^ Joint much longer than 5^^ and 6*^ combined. Peraeopod 5 (Fig. 26), 

 2"^ Joint with the expansion broad, almost transversely ti'uncate, not reaching 

 end of 3^ Joint, which is longer than 4*^; b^^ Joint a little longer than the 

 4*^ each of them being lobed in front but not deeply; 6*^^ nearly as long 

 as 3 preceding joints combined; 1^^ naiTOwly lanceolate, about '^l^ length 

 of 6*^. üropod 3, rami lanceolate, furnished with spines and setules. Telson 



