26 CARL BOVALLIUS, AMPHIPODA HYPERTIDRA. 



longiores; femur ante leve, post spinulose serratum, articulis tribus sequentibus multo brevius, 

 spinam curvatam, bicuspidatam, genu haud longiorem gerens; tibia carpo multo longior; 

 carpus metacarpo longior. Pedes septimi paris dimidio pedum quinti paris paullo breviores; 

 dactyli ejusdem paris pedunculati. Segmenta uri duo ultima coalita. Pedes uri angusti 

 parce serrati; rami externi elongati angusti, in tertio pari dimidium pedunculi paullo 

 superantes. Rami interni primi paris pedunculis longiores, secundi et tertii parium 

 pedunculis paullo breviores. Telson triangulare. 



The body is not keeled. The head is a little deeper than long, with two indistinct divergent 

 keels on the upper side. The first pair of antennce are a little shorter than half the body. 

 The femora of the first four pairs of pereiopoda are narrow. The fifth pair are longer 

 than the sixth; the anterior margin of the femur is smooth, the posterior spinously serrated; 

 it is much shorter than the three following joints together; the apical spine-like process is 

 bifid, curved, not longer than the genu; the tibia is much longer than the carpus; the 

 carpus is longer than the metacarpus. The seventh pair are a little shorter than half the 

 length of the fifth pair; the dactyli of the seventh pair are pedunculated. The last two 

 ural segments are coalesced. The uropoda are narrow, sparingly serrated, the exterior 

 rami long, narrow; those of the third pair a little longer than half the peduncles. The 

 interior rami of the first pair are longer than the peduncles; those of the second and 

 third pairs are a little shorter than the peduncles. The telson is triangular. 



Colour. White with red spots on the legs. 



Length. 5,5 mm., without antenna? 4 mm. 



Hab. The Pacific, at Corinto, Nicaragua. Captured by the author in 1882. (S. M.). 



Syn. 1887. Tyro pncijira, C. BOVALLIUS. "Systematical list of the Amphipoda Hyperiidea». Bih. t. K. 



Sv. Vet. Ak. Handl. Bd. 11. N:o 16, p. 4. 



This species is very closely allied to Tyro Tullbergi, and ought perhaps to be regarded 

 only as a variety of it; however there being many, if not very important, differences, I give it 

 preliminarily, though with some hesitation, as a species of its own. Only the female is known. 



The body is smooth and even, not keeled or marginated. 



The head is truncated anteriorly. 



The flagellum of the first pair of antenna' is two-jointed, five times longer than the 

 peduncle. 



The pereion is not marginated; the second pereional segment is as long as the first. 

 The last three segments are almost as long as the three preceding together. 



The carpi of the first tiro pairs of pereiopoda (PI. Ill, fig. 11) are longer than the carpi. 



The third and fourth pairs (PI. Ill, fig. 12) with the tibias as long as the carpi. 



The femur of the fifth pair (PL III, fig. 13) has the apical process bifid, the anterior 

 spine is much shorter and more slender than the posterior; the carpus is dilated and a 

 little tumid; the dactylus scarcely a fourth of the metacarpus. 



The sixth pair (PI. Ill, fig. 14) with the carpus and the metacarpus a little tumid. 



The seventh pair (PI. Ill, fig. 15) are quite as long as the femur of the fifth pair; 

 the tibia and the carpus are a little tumid; the metacarpus is shorter than the carpus. 

 The dactylus as in the preceding species (PL III, fig. 16). 



