404 CARL BOVALLIUS, AMPHIPODA HYPERIIDEA. I. 2. ANCHYLOMERIDtE. 



Euprimno macropus. 



twice as long as the two following together. The first joint of the flagellum is somewhat 

 longer than the whole peduncle, tumid, feebly tapering towards the apex, and sparingly 

 provided with short olfactory hairs; the following joints are short, only a little longer than 

 broad, and each is furnished with one or two minute hairs on the under margin. The 

 flagellar joints are twenty-six or twenty-eight in number. 



The second pair of antennae are much longer than the first, and in the adult male 

 reach almost to the hind margin of the second pleonal segment. The first free joint of the 

 peduncle is as long as broad, nearly globular; the glandular cone is only a little shorter 

 than the first peduncular joint; the second joint is a little longer than the first; the third 

 is somewhat shorter and narrower. The first joint of the flagellum is long and slender, 

 feebly tapering towards the apex, and a little shorter than the peduncle; the following 

 joints are cylindrical, slender, and considerably longer than broad. The flagellar joints 

 are twenty-two or twenty-three in number. 



The labrum is small and faintly bilobed. 



The mandibles (PI. XVII, fig. 26 and 27) are short but stout. The incisive lamina 

 is finely crenulated, with a large rounded prominence at the outer corner and a smaller 

 one at the inner; the secondary lamina of the left mandible is small, and is armed with 

 three teeth. The molar tubercle is large, furnished with densely set sharp-pointed teeth 

 and long bristles. The mandibular palp is comparatively short, fixed a little above the 

 middle of the stem; the first joint is very short, only a trifle longer than broad; the 

 second is more than three times as long as the first; the third is about as long as the 

 second. 



The labium is thick; the lateral lobes are provided with bristle-like hairs. 



The first pair of maxillw (PL XVII, fig. 28) have the principal lamina spoon-shaped, 

 and the margins fringed with stout spines. The secondary lamina is feebly curved, and 

 armed at the apex with six or seven sharp teeth. 



The second pair of maxillos (PI. XVII, fig. 29) are comparatively small. The prin- 

 cipal lamina is short, triangular, and armed at the apex Avith three spine-like bristles. 

 The secondary lamina is narrower, curved, sparingly fringed with long hairs, and armed 

 with a spine-like bristle at the apex. 



The maxillipeds (PI. XVII, fig. 30) have the stem almost linear. The lateral laminae 

 are narrowly lanceolate, the margins fringed with short hairs. The median lobe is obtuse 

 at the apex, and fringed with minute hairs. 



The perceon is only a little longer than the first two pleonal segments together; it 

 is not much compressed, and very deep. The first segment is fully as long as the second; 

 the seventh is the longest of all, and is dorsally produced in the median line into a sharp- 

 pointed process, which is almost half as long as the first pleonal segment in the adult 

 animal, but much shorter in the younger, and entirely wanting in the very young. 



The epimerals are distinct; they are broader than long, with the corners rounded, 

 except in that of the second pair, which has the front corner sharp-pointed. 



The branchial vesicles are attached to the second, third, fourth, fifth, and sixth pairs 

 of pemeopoda; they are fully as long as the femora of the corresponding pairs, except that 

 of the fifth pair, which is shorter than the femur. 



