REPORT ON THE AMPHIPODA. 1455 



elongate, with the apices more acute, as is also the case with the fourth joint, the 

 marginal armature of the whole limb being stronger ; also in the fifth peraopods the 

 first joint is more dilated ; the inner ramus of the pleopods has six, the outer seven, 

 joints ; the length of the specimen in a slightly curved position was one-fifth of an inch. 



Phorcorrhaphis edwardsi, n. sp. (PI. CLXXXL). 



First segment of the person as long as the two following together ; postero -lateral 

 angles of the first pleon-segment squared, of the two following segments obtuse. 



Eyes occupying the sides of the head. 



Upper A ntennse similar to those of Phorocorrhaphis zamboangag, but of the three 

 subterminal joints of the flagellum the first is the longest ; the large first joint of the 

 tlagellum has a great brush of filaments. 



Lower Antennas minute as in the species just mentioned, the terminal joint of the 

 peduncle longer than the two preceding together, and also longer than the two-jointed 

 flagellum. 



Mouth Organs very minute, not made out with sufficient distinctness for description; 

 the general character, as might be expected, the same as in the preceding species. 



First Gnathopocls. — First joint elongate, oval, as long as the four following- 

 together, gland-cells large ; the second joint a little longer than broad ; the third a little 

 longer than the second, with oblique distal margin ; the wrist longer than the third joint, 

 a bttle shorter than the hand, which is straight, with the margins very slightly convex ; 

 the finger curved, half the length of the hand, or rather more. 



Second Gnathopods. — All the joints longer than in the first gnathopods, the first 

 joint more slender, longer than the four following joints together ; the wrist and hand 

 each a little longer than the third joint ; the finger almost straight, very slender, 

 tipped with a slender nail, and with this as long as the hand. 



First Perseopods longer and much stouter than the gnathopods, the margins almost 

 entirely smooth. The first joint not much longer than that of the second gnathopods, 

 the second longer than broad, the third longer than the fourth, subequal in length to 

 the slightly curved fifth ; the finger about half the length of the fifth joint, bent. 



Second Perseopods like the first, but with most of the joints longer ; the bent finger 

 not half the length of the fifth joint. 



Third Perseopods. — Branchial vesicles shorter than the first joint, narrow at the 

 neck, widened below, with an indent in the lower margin. The limb similar to that of 

 Phorcorrhaphis zamboangw, the first joint rather more widened near the base, with 

 four or five little indents along the front margin, the third joint considerably longer 

 than the first, the fifth longer than the third and much longer than the fourth. Jn one 

 specimen, mounted in Canada balsam during the voyage, one of the extremely fragile 



