REPORT ON THE AMPHIPODA. 937 



Harpinioides drepanocheir, n. sp. (PL LXXXIL). 



Rostrum minute, sub-depressed; back rounded; the first two segments of the pleon 

 with the posterolateral angles slightly rounded ; the third segment, which is the 

 longest, has the corners strongly rounded ; there are some submarginal spines on the 

 lower borders of these three segments. 



Eyes not observed. 



Upper Antenna'. — Peduncle short, the first joint longer than the next two united, 

 and much thicker than either ; the second longer and thicker than the third, which is 

 nearly equal in length to the first two joints of the flagellum united ; all the three 

 joints have on the inner side apical groups of slender divergent spines, the second has 

 also a group near the centre ; the flagellum more than twice as long as the peduncle, of 

 twenty-four joints, of which the first is the longest. Secondary flagellum one-jointed, 

 very narrow, shorter than the first joint of the primary, the truncate end tipped with 

 setules. 



Loicer Antennse shorter than the upper, but with peduncles rather longer. The 

 first three joints short, the first a little inflated, the gland-cone small, decurrent, the 

 fourth joint not equal in length to the preceding three united, the fifth a little shorter 

 and narrower than the fourth, like it having a group of small spines or seta? about at 

 the centre, and two apical groups ; the fiagellum shorter than the peduncle, of fourteen 

 joints. 



Upper Lip with the distal border broad and flat, very slightly ciliated. 



Mandibles. — The cutting plate in the left mandible with a long, nearly straight, 

 very oblique edge occupied by about thirty-five minute denticles, closely set, with their 

 points upwards, a large prominent tooth at the top, and at the lower end, which is very 

 advanced, two or three large teeth ; the secondary plate short, broad, especially at the 

 distal margin, which is oblique, with a large tooth above and another below, the 

 intermediate space showing seven little denticle-like prominences, of which the upper 

 three are close together ; spine-row of nine or ten denticulate spines accompanied by 

 cilia, the shorter spines at either end of the row, the arrangement somewhat fan -like; 

 the molar tubercle small and slender, a little ciliated, but apparently without any 

 denticulate crown ; the cutting plate of the right mandible with only twenty-six 

 denticles on the oblique edge, a prominent tooth at either end, and a third on the 

 under margin some way to the rear of the lower apex ; the secondary plate represented 

 by a small straight spine, prickly at the distal end, shorter than the spines of the 

 spine-row, which are ten in number ; of the palp, which is set slightly in advance of 

 the molar tubercle, the first joint is a little expanded distally, the second is stout, 

 narrowest at the base and apex, cariying a row of five rather large spines on the 

 inner surface, and one on the outer, near the very convex front margin ; the third 



(ZOOL. CHAT.L, EXP. — PART LXVII. — 18S7.) Xxx 118 



