REPORT ON THE AMPHIPODA. 1283 



the fifth or the fourth joint, the apical part slightly widened and spoon-shaped, edged 

 with spines, and having on the surface near the front margin a row of spines with 

 their points directed upwards, the surface being also set with lines of spinules in little 

 curved groups, which are found also near the front margins of the two preceding joints. 



Pleopods. — The peduncles broad, not so long as the rami ; the two coupling spines 

 very short, apically broad and bent, with two or three retroverted teeth ; the cleft spine 

 stout, with slender unequal arms, each having a very slight subapical dilatation ; the 

 joints of the rami broad, numbering from eleven to fourteen, the inner ramus the broader, 

 its joints generally one less in number than those of the outer ramus. 



Uropods. — The peduncles of the first pair longer than the rami, and reaching beyond 

 those of the second pair, the outer margin cut into small teeth ; the rami almost equal, 

 the outer slightly the shorter, both margins cut into teeth, those on the inner side the 

 larger, the apex acute ; the inner ramus with the outer margin cut into teeth, the lower 

 half of the outer into four or five distant teeth, the apex acute ; the peduncles of the 

 second pair a little longer than the rami ; the inner ramus the longer, armed like that 

 of the first pair, the outer ramus having its inner margin cut into teeth, and the lower 

 half of the outer ; the peduncles of the third pair broad, longer than the rami, reaching 

 much beyond the first peduncles, the edges smooth, the inner converging to near the 

 apex of the telson, and then running near together with a slight convexity ; the inner 

 ramus rather broader and longer than the outer, its outer margin and lower part of the 

 inner finely pectinate ; the outer ramus with the inner margin and lower part of the 

 outer pectinate ; the apices acute. 



The Telson shortly pear-shaped, about as broad as long, rather more than half the 

 length of the peduncles of the third uropods, the narrow apex rounded. 



Length. — The specimen, in the position figured, measured, in a straight line from the 

 front of the head to the back of the second segment of the pleon, just over one-fifth of 

 an inch. 



Locality. — "April 4, 1875; Pacific Ocean, off Volcano Island; surface." Lat. 25° 

 30' N., long. 138° 0' E. Four specimens were obtained, that from which the details are 

 drawn being of the same size as that of which the full figure is given. 



Remarks. — The specific name refers to the evident proximity of this species to 

 Vibilia peronii, Milne-Edwards, and Vibilia robusta, Bovallius. The notices hitherto 

 published of those two species, both of them found in eastern waters, do not seem to me 

 to suffice to discriminate them the one from the other. The present species is 

 distinguished from both by having the fifth and sixth segments of the pleon coalesced, 

 not free. The rami of the second and third uropods also are unequal, not equal as in 

 Vibilia robusta. 



