370 KEY. T. B. K. STEBBING ON NEW SPECIES OF AMPHIPODOUS 



The first and second peraeopods have the second joint decidedly broader and longer 

 than the fourth, which exceeds the fifth in length and is subequal to the sixth. The 

 finger is slender, curved, fully half as long as the preceding joint. 



The third and fourth peraeopods have the second, fourth, and sixth joints longer 

 than in the two preceding pairs ; they also have rather large oval branchial vesicles, 

 of which no trace could be detected on the preceding limbs. 



The fifth peraeopods are extremely minute, with the upper part only a little more 

 dilated than the hand, of which the articulation is very indistinct. The finger has 

 the usual broad base and slender hook. 



The pleopods have the branches three-jointed. 



The uropods are comparatively broad. The peduncles of the first pair are between 

 two and three times as long as the branches, reaching beyond the telson, and are 

 minutely denticulate on the inner margin ; the branches are subequal, more or less 

 strongly denticulate on both margins. The peduncles of the second pair extend but 

 little beyond the base of the telson, and the coalesced inner branch does not reach its 

 apex ; the outer branch is more than half as long as the inner ; both have denticu,- 

 lations on the distal halves of both margins. The peduncles of the third pair extend 

 a little beyond those of the first; the coalesced inner branch is about as much 

 longer as the free outer branch is shorter than the branches of the first pair ; both are 

 denticulate on the distal part of both margins. 



The specimen was a quarter of an inch in length from tip of rostrum to the extremity 

 of the uropods. 



Habitat. Atlantic, near lat. 0° 19' 2" S., long. 7° 19' E. It was taken February 2, 

 1886, at 8.45 p.m., near the surface. 



The sp( cific name, irom ^payjx^, short, and Te\uc, end, refers to the shortness of 

 the telson. 



EXPLANATION OF THE PLATES. 



PLATE LI. 



Scina acanthodes (p. 352). 



The full figure in dorsal view slightly inclined to the left, the line above it indicating 

 the actual length of the specimen. 



C. Dorsal view of cephalon and perseon. 

 PL Dorsal view of pleon. 

 a.s., a.i. Upper and lower antennae, 

 wi., mxA, mxp. Mandible, first maxilla, maxilliped, in situ. 



in. Mandible, separated from the other mouth-organs. 

 X. A doubtful portion of the oral apparatus. 



