REPORT ON THE AMPHIPODA. 1371 



fourth the largest tooth the seventh ; the difference in length between the first joint of 

 the fourth perseopods and that of the fifth is scarcely perceptible ; the angle above the 

 postero-lateraJ tooth in the first three segmeuts of the pleon is very little rounded ; in 

 the smaller specimen with the marsupial plates not fully developed, the third peraeopod 

 on one side of the animal had two teeth to the second joint, four to the third, and the 

 large tooth of the fourth joint fourth in order, followed by four on the palmar margin ; 

 the third perteopod on the other side had three teeth to the second joint, three to the 

 third, and the large tooth of the fourth joint fifth in order, with the palm as in the other 

 limb ; in the first three segments of the pleon the postero-lateral tooth had above it a 

 very decided tooth instead of a more or less rounded angle of the upper margin ; no 

 second uropods could be seen in either specimen. 



Pkronimella elongata. Specimen I. 



Locality. — Station 108, August 27, 1873 ; off St. Paul's Rocks ; lat. 1° 10' N., 

 long. 28° 23' W.; surface ; surface temperature, 78°. Eleven specimens, all female. 



Remark. — No trace of second uropods could be seen in any oue ; there were varia- 

 tions in the number of teeth on the joints of the third perseopods, and in the shape of the 

 hind margin of the first three pleon-segments. 



Phronimella elongata. Specimen J. 



Locality.— Station 106, August 25, 1873; Mid Atlantic; lat. 1° 47' N., long. 

 24° 26' W.j surface to 40 fathoms; surface temperature, 78°'8. Thirty specimens, 

 twenty-one females, nine males. 



Remarks. — One of the male specimens in some respects, and especially as to the 

 antennae, agreed closely with that described from south of Mindanao ; the upper antennae 

 had fourteen joints remaining of the slender part of the flagellum, probably within one 

 of the full number, since the last was very thin ; the upper antennas were as long as the 

 lower ; the third peraeopods had two teeth on the third joint of one limb, and three teeth 

 on that of the other ; the second uropods were reduced to a minute rudiment. Other 

 specimens were similar, with variations as to the number of teeth ; in other specimens 

 again, the male agreed as to antennae and pleopods with the specimen from Station 230, 

 but with the second uropods a mere rudiment, this being the case with all the male 

 specimens, whde the females agreed in having no trace of the second uropods. 



The following table will show the range of the genus Phronimella as illustrated by 

 the Challenger specimens :— 



