REPORT ON THE AMPHIPODA. 13(50 



Remarks. — Since in the male specimen the first joint in the flagellum of the upper 

 antennae, though greatly elongated, is without a brush of filaments, it is probable that 

 the animal was not fully adult, and this will in part account for the great difference in 

 size between this specimen and that of the largest female. 



Phronimella elongata. Specimen E. 



Loccdity. — August and September 1875 ; Pacific Ocean ; lat. 7° 35'-5° 54' N., 

 long. 149° 49'-147° 2' W.; surface; surface temperature, 81°. Three specimens, 

 female. 



Remarks. — The second uropods consist of a conical rudiment. One of the specimens 

 presents an extraordinary spectacle, since it appears to be swarming in every part with 

 a little oval parasite, unique in this respect among all the Challenger specimens of 

 Phronimella. 



Phronimella elongata. Specimen F. 



Locality. — Station 268, August 30, 1875; between the Sandwich Islands and 

 Tahiti; lat. 7° 35' N., long. 149° 49' W.; surface temperature, 81°. Two specimens, 

 male. 



Remarks. — The upper antennae in one of these specimens are like those in the male 

 specimen from Station 230, and nearly so in the other, but the narrow termination 

 of the large first joint of the flagellum was ready to divide into smaller joints, and in 

 the lower antennae the long first joint was similarly ready for subdivision ; the second 

 uropods consisted only of a small single joint, about reaching to the base of the peduncles 

 of the third pair. 



Phronimella elongata. Specimen G. 



Length, from the front of the head to the end of the peraeon, five-twentieths of an 

 inch ; from the latter point to the extremity of the uropods, six-twentieths of an 

 inch ; the coalesced first and second segments of the peraeon are shorter than any 

 that follow ; the seventh peraeon segment is rather longer than the two preceding- 

 together ; the first segment of the pleon the longest, a little longer than the last of the 

 peraeon, shallow, with the posterodateral angle forming a tooth, above and a little 

 beyond which the hind margin is roundly angled ; the two following segments similar, 

 successively shorter. 



(ZOOL. CHALL. EXP. PART LXVII. 1888. XxX 172 



