EEPORT ON THE AMPHIPODA. 1333 



nil inch ; in the first pair the fourth joint is a little longer than the fifth, in the 

 second and third they are as nearly as possible equal, in the fourth pair the fifth joint 

 is perhaps slightly the longer ; in the fifth pair the fifth joint is longer than the third, 

 and the third than the fourth ; branchial vesicles were observed only with the second, 

 third, and fourth pairs, those of the second being decidedly the smallest, those of the 

 fourth apparently the largest. 



Unpods. — First pair a little under eight-twentieths of an inch long to the extremity 

 of the coalesced inner branch, a little over eight-twentieths to the end of the outer 

 branch, this branch being about half the length of the peduncle ; the second pair about 

 seven-twentieths of an inch to the end of the outer branch, which as in the first pair is a 

 little lono-er than the inner. 



Length. — The specimen was not in good order and the measurement was not 

 taken before it was broken up ; the full length was probably not much over two 

 inches. 



Locality.— Station 196, October 13, 1874 ; north of Amboina ; lat. 0° 48' 30" S., 

 long. 126° 58' 30" E. ; depth, 825 fathoms; bottom, hard ground ; bottom temperature, 

 36° - 9 ; surface temperature, 83°. One specimen, male. Trawled. 



Remarks. — If, in view of the great length of the upper antennae, it be necessary 

 to separate this specimen from the others, I should propose to name it Cystisoma 

 parkinsoni, in honour of the artist, who, so far as is known, was the first to delineate 

 any species of this genus. It will be observed that in the antennae in question the basal 

 joint is shorter than in other specimens where the total length of the antennae is 

 far less. 



Cystisoma. Specimen G. 



Head measuring seventeen-twentieths of an inch on the ventral surface from the 

 front to the mouth organs ; thirteen teeth on the lateral margin, two pairs of spines 

 on the ventral surface. 



Upper Antenna? eight-tenths of an inch long, the tip broken, but probably a very 

 small piece missing. 



Third Perseopods two inches and a half in length, the fifth joint decidedly longer 

 than the fourth. 



Fifth Perseopods just over an inch in length, the fifth joint cylindrical, packed 

 with gland cells, the front margin denticulate and apically produced into a tooth or 

 process, between which and the narrowed part of the joint where the finger hinges 

 there is a concave palm ; the much curved finger touches with its tip the middle of 

 the palm. The two joints here described much resemble the corresponding joints 



