150 THE VOYAGE OF H.M.S. CHALLENGER. 



Description of the Female. — None of the female specimens at my disposal were bo 

 large as either of the two male specimens described above. The body is much smoother, 

 and the sculpturing on the head and first segment of the thorax is entirely absent. In 

 place of the long spines of the male are very faintly marked projections which occupy a 

 similar position. 



The segments of the thorax are similar to those of the male and are smooth dorsally, 

 but granulated upon the epimera. 



The segments of the abdomen are somewhat differently disposed; the first segment 

 of the abdomen is similar to that of the male; the next three segments, however, form a 

 single piece mesially, but are distinctly separated laterally. The caudal shield is exactly 

 like that of the male. 



The antenna? are not quite so long as in the male, but are otherwise similar. 



The first abdominal appendage, as in other Isopoda, differs by the absence of the 

 penial filament. 



Station 161, off entrance to Port Philip, April 1, 1874; lat. 38° 22' 30" S., long. 

 144° 36' 30" E.; depth, 33 fathoms; bottom, sand. 



Station 163b, off Port Jackson, June 3, 1874 ; lat, 33° 51' 15" S., long. 151° 22' 15" 

 E; depth, 30 to 35 fathoms; bottom temperature, 63° F. ; hard ground. 



Cymodocea, Leach. 



Cymodocea darwini, Cunningham. 



Cymodona danrini, Cunningham, Trans. Linn. Soc. Loud., vol. xxvii. 



This species, first noticed by Cunningham, has been recently fully described by Studer 

 from the same locality, viz,, the shores of Patagonia. During the Challenger Expedition 

 several specimens were dredged off Kerguelen Island. This species, therefore, forms 

 another instance of those which are common to Patagonia and Kerguelen 



Station 149h, off Cumberland Bay, Kerguelen, January 29, 1874 ; depth, 127 

 fathoms ; volcanic mud. 



Cymodocea abyssorum, F. E. Beddard (PI. VII. figs. 6-12). 



Cymodocea ahyssorum, F. E. Beddard, Proc. Zool. Soc. Loud., 1SS6, pt. i. p. 114. 



This species is represented by two examples, dredged in 1070 fathoms, off New 

 Guinea. 



One of these specimens is a male and the other a female ; the male is rather 

 the larger of the two, measuring 14 mm. in length, while the female measures 11 mm.; 

 besides this difference in size the two sexes are to be distinguished by the form of the 



