ISOPODA. 57 



The specific name is given out of respect to my friend Dr. Charles Chilton, 

 whose Stenetrium fractum has a name only too suggestive of the mishaps to which 

 these delicate isopods are liable. Haswell's species is described as half-an-inch long, 

 Chilton's as about a sixth of an inch. Though it remains a little doubtful whether 

 the species here described belongs to Haswell's genus, the possibility is also open 

 that S. armatum, S. fractum, and S. chiltoni may all be the same species. 



Family : MUNNID/E. 

 Pleurocope, A. 0. Walker. 



1901, Pleurocope, Walker, ' Journ. Linn. Soc.,' London, vol. 28, p. 297. 

 Mr. Walker remarks that " this genus differs from Pleurogonium, its nearest ally, 

 in the large size and peculiar appendages of the head, the different relative 

 proportion and structure of the antenna?, in the form of the caudal segment, and in 

 the position and size of the uropods, which are unusually large for the family." It 

 may, however, be observed that in the genus Dendrotion, Sars, the uropods are 

 larger and more conspicuous than in the present genus. 



Pleurocope dasyura, Walker. 



1901, Pleurocope dasyura, Walker, 'Journ. Linn. Soc.,' vol. 28, p. 297, pi. 27, figs. 12 to 18. 



The description by Mr. A. 0. Walker, and the excellent figures by Mr. Andrew 

 Scott which accompany it, place the identification of this species beyond doubt. 

 Beyond verification I have nothing to add, except that the perreon displayed four 

 stiff upstanding dorsal setse. A point of interest would have been to ascertain the 

 character of the mandibles. But at the very moment when I was arranging the 

 specimen for dissection, it disappeared like a dream, and defied all the efforts made for 

 its re-discovery. 



The length was a little over 1 millim., therefore approximately the same as 

 Mr. Walker's type specimen from the Mediterranean. It came into my hands 

 already named by Mr. A. Scott. 



Locality : Gulf of Manaar. 



Tribe: ONISCLDEA. 



Family: LIGIID^E. 



Ligia, Fabricius. 



1798, Ligia, Fabricius, ' Supplementum Ent. Syst.,' p. 301. 

 1885, Ligia, Budde Lund, 'Isopoda Terrestria,' p. 258. 



Ligia exotica, Roux. 



1828, Ligia exotica, Eoux, 'Crust. MeVlit.,' livr. 3, pi. 18, f. 9. 

 1885, Ligia exotica, Budde Lund, 'Isopoda Terrestria,' p. 267. 



A mutilated specimen occurs in the collection, which appears with little doubt to 

 belong to this widely distributed species. 



Locality : Station XXXIX., Gallehogalle Bank, 16 to 30 fathoms 



