South African Crustacea. 49 



Sphceroma, while in the male a notch, as in the male Dynamenella 

 (compare the diagnosis below) is observed ; the specimen described 

 by Heller is evidently a male. The female of the species seen by 

 me cannot be separated from Exosphceroma, while the structure 

 in the male alluded to is very curious. For various reasons 

 I omit this form from the conspectus, hoping to obtain more 

 material of allied species " (loc. cit. p. 102). In a further note 

 Hansen says : " The genera Exosphceroma, Isocladus, and Zuzara 

 (with Cycloidura as a synonym) are so closely allied that the females 

 can scarcely be separated, while it is easy to refer the adult males to 

 their respective genera. When more species are known it will 

 probably be necessary to unite them, preserving the name Zuzara 

 for the genus. If that be not done, it will be necessary to establish 

 a new genus for Sphceroma scabriculum (Hell.), and perhaps some 

 other species " (loc. cit. p. 103). 



GEN. SPH^ROMA, Bosc. 



1802. Sphceroma, Bosc, Hist. Nat. Crust., vol. ii., p. 182. 



1905. Sphceroma, Stebbing, Herdman's Eep. Ceylon Pearl Fisheries, 



pt. iv., Isopoda, p. 31. 

 1905. Sphceroma, Hansen, Quart. J. Microsc. Sci., vol xlix., pt. 1, 



p. 115. 



SPH.EROMA TEREBRANS, Bate. 



1866. Sphceroma terebrans, Bate, Ann. Nat. Hist., Ser. 3, vol. xvii., 

 p. 28, pi. 2, fig. 5. 



1904. Sphceroma terebrans, Stebbing, Spolia Zeylanica, vol. ii., pt. 5, 



p. 16, pi. 4. 



1905. Sphceroma terebrans, H. Richardson, Bulletin U.S. Nat. Mus., 



No. 54, p. 282. 



1905. Sphceroma terebrans, Hansen, Quart. J. Microsc. Sci., vol. xlix.,, 

 pt. 1, p. 116. 



There is a divergence of opinion between Miss Richardson and 

 myself as to the distinctness of her species S. destructor from Bate's 

 S. terebrans. Under the references given above, the arguments will 

 be found fully stated for the opposing views. Hansen offers no 

 decision. 



Two specimens not distinguishable, as it seems to me, from those 

 which Dr. Willey found in Ceylon, have been sent me from South 

 Africa. Their depredations had been carried on at Gamtoos River 

 bridge. 



4 



