O:^ A NEW CRUSTACEAN GENUS. 763 



It would \)e interesting to know whether this absolute want of 

 uniformity found among Burchell's Zebras in the Transvaal is 

 peculiar to this country, or whether it is the case throughout 

 Africa south of the Zambesi. Obviously it would be very 

 dangerous to attempt any classification from isolated museum 

 specimens obtained from the Transvaal at any rate. 



Dr. Gunning proposes, I understand, to deal more fully in 

 the forthcoming ' Annals ' of the Transvaal Museum Avith a matter 

 which I here only lightly touch upon. 



42. On Dlpteropeltis *, a Now Genus of the Crustacean 

 Order Branchiura. By W. T. Calman, D.Sc, F.Z.S.f 



[Received April 13, 1912 : Eead May 21, 1912.] 



(Plate LXXXIY.i) 



Index. 



Paa 



Structure or Morphology 763 



Ethology (Parasitism) 763 



Geographical Zoologj- 763 



Systematic ; DipteropeUis li irimdo 763 



The specimens described in this paper were presented to the 

 British Museum twenty years ago by Spencer Moore, Esq., by 

 whom they were collected in Southern Brazil. They were found 

 among a number of specimens of Dolojjs longicauda Heller bearing 

 the label " Parasite on the gills and body of the fish known 

 all up the river as ' Dorado ' from its golden colour. From 

 Corumba and neighbourhood, Matto Grosso." 



DiFTEROPELTIS HIRUNDO §. (PI. LXXXIY. figS. 1, 2.) 



Caiman, Abstract P. Z. S. 1912, p. 34 (May 28th). 



-Descrijytion offenude : — The most striking feature of the species 

 is the form of the carapace, the lateral lobes of which are drawn 

 out into narrow lanceolate wings directed backwards and ex- 

 tending far beyond the tips of the long abdominal lobes. The 

 wings are fleshy in texture, traversed by numerous branching 

 blood-channels, but without spines or other armature on the 

 under surface. 



The head is small, defined on each side from the carapace wings 



* The complete account of the new form described in this paper appears here, 

 but since the name and a preliminary diagnosis were published in the 'Abstract,' it 

 is distinguished by being underlined. — Editoe. 



t Published by permission of the Trustees of the British Museum. 



X For explanation of the Plate see p. 766. 



§ For definition of the genus see p. 766. 



